Non-blocking execution with Pro*C/C++
Hi readers,
Is there any mechanism available through which Non-blocking execution with Pro*C/C++?
I observe that Pro*C queries are hanged when the DB server (hardware) is down.
I understand that OCI provides non-blocking mechanisms. Pro*C doesn't use this OCI functionality?
Regards,
RajaGopal Maddi
You can use TAF to handle your db down scenario.
http://www.oracle.com/technetwork/database/app-failover-oracle-database-11g-173323.pdf
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NIO: Strange problem when using ByteBuffer with non-blocking SocketChannel
Hi,
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Broken Pipe with Non-blocking Socket
Hello,
I write a Unix Agent who connect on a Windows Server with socket...
Working well on Linux but on Solaris my problem is:
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i am using Mac book pro with non retina display with latest software yosemitte. When I on the Mac it is taking much time to on the mac / to get main screen. Please suggest us if any option to make it fastThere are several things that could make the computer run slower than expected
or slower than previously experienced from time to time; if a new system was
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http://www.thesafemac.com/tech-guides/
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What is wrong with my non-blocking client?
I have two classes here, my abstract base class SingleSocketHandler, and its concrete subclass SingleSocketHandlerImpl. The subclass implements the protocol and parsing of my server.
For some reason, my server is not receiving the packet my client sends to it, and my client is getitng nothing in return (which makes sense, the server is supposed to respond to the logon packet). I make it non-blocking AFTER logon, so I knwo that this is not a problem. Can you see why my server is not receiving the packet my client writes to it? Did I not configure some setting with the SocketChannel that enables it to write? I am sort of unfamiliar with the java.nio.channels package, so the problem may be related to a setting in the SocketChannel or whatnot that I haven't configured.
NOTE: My chat server works fine with my blocking, multi-threaded test clients. Just not for my non-blocking client. The original problem for my blocking clients was that once the server stopped sending them data, they'd get caught in the in.read() loop and never get out of it. That's why I turned to non-blocking.
Just to remind you, my question is: why isn't my client sending the logon packet AND/OR my server receiving+responding to it?
public abstract class SingleSocketHandler extends Thread
/* Subclasses must implement these methods
/* Even though they're not a (public) interface */
/** <------------------------------- */
abstract void parse(int num);
abstract void parseNext();
abstract void doLogon();
/** -------------------------------> */
private SocketChannel sock;
/* Queues for in and out buffers */
private LinkedList <ByteBuffer> qIn;
private LinkedList <ByteBuffer> qOut;
/* Server info */
private String hostname;
private int port;
/* Flags */
protected int flags;
protected final int LOGGED_ON = 0x01;
* Default Constructor
protected SingleSocketHandler()
initQs();
* Constructor that sets socket info
* @param hostname
* @param port
* @param connect
protected SingleSocketHandler(String hostname, int port, boolean connect)
initQs();
if (connect)
connect(hostname, port);
else
setSocket(hostname, port);
* Switches off between reading and writing
protected void handleIO()
try
sock.configureBlocking(false);
} catch (IOException e)
// TODO
readInBuffers(1);
writeOutBuffers(1);
* Read in specified number of buffers into in queue
* Call for parsing
* @param num
protected void readInBuffers(int num)
Reporter.println("READING BUFFER");
for (int i = 0; i < num; i++)
ByteBuffer header = ByteBuffer.allocate(ProtocolCