Multi Threading in EJB by sending requests to JDBC or JMS queue
Hi,
I know that multi-threading is not permitted on EJB, but I'm planning an application which has to send a copule of requests to another system in parallel. So the EJB should be talking to any number of other systems at one time.
In an application I would simply create some threads, and that's it. With EJB this is not possible, so I've come up with the following idea:
A Queuing system will be implemented. This can be a simple table in a database or a message bean (JMS-Java Message Service). In both cases request objects have to be serialized into byte streams and stored as a Binary Object (e.g. Oracle BLOB) in the database or attach somehow to the JMS message.
Some sort of queue processor looks at the queue, deserializes the requests, does something and sends back a response (again by serialization and through db or jms).
Technically the db solution should work, I've been doing ths (de)serialization of java objects into an oracle blob, and it works. Creating a process which scans a database should also work, and with timestamps I can implement a queue.
With JMS I'm not that sure, mainly because I'm not familiar with it :-). But as far as I know some JMS vendors (I do not remember who) are using database for messaging anyway.
Any comments ?
Thanks
As I understand JMS, the database is used for persistence of messages before they are acknowledged.
If persistence is turned on, once a message arrives on the queue, the message object is serialized and stored in the database with an appropriate primary key.
When the consumer calls the receive() method the Message Object is sent to the consumer, when this acknowledged the corresponding entry is removed from the database.
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Edited by: 887737 on Jun 28, 2012 9:47 PM887737 wrote:
Hi EJP,
This is the Exception I got when I ran the java class directly from Jdeveloper. Can't I run the standalone class directly from Jdeveloper to insert the message into remote queue?
Exception in thread "main" javax.naming.NoInitialContextException: Need to specify class name in environment or system property, or as an applet parameter, or in an application resource file: java.naming.factory.initial
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at javax.naming.InitialContext.getURLOrDefaultInitCtx(InitialContext.java:325)
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at javamail.MessageEnqueue.messageEnqueue(MessageEnqueue.java:30)
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> using a container managed transactions can we achieve sending a message to the JMS
> queue and updating DB as part of single transaction with the data base driver not
> supporting XA. If yes what all configurations setting I need to do. I tried to achieve
> this using 2PC but I am getting the error that "javax.transaction.xa.XAException:
> JDBC driver does not support XA, hence cannot be a participant in two-phase commit.
> To force this participation, set the enableTwoPhaseCommit property on the corresponding
> JDBCTxDataSourceproperty, to true. Pool = ejbPool".
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How the vision connector framework works
The connector interacts with an SAP application using connector modules. The connector modules make calls to SAP's Native Interfaces and pass data (business object or event data) to and from an SAP application. The connector's flexible design enables different modules to be used for different tasks such as initializing the connector with the SAP application or passing business object data.
Communication between the connector and an SAP application
The connector uses SAP's Remote Function Call (RFC) library to communicate with an SAP application. SAP's RFC API allows external programs to call ABAP function modules within an SAP application.
Processing business objects
The connector is metadata driven. Metadata, in the WebSphere business integration system, is application-specific data that is stored in business objects and that assists a connector module in its interaction with the application. A metadata-driven connector module handles each business object that it supports based on metadata encoded in the business object definition rather than on instructions hard-coded in the connector module.
Business object metadata includes the structure of a business object, the settings of its attribute properties, and the content of its application-specific information. Because connector modules are metadata driven, they can handle new or modified business objects without requiring modifications to the connector-module code.
The vision connector framework uses the value of the verb application-specific information in the top-level business object to call the appropriate connector module to process the business object. The verb application-specific information provides the classname of the connector module.
The verb application-specific information of most top-level business objects must identify the classname of the connector module. The syntax of this verb application-specific information is:
AppSpecificInfo = PartialPackageName.ClassName,
For example,
AppSpecificInfo = sap.sapextensionmodule.VSapBOHandler,
In this example, sap.sapextensionmodule is the partial package name, and VSapBOHandler is the classname. The full package name includes the com.crossworlds.connectors prefix, which the WebSphere business integration system adds to the name automatically. In other words, the full text of the example is:
com.crossworlds.connectors.sap.sapextensionmodule.VSapBOHandler
Note:
The verb application-specific information of most top-level business objects must use a comma (,) delimiter after the connector classname. However, the Server verb, which is used by the RFC Server Module, is delimited instead by a semi-colon (;). For information about the Server verb, see How the RFC Server Module works and Supported verbs.
You need not specify the package name and classname for the verb application-specific information if the business object is used:
by the ALE Module to process application events; however, when you use the ALE Module to process service call requests, you must specify the package name and classname
by the ABAP Extension Module, which uses the default business object handler (sap.sapextensionmodule.VSapBOHandler)
Important:
Customer-generated connector modules that process business objects for the RFC Server Module must specify a full package name, which must begin with bapi. For example, bapi.client.Bapi_customer_getdetail2. The full package name in this example is bapi.client, and the classname is Bapi_customer_getdetail2.
Most business object processing is specific to each connector module. By default the connector uses the ABAP Extension Module. For more information on business object processing for the ABAP Extension Module, see Installing and customizing the ABAP Extension Module and Business object data routing to ABAP handlers. .
For more information on specifying verb application-specific information for the ALE Module, see Event processing and Processing multiple IDocs with a wrapper business object.
Processing multiple concurrent interactions
The Adapter Framework can create separate threads for processing an application event and a business object request. When processing multiple requests from the integration broker, it can create multiple threads to handle multiple business object requests. For example, when InterChange Server is the integration broker, the connector can receive multiple business object requests from multiple collaborations or from a multi-threaded collaboration.
Figure 4 illustrates the multi-threading architecture.
Figure 4. Multi-Threading Architecture of the Connector for SAP
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The Adapter Framework creates a single dedicated thread to handle poll calls. This thread calls the pollForEvents() method of the vision connector framework at the frequency specified in the PollFrequency configuration property.
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If the connector's MaxNumberOfConnections configuration property evaluates to a number greater than 1, the vision connector framework dedicates a connection to SAP for polling. If MaxNumberOfConnections evaluates to 1, event and service-call request processing share a single connection to SAP.
The polling thread dies only when the connector shuts down.
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If the connector's MaxNumberOfConnections configuration property evaluates to a number greater than 1, the vision connector framework dedicates one connection to SAP for polling and allocates the remaining connections to a pool used only for request processing.
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If the connector's MaxNumberOfConnections configuration property evaluates to a number greater than 1, the Vision business object handler checks the vision connector framework's connection pool to determine if a connection handle is available.
If the handle is available, the thread sends the request to SAP, which uses a dialog process to handle the request.
If the handle is not available, the thread waits until one becomes available. Thread sequencing determines the order in which each business object handler thread claims or waits for an available connection handle.
If the connector's MaxNumberOfConnections configuration property evaluates to 1, the Vision business object handler shares a connection with event processing.
SAP releases the dialog process after it completes processing and sends a return code.
The connector releases the connection handle after it receives the return code from SAP.
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Use the MaxNumberOfConnections configuration property to specify the maximum number of connection handles available. The number of connections cannot exceed the number of dialog processes.
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Important:
Before setting a value for MaxNumberOfConnections, contact your SAP BASIS administrator to determine an appropriate value to maximize throughput without negatively affecting performance on the application server.
Support for multiple connections
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<b>
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Multi-threaded performance server using 2 ports to two-way communication
Hi, I'm new in the forums so welcome everyone. I'm developing now an online computer game based on orginal Polish board-game, but it doesn't mean. Important is that I need to develope a high-performance multi-threaded server, which can serve... let's say few hundres of games, and a thousend of players simulateously. My server works on two ports/sockets.
First one is represented by "ServerSocketChannel clientConSsc" in my code. The main thread in my server class which invokes the method "run()" (which You can see below), registers clientConSsc with Selector and then repeatingly accepts incoming connections from clients on this socket. When connection(channel) is estabilished and clients wants to write some request to this channel, the main thread on server creates a new instance of class "RequestHandler" which extends Thread and handles this request (reads the request from channel, makes some changes on server, spreads some new messages to other clients in the same game and so on... everything on the same socket/port/channel). Then the channel/connection is closed by the server - I call such connections: "a short connections". In the same time the main thread continues the loop and is still able to accept connections from another players. That's the idea of multi-threaded server, right? :) And to this point, everything works fine, but... what if the server wants to trigger some new command, write new information to client?
Server could have tried to open a SocketChannel to client's IP address, but then the client programme would have to create and ServerSocketChannel object, bind it to some InetAddress and then... and then client becomes a server! - that breaks the idea of client-server cooperation and demands on players of my game to have routed some port on their machines. To resolve this problem I made some sort of "system" which, when some player/client is logging into my server, accepts second (this time constant, not "short") connection on the second port I mentoined on the beginning. This connection is held in variable "SocketChannel serverCon" of class "Player" - which reflects a player logged onto server. Server maintains every such connection till the client logs off. After the connection is accepted, the player whom connection it was is added to collection called "playersToRegisterToWrite". After the Selector.selectNow() is invoked (as You can see in the code below), each and every player's connection is registered in selector (with selection key - OP_WRITE and attachment pointing on owning player). In the same time client's code is trying to read some bytes from this connection and blocks on it until some bytes are written to this connection. When server wants to "tell" something to client, deliver some message/command, it creates a new instance of class which extends an abstract class called "ServerAction" (another new thread) and adds it to collection "actionsToDo". In ServerAction's method "run()" there are whole code to interact with client (e.g. send an update of players' list, an update of games' list, a chat message). Finnaly when Selector informs the server that some connection is writable (some client is waiting for commands), then server checks if there's any "actionToDo" involving this client/player. If there is, it unregisters the connection from Selector (so no other ServerAction (thread) can write on this connection) and starts the action. At the end of every "run()" method of subclass of ServerAction there's a code, which again adds the player to collection "playersToRegisterToWrite", so the player's connection can again be registered in Selector and the player can again receive informations from server - after it consumed THIS "ServerAction".
It looks to me like it should be working fine, but it's not. When I test my server and clients on the same machine (no ping/latency) everything seems to be working fine. But when it comes to play my game with somebody even on LAN or through the Internet there comes the problems. My first socket I describe (and first type of connections - short connections) works perfectly fine, so the requests triggered by client are delivered and handled properly. But the second socket is cirppling. For example: the server triggers a command refering to an update of clients logged to server' list. It is triggered by Selector so the client should be ready to read data from server, so the server sends data! And the client never receives it... Why?
It experimented a whole lot of time on SocketChannel's method "configureBlocking(boolean)", but it never helps. I think the client should always block it's listening thread on connection, contratry to server which is ment to be fast, so it should send the data through non-blocking channels. Am I right? Are there any rules refering blocking configuration of SocketChannels?
I will be grateful for every answer. To help You out I attach also drafts from run()'s methods of my classes.
Server's main method - main thread :
public void run() {
try {
selector = Selector.open();
clientConSsc.configureBlocking(false);
clientConSsc.register(selector , SelectionKey.OP_ACCEPT);
while(serverRunning) {
try {
selector.selectNow();
Iterator it;
synchronized(playersToRegisterToWrite) {
it = playersToRegisterToWrite.iterator();
while(it.hasNext()) {
Player player = (Player)it.next();
it.remove();
player.serverCon.configureBlocking(false);
player.serverCon.register(selector , SelectionKey.OP_WRITE , player);
Set keys = selector.selectedKeys() {
it = keys.iterator();
while(it.hasNext()) {
SelectionKey key = (SelectionKey)it.next();
if(key.isAcceptable()) {
it.remove();
clientCon = clientConSsc.accept();
clientCon.configureBlocking(false);
clientCon.register(selector , SelectionKey.OP_READ);
continue;
if(key.isReadable()) {
it.remove();
key.cancel();
new RequestHandler(this , (SocketChannel)key.channel()).start();
continue;
if(key.isWritable()) {
if(key.attachment() != null ) {
ServerAction action = null;
synchronized(actionsToDo) {
Iterator aIt = actionsToDo.iterator();
while(aIt.hasNext()) {
ServerAction temp = (ServerAction)aIt.next();
if(temp.getPlayer().equals((Player)key.attachment())) {
action = temp;
aIt.remove();
break;
if(action != null) {
key.channel().configureBlocking(false);
it.remove();
key.cancel();
action.start();
continue;
} catch(Exception e) {
statusArea.append(e.toString() + "\n");
e.printStackTrace();
continue;
} catch(ClosedChannelException e) {
statusArea.append(e.toString() + "\n");
} catch(IOException e) {
statusArea.append(e.toString() + "\n");
A part of server's RequestHandler's class' method run() - the method which handles requests triggered by client on first port:
public void run() {
boolean served = false;
try {
channel.configureBlocking(true);
retryCount++;
retry = false;
String command = ns.readText(channel).trim();
ns.statusArea.append("ktos przesyla komende: " + command + "\n");
if(command != null && !command.equals("ERROR")) {
String[] cmd = command.split("�");
ns.statusArea.append("komenda: " + cmd[0] + "\n");
if(cmd[0].equals("CHAT")) {
if(cmd.length != 5) {
retry();
} else {
if(cmd[2].equals("NOGAME")) { // jezeli nie ma okreslonej gry czyli rozsylamy do wszystkich
for(int i = 0 ; i < ns.loggedPlayersListItems.size() ; i++) {
Player current = (Player)ns.loggedPlayersListItems.get(i);
if(current.state == Player.CHOOSING && !current.equals(new Player(Integer.parseInt(cmd[1])))) // jezeli gracz jest w okienku wybierania gry to wysylamy mu broadcast
ns.actionsToDo.add(new SendMsg(ns , current , "CHAT�" + cmd[1] + "�" + cmd[3] + "�" + cmd[4]));
} else {
Game game = (Game)ns.gamesListItems.get(ns.gamesListItems.indexOf(new Game(Integer.parseInt(cmd[2]))));
for(int i = 0 ; i < game.players.size() ; i++) {
Player current = (Player)game.players.get(i);
if(!current.equals(new Player(Integer.parseInt(cmd[1]))))
ns.actionsToDo.add(new SendMsg(ns , current , "CHAT�" + cmd[1] + "�" + cmd[3] + "�" + cmd[4]));
served = true;
} else if(cmd[0].equals("GETGAMEINFO")) {
if(cmd.length != 3)
retry();
else {
int gameID = Integer.parseInt(cmd[2]);
ns.statusArea.append("poproszono o informacje o grze nr: " + gameID + "\n");
Game checkedGame = new Game(gameID);
if(ns.gamesListItems.contains(checkedGame)) {
Game game = (Game)ns.gamesListItems.get(ns.gamesListItems.indexOf(checkedGame));
channel.configureBlocking(true);
ObjectOutputStream oos = new ObjectOutputStream(channel.socket().getOutputStream());
oos.writeObject(game);
oos.writeObject(game.players);
oos.flush();
ns.statusArea.append("wyslano informacje o grze nr: " + gameID + "\n");
} else {
ns.statusArea.append("brak gry o nr: " + gameID + "\n");
served = true;
} catch(IOException e) {
e.printStackTrace();
if(!served) {
ns.findAndDisconnectPlayer(channel);
try {
channel.close();
} catch(IOException e) {
e.printStackTrace();
}An example of ServerAction's subclass - the class which triggers server commands to client on second port:
class UpdateLoggedPlayersList extends ServerAction {
public UpdateLoggedPlayersList(NeuroServer ns , Player player) {
super(ns , player);
public void run() {
try {
serverCon.configureBlocking(true);
ns.sendText("UPDATELOGGEDPLAYERSLIST" , serverCon);
if(ns.readText(serverCon).equals("OK")) {
ObjectOutputStream oos = new ObjectOutputStream(serverCon.socket().getOutputStream());
oos.writeObject(ns.loggedPlayersListItems);
oos.flush();
synchronized(ns.playersToRegisterToWrite) {
ns.playersToRegisterToWrite.add(player);
} catch(IOException e) {
e.printStackTrace();
}A part of client's CmdHandler's class' method run() - the method which handles commands triggered by server:
public void run() {
try {
while(works) {
String command = nc.readText(nc.serverCon);
System.out.println("Server przesyla komende: " + command + "\n");
String[] cmd = command.split("�");
if(cmd[0] != null && !cmd[0].equals("ERROR")) {
if(cmd[0].equals("CHAT")) {
if(nc.chooseGameDialog != null && nc.chooseGameDialog.isVisible()) { // jezeli na wybieraniu gry
newChatEntry(cmd[2] , null , cmd[3] , nc.chooseGameDialog.chatPane);
} else if(nc.readyDialog != null && nc.readyDialog.isVisible()) { // jesli na przygotowywaniu
Player sender = (Player)nc.actGame.players.get(nc.actGame.players.indexOf(new Player(Integer.parseInt(cmd[1]))));
newChatEntry(cmd[2] , sender.fraction , cmd[3] , nc.readyDialog.chatPane);
} else if(nc.ng != null) { // jesli w grze
Player sender = (Player)nc.actGame.players.get(nc.actGame.players.indexOf(new Player(Integer.parseInt(cmd[1]))));
newChatEntry(cmd[2] , sender.fraction , cmd[3] , nc.ng.inGameChatPane);
} else if(cmd[0].equals("UPDATELOGGEDPLAYERSLIST")) {
nc.sendText("OK" , nc.serverCon , false);
nc.serverCon.configureBlocking(true);
ObjectInputStream ois = new ObjectInputStream(nc.serverCon.socket().getInputStream());
DefaultListModel players = (DefaultListModel)ois.readObject();
nc.chooseGameDialog.updateLoggedPlayersList(players);
} catch(IndexOutOfBoundsException e) {
System.out.println(e);
} catch(IOException e) {
System.out.println(e);
} catch(ClassNotFoundException e) {
System.out.println(e);
}And two methods I used in codes above: sendText(String text , SocketChannel sc) and readText(SocketChannel sc) - they are my "utility" methods, which I use to send and receive Strings through specified SocketChannels.
boolean sendText(String text , SocketChannel sc) {
ByteBuffer bbuf = ByteBuffer.allocate(BSIZE);
boolean sendRetry;
boolean sent = false;
do {
sendRetry = false;
try {
StringBuffer cmd = new StringBuffer();
cmd.setLength(0);
if(text.length()+4 < 100)
cmd.append("0");
if(text.length()+4 < 10)
cmd.append("0");
cmd.append(Integer.toString(text.length()+4) + "�");
cmd.append(text);
cmd.append("\n");
bbuf = charset.encode(CharBuffer.wrap(cmd));
sc.write(bbuf);
bbuf.clear();
int n = sc.read(bbuf);
if(n == 1) {
bbuf.flip();
Byte re = bbuf.get();
if(re == 1) {
sendRetry = true;
} else {
sent = true;
} catch(Exception e) {
findAndDisconnectPlayer(sc);
try {
sc.close();
} catch(IOException f) {
f.printStackTrace();
return false;
} while(!sent && sendRetry);
return true;
String readText(SocketChannel sc) {
ByteBuffer bbuf = ByteBuffer.allocate(BSIZE);
int readRetryCount = -1;
boolean readRetry;
do {
readRetry = false;
readRetryCount++;
StringBuffer cmd = new StringBuffer();
cmd.setLength(0);
bbuf.clear();
try {
readLoop:
while(true) {
int n = sc.read(bbuf);
if(n > 0) {
bbuf.flip();
CharBuffer cbuf = charset.decode(bbuf);
while(cbuf.hasRemaining()) {
char c = cbuf.get();
if(c == '\r' || c == '\n') break readLoop;
cmd.append(c);
} else break;
statusArea.append(Thread.currentThread().getId() + " readText() odczytuje: " + cmd.toString() + "\n");
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sc.write(ByteBuffer.wrap(new byte[] {1}));
readRetry = true;
} else {
sc.write(ByteBuffer.wrap(new byte[] {0})); // length OK
return cmd.toString().substring(4 , cmd.toString().length());
} catch(Exception e) {
findAndDisconnectPlayer(sc);
try {
sc.close();
} catch(IOException f) {
f.printStackTrace();
return "ERROR";
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findAndDisconnectPlayer(sc);
try {
sc.close();
} catch(IOException e) {
e.printStackTrace();
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}Edited by: Kakalec on Jul 23, 2008 11:04 AMYou seem to be using a horrendous mixture of PrintWriters, BufferedReaders, ObjectOutputStreams, and no doubt ObjectInputStreams. You can't do that.
Some rules about this:
(a) Whenever you use a stream or reader or writer on a socket, you must allocate it once for the life of the socket, not every time you want to do an I/O.
There are many reasons for this including losing buffered data in the old stream and auto-closure of the socket on garbage-collection of the old stream.
(b) You can't mix stream types on the same socket. (i) If you're writing objects, use an ObjectOutputStream, you must read with an ObjectInputStream, and you can't read or write anything that isn't supported by the API of ObjectOutputStream. (ii) If you're writing lines, use a BufferedWriter and a BufferedReader at the other end. If you're writing characters, use a Writer and a Reader. (iii) If you're writing primitive data or UTF strings, use a DataOutputStream and a DataInputStream. (iv) If you're writing bytes, use DataOutputStream and a DataInputStream or an OutputStream and an InputStream. You can't mix (i), (ii), (iii), and (iv).
(c) Don't use PrintWriter or PrintStream over the network. They swallow exceptions that you need to know about. They are for writing to the console, or log files, where you don't really care about exceptions.
(d) Call flush() before reading.
(e) Always close the 'outermost' output stream or writer of a socket, never the input stream or the socket itself. Closing any of these closes the socket and therefore makes the other stream unusable, but only closing the output stream/writer will flush it. -
How to write a multi threaded Cache Event Listener
I have a distributed data cache called tokenCache for my application. I have also added a mapListener to this cache to listen to a particular kind of events.
tokenCache.addMapListener((MapListener) new TokenCacheListenerBean(), new MapEventFilter(tokenFilter), false);
So bascially everytime a token (The domain object of this cache) is updated the entryUpdated() method in my EJB TokenCacheListenerBean is invoked.
The issue I have though is that, from what I observe on running my code is that the Cache Listener is single threaded. So if two Token Objects on my tokenCache are updated,
lets say Token Object A and Token Object B one after the other, the entryUpdated() method in my EJB is invoked for Token Object A and once the invocation is complete
then the entryUpdated() method is invoked again for Token Object B(). At a given point of time there is only one instance of TokenCacheListenerBean EJB. Is there a way to
make this happen in multi-threaded manner ?
Is there a configuration setting somewhere which allows multiple CacheListeners to be instantiated at a given point of time ?
TokenCacheListenerBean EJB_
package oracle.communications.activation.asap.ace;
import java.util.Iterator;
import java.util.Set;
import java.util.logging.Logger;
import javax.ejb.Stateless;
import com.tangosol.net.NamedCache;
import com.tangosol.util.MapEvent;
import com.tangosol.util.MapListener;
import com.tangosol.util.ValueUpdater;
import com.tangosol.util.extractor.PofExtractor;
import com.tangosol.util.extractor.PofUpdater;
import com.tangosol.util.filter.EqualsFilter;
import com.tangosol.util.filter.LikeFilter;
import com.tangosol.util.filter.LimitFilter;
import com.tangosol.util.processor.UpdaterProcessor;
* Session Bean implementation class TokenCacheListenerBean
@Stateless
public class TokenCacheListenerBean implements TokenCacheListenerBeanRemote, TokenCacheListenerBeanLocal, MapListener {
NamedCache asdlCache;
NamedCache tokenCache;
private final int PAGE_SIZE = 1;
private static Logger logger = Logger.getLogger(ConnectionManager.class.getName());;
* An instance of the JCAModeler EJB, represents the JCA-JNEP
JCAModeler jcaBean;
* Default constructor.
public TokenCacheListenerBean() {
// TODO Auto-generated constructor stub
public void entryDeleted(MapEvent Event) {
public void entryInserted(MapEvent Event) {
public void entryUpdated(MapEvent Event) {
Token newToken = (Token) Event.getNewValue();
Token oldToken = (Token) Event.getOldValue();
if ((oldToken.getState() == Token.TOKEN_RESERVED)
&& (newToken.getState()== Token.TOKEN_AVAILABLE)) {
String networkID = newToken.getNeID();
asdlCache = AceCacheFactory.getCache("asdlCache");
tokenCache = AceCacheFactory.getCache("tokenCache");
EqualsFilter filterNE = new EqualsFilter(new PofExtractor(String.class,Asdl.NETWORKID), networkID);
LimitFilter limitFilter = new LimitFilter(filterNE, PAGE_SIZE);
Set removeASDL = asdlCache.keySet(limitFilter);
Iterator asdlIterator = removeASDL.iterator();
if (asdlIterator.hasNext()) {
logger.info(printASDLCache());
ValueUpdater updater = new PofUpdater(Token.STATE);
System.out.println("Token ID:" + newToken.getTokenID());
UpdaterProcessor updaterProcessor = new UpdaterProcessor(updater, Integer.toString(Token.TOKEN_RESERVED));
tokenCache.invoke(newToken.getTokenID(), updaterProcessor);
jcaBean = new JCAModeler(tokenCache);
Object asdlID = asdlIterator.next();
Asdl provisionAsdl = (Asdl) asdlCache.get(asdlID);
asdlCache.remove(asdlID);
jcaBean.provision(provisionAsdl, newToken.getTokenID());
logger.info(ConnectionManager.printTokenCache());
logger.info(printASDLCache());
}Here is what I am asking!
I have added 2 listeners (Listener A and Listener B) which each listen on for changes made to 2 different token Cache Objects (Token A and Token B).
for (i = 0; i < 2 ; i++) {
Token tokenAdded = new Token(UUID.randomUUID().toString(),TOKEN_AVAILABLE, networkID);
tokenCache.put(tokenAdded.getTokenID(), tokenAdded);
tokenCache.addMapListener((MapListener) new TokenCacheListener(), tokenAdded.getTokenID(), false);
Now assume that updates are made to Token A and Token B simuntaneosly.
Why do i observe in my diagnostic messages that only one Listener is invoked at a given point of time.
Which means I see Listener A getting invoked and then once invocation of Listener A is complete I see Listener B bieng invoked.
Ideally I would want both listeners to be invoked simultaneously rather than in a one off fashion.
Here is the code for my token cache Listener
package oracle.communications.activation.asap.ace;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;
import java.util.logging.Level;
import java.util.logging.Logger;
import com.tangosol.net.CacheFactory;
import com.tangosol.net.NamedCache;
import com.tangosol.util.AbstractMapListener;
import com.tangosol.util.Filter;
import com.tangosol.util.MapEvent;
import com.tangosol.util.MapListener;
import com.tangosol.util.ObservableMap;
import com.tangosol.util.ValueUpdater;
import com.tangosol.util.extractor.PofExtractor;
import com.tangosol.util.extractor.PofUpdater;
import com.tangosol.util.filter.AndFilter;
import com.tangosol.util.filter.EqualsFilter;
import com.tangosol.util.filter.LikeFilter;
import com.tangosol.util.filter.LimitFilter;
import com.tangosol.util.processor.UpdaterProcessor;
public class TokenCacheListener extends AbstractMapListener {
NamedCache asdlCache;
NamedCache tokenCache;
AceCacheFactory cacheFactoryBean = new AceCacheFactory();
private final int PAGE_SIZE = 1;
private static Logger logger = Logger.getLogger(ConnectionManager.class
.getName());;
* An instance of the JCAModeler EJB, represents the JCA-JNEP
JCAModeler jcaBean;
* This is a utility method and prints the tokens cache.
public String printTokenCache() {
NamedCache tokenCache = cacheFactoryBean.getCache("tokenCache");
LikeFilter tokenList = new LikeFilter(new PofExtractor(String.class,
Token.STATE), "%", (char) 0, false);
Set keySet = tokenCache.keySet(tokenList);
StringBuffer cachedTokenList = new StringBuffer("\n################################## Token(s) Cache ##################################");
int counter = 1;
for (Object tokenInCache: keySet) {
Token tokenObject = (Token) tokenCache.get(tokenInCache.toString());
cachedTokenList.append("\nS.NO:" + (counter++)
+ "\t ID:" + tokenInCache.toString()
+ "\t State:" + Token.tokenToString(tokenObject.getState()));
cachedTokenList.append("\n####################################################################################");
return cachedTokenList.toString();
* This method is a utility method and it prints all the ASDL(s) currently present on the
* asdlCache.
private String printASDLCache() {
NamedCache asdlCache = cacheFactoryBean.getCache("asdlCache");
LikeFilter asdlList = new LikeFilter(new PofExtractor(String.class,
Asdl.NETWORKID), "%", (char) 0, false);
Set keySet = asdlCache.keySet(asdlList);
StringBuffer cachedASDLList = new StringBuffer("\n################ ASDL Cache ######## ########");
int counter = 1;
for (Object asdlInCache: keySet) {
cachedASDLList.append("\nS.NO:" + (counter++) + "\t ID:" + asdlInCache.toString());
cachedASDLList.append("\n################ ASDL Cache ######## ########\n");
return cachedASDLList.toString();
public TokenCacheListener() {
public void checkASDLCache(MapEvent Event) {
// Not currently used
public void entryUpdated(MapEvent Event) {
Token newToken = (Token) Event.getNewValue();
Token oldToken = (Token) Event.getOldValue();
logger.info("\n=============================================================================================="
+ "\nTOKEN CACHE LISTENER"
+ "\n=============================================================================================="
+ printTokenCache()
+ "\n==============================================================================================");
if ((oldToken.getState() == Token.TOKEN_RESERVED)
&& (newToken.getState()== Token.TOKEN_AVAILABLE)) {
String networkID = newToken.getNeID();
asdlCache = cacheFactoryBean.getCache("asdlCache");
tokenCache = cacheFactoryBean.getCache("tokenCache");
EqualsFilter filterNE = new EqualsFilter(new PofExtractor(String.class,Asdl.NETWORKID), networkID);
LimitFilter limitFilter = new LimitFilter(filterNE, PAGE_SIZE);
Set removeASDL = asdlCache.keySet(limitFilter);
Iterator asdlIterator = removeASDL.iterator();
if (asdlIterator.hasNext()) {
logger.info(printASDLCache());
ValueUpdater updater = new PofUpdater(Token.STATE);
System.out.println("Token ID:" + newToken.getTokenID());
UpdaterProcessor updaterProcessor = new UpdaterProcessor(updater, Integer.toString(Token.TOKEN_RESERVED));
tokenCache.invoke(newToken.getTokenID(), updaterProcessor);
jcaBean = new JCAModeler(tokenCache);
Object asdlID = asdlIterator.next();
Asdl provisionAsdl = (Asdl) asdlCache.get(asdlID);
asdlCache.remove(asdlID);
jcaBean.provision(provisionAsdl, newToken.getTokenID());
logger.info(printTokenCache());
logger.info(printASDLCache());
I only see one instance of this listener alive at any given point of time.
Edited by: 807103 on Nov 3, 2011 1:00 PM
Edited by: 807103 on Nov 3, 2011 1:12 PM -
Java.lang.Exception: IOException in sending Request :: Connection refused:
Hi all,
I am a new to Oracle 10g.I am using Enterprise manager for DBA jobs.After ogging in to enterprise manager, when i click the refresh button, i get the folllowing error
" java.lang.Exception: IOException in sending Request :: Connection refused: connect"
Please do help to slove this problem.
ThanksI'm having the same error in my console header. Here is the content of the emagent.trc file.
Running 10gR2 on Win 2K3 server. (bold added for readability)
emctl status dbconsole responds with 'EM Daemon is not running'
2007-03-29 14:02:23 Thread-1776 ERROR pingManager: nmepm_pingReposURL: Did not receive a response header from repository
2007-03-29 14:02:23 Thread-1776 WARN main: clear collection state due to OMS_version difference
2007-03-29 14:02:23 Thread-1776 WARN command: Job Subsystem Timeout set at 600 seconds
2007-03-29 14:02:24 Thread-1776 WARN upload: Upload manager has no Failure script: disabled
2007-03-29 14:02:24 Thread-1776 WARN upload: Recovering left over xml files in upload directory
2007-03-29 14:02:24 Thread-2920 ERROR command: nmejcn: received no status header from repository at http://dB_Domain:5500/em/upload/
2007-03-29 14:02:24 Thread-1776 WARN upload: Recovered 0 left over xml files in upload directory
2007-03-29 14:02:25 Thread-1776 WARN metadata: Metric collectSnapshot does not have any data columns
2007-03-29 14:02:27 Thread-1776 WARN metadata: Metric Disk_Path does not have any data columns
2007-03-29 14:02:27 Thread-1776 WARN metadata: Metric osm_diskGroupPolicies does not have any data columns
2007-03-29 14:02:53 Thread-1776 WARN TargetManager: Regenerating all Metadata
2007-03-29 14:05:17 Thread-1776 ERROR util.files: ERROR: nmeufis_new: failed in lfiopn on file: E:\oracle\product\10.2.0\db_3\dB_Domain_SIGD\sysman\emd\agntstmp.txt. error = 2 (No such file or directory)
2007-03-29 14:05:28 Thread-1776 ERROR collector: nmecs_validateStateFile(): state file invalid : E:\oracle\product\10.2.0\db_3\dB_Domain_SIGD\sysman\emd\state\snapshot
2007-03-29 14:05:28 Thread-1776 ERROR collector: Collector state files cleaned, severity will be resent
2007-03-29 14:05:35 Thread-3660 ERROR upload: Error in uploadXMLFiles. Trying again in 60.00 seconds.
2007-03-29 14:05:48 Thread-676 ERROR upload: Failed to delete/move xml file C:\WINDOWS\TEMP\X11.uod, ret = -2 ; agent exiting
2007-03-29 14:05:48 Thread-676 ERROR : Signalled to Exit with status 3
2007-03-29 14:05:48 Thread-1776 ERROR main: EMAgent abnormal terminating
2007-03-29 14:06:29 Thread-2996 WARN command: Job Subsystem Timeout set at 600 seconds
2007-03-29 14:06:29 Thread-2996 WARN upload: Upload manager has no Failure script: disabled
2007-03-29 14:06:29 Thread-2996 WARN upload: Recovering left over xml files in upload directory
2007-03-29 14:06:29 Thread-2996 WARN upload: Recovered 5 left over xml files in upload directory
2007-03-29 14:06:29 Thread-2996 WARN upload: Merging leftover data file named errors.dat
2007-03-29 14:06:29 Thread-2996 WARN upload: Merging leftover data file named severity.dat
2007-03-29 14:06:30 Thread-2996 WARN upload: Merging leftover data file named rawdata.dat
2007-03-29 14:06:30 Thread-2996 WARN metadata: Metric collectSnapshot does not have any data columns
2007-03-29 14:06:31 Thread-2996 WARN metadata: Metric Disk_Path does not have any data columns
2007-03-29 14:06:31 Thread-2996 WARN metadata: Metric osm_diskGroupPolicies does not have any data columns
2007-03-29 14:07:29 Thread-2328 ERROR util.files: nmeufile_getLength: Error in lfilen. Error = 2 (No such file or directory)
2007-03-29 14:15:19 Thread-1960 WARN http: 268,-1: nmehl_httpListener: signaled to exit from emctl
Thank you for your help!
Message was edited by:
david.d -
Exchange 2010 SP2 Server
iPhone iOS 5.01 (4/4s) using ActiveSync
Outlook 2007 clients
When multi-day (not 'all day') meeting requests or appointments are being sent to email accounts which have an iPhone attached to the Exchange account via ActiveSync, the iPhone accepts the meeting request but then moves the event one day later than what it was originally scheduled and posts it to Outlook - also 1 day later than it is supposed to be.
For example: A meeting request comes into my that is schedule for 9AM-4PM M-W but when I accept it on my iphone it gets posted to my calendar as an ALL DAY event but T-Thu
We upgraded to Exchange SP2 because some of the threads were alluding that SP2 would fix it - it didn't. I know the fix is to rip out the event to separate calendar events but this will not work for reqeusts coming from outside. And this is too tedious. If anything, it is a serious bug.
Anybody seen this before?
Thanks,
Monty.I am experiencing a similar problem with a client of mine who is using Microsoft's Cloud-based Exchange server, Office 365. I suspect the Office 365 server is an Exchange 2010 server, similar to your environment. Check out my tests below which I think define when the day shifting happens.
I see that you applied SP2 to your Exchange 2010 environment, but have you also applied Update Rollup 1? See this article: http://support.microsoft.com/kb/2563324. It would be interesting to know whether that rollup resolves your problem.
I have done some pretty extensive testing and have posted in the Office 365 Support Forum (http://community.office365.com/en-us/f/146/p/53396/192332.aspx#192332) Here is a summary of my testing.
I am having the exact same problem described by Jim Edmonds and jkwmail (http://community.office365.com/en-us/f/176/p/19921/93304.aspx#93304) with one of my clients who is not very happy about this or our inability to resolve the problem. Here is what I am experiencing:
When an appointment in Office 365 spans multiple days, the appointment gets converted to an All Day Event and moved forward one day on an iPhone ActiveSync client.
I have completed the following troubleshooting:
1 - Using my GMail Account and my work email account on MS Exchange 2007 SP 2 Server I created separate single day appointments in the morning from each account spanning two hours and invited my client who is using MS Outlook 2010 and Office 365.
Result: The appointments show the correct date and time on my Outlook, MS Exchange 2007 SP 2 OWA, and iPhone as well as my client's Outlook, Office 365 webmail, and iPhone.
2 - Using my GMail Account and my work email account on MS Exchange 2007 SP 2 Server I created separate single day appointments in the afternoon from each account spanning two hours and invited my client who is using MS Outlook 2010 and Office 365.
Result: The appointments show the correct date and time on my Outlook, MS Exchange 2007 SP 2 OWA, and iPhone as well as my client's Outlook, Office 365 webmail, and iPhone.
3 - Using my GMail Account and my work email account on MS Exchange 2007 SP 2 Server I created separate multi-day appointments from Friday at 5 PM to Monday at 8 AM from each account and invited my client who is using MS Outlook 2010 and Office 365.
Result: The appointments show the correct date and time on my Outlook, MS Exchange 2007 SP 2 OWA, and iPhone as well as my client's Outlook and Office 365 webmail. However, on my client's iPhone, the time on the appointments had changed to an all day event and the start date was shifted one day forward, Saturday, and the end date was Monday unless the appointment end time was after the appointment start time in which case it created an All Day Event on Tuesday as well. For Example: If the appointment was from 8 AM Friday Morning to 8 AM Monday Morning, the iPhone would show an All Day Event on Saturday, Sunday, and Monday. If the appointment was from 8 AM Friday Morning to 8:30 AM Monday Morning, the iPhone would show an All Day Event on Saturday, Sunday, Monday, and Tuesday. If the appointment was from 8 AM Friday Morning to 7:30 AM Monday Morning, the iPhone would show an All Day Event on Saturday, Sunday, and Monday. This was also true for appointments starting on Friday at 5 PM and ending on Monday at 5 PM, starting on Friday at 5 PM and ending on Monday at 5:30 PM, and starting on Friday at 5 PM and ending on Monday at 4:30 PM as in the above AM examples.
*** Again I would like to note that on my iPhone which is connected to my company's MS Exchange 2007 SP 2 server, the multi-day appointment shows up correctly with correct start and end times and is not converted to an All Day Event. ***
It would seem this is a problem with ActiveSync on Office 365 and iOS devices. What is particularly frustrating is that this exact problem is identified in KB 2563324 (http://support.microsoft.com/kb/2563324) Issue 1.6 - "An appointment is longer than 24 hours is changed to a multi-day All Day Event" which states: "To resolve this issue, install Update Rollup 1 for Exchange Server 2010 Service Pack 2 (SP2)." Since this is a cloud based service, we do not have the ability to either see what the current version of the Exchange service we are connected to is or update the service with this patch level.
4 - I performed the above three tests with my client creating the events in MS Outlook 2010 and inviting my work account on the MS Exchange 2007 SP 2 Server and got the exact same results.
5 - My client's iPhone is running iOS 4.3 and my iPhone is running iOS 5.1.0. In order to test this without going through the update process on my client's iPhone, I set up his Office 365 account on my iPhone and performed the tests in numbers 1-4 from above, viewing the results on my iPhone, and got the exact same results.
6 - Today, I tried this with a different Office 365 account, performed the multi-day test in number 3 from above and got the exact same results.
7 - Today I also upgraded my iPhone to iOS 5.1.1, performed the multi-day test in number 3 from above and got the exact same results.
8 - I have confirmed that all time zones are set correctly. I have checked the iPhone, OWA, Office 365 Webmail, etc.
I believe the problem in my case is with the Office 365 environment and not the iOS device. However, trying to get support from these large companies seems to be very difficult?
Does anyone from Apple know if this is an iOS bug or a problem with Exchange 2010/Office 365?
Thanks...
Jp -
Multi threading under single file channel
Hi,
We have File-Proxy scenario .
We are using fCC sender channel and using
recordset sequence as varaibale
recordsets per message was 250.
When large size file like 2GB was processed, PI is taking 45-50 min to process the file and from proxy end its taking 8 hrs to process this file.
we are using one channel and 250 recordsets per message by chunking file and process to target. We are following EOIO for sequence for these chunk files.
with this approach in PI target system proxy is taking huge time to process.
experts suggested using multi threading and multiple channels are the ideal solution for this issue.
am expecting with multiple channels and multi threading will cause issue for receiver proxy because of more objects and current approach is fine.
Please suggest any other alternatives we can acheive in PI with respect to this issue?
Note: I checked blog for file chunk option under Adv parameters and I cant use that here as FCC and Mapping is there .
Rgds,
amanHi Aman,
We had file to proxy interface and the XML payload of the proxy was around 400mb...to reduce the time taken in PI in mapping step we reduced the XML payload of the proxy by cutting the XML tagnames.
for example an xml field <firstname>Anand</firstname> was converted to <f>Anand</f>
with this we were able to achieve about 40-50% reduction in XML payload the file and a good improvement in the time taken by PI mapping to process the file.
Hope it helps,
Thanks,
Anand -
Multi-Threaded server using ThreadPool
Dear friends,
I am writing a client-server program in which the client and server communicate using SUN-RPC. The client reads a file containing some numbers and then spawns threads which it uses to request the server for a service. These threads are executed using a thread pool. Till this time, it's working fine. But when it comes to the server, the real trouble begins because it too needs to be made a multi-threaded one using thread pooling. The server has to capture the call information for each request for the service and then pass this information to a thread/runnable object in whose run() method the code for execution of the service would be present. Since the tasks(requests for the service) are not present already, i am unable to execute the server side threads in a loop using a thread pool. How to solve this problem? Kindly help.
Thanks,
SubhashThe server has to capture the call information for each request for the serviceWhy?
and then pass this information to a thread/runnable object in whose run() method the code for execution of the service would be present.Why can't the run() method get the call information when it starts? That's what's normally done. The server's accept loop mustn't do any other I/O: otherwise a rogue client can block the server complete.y
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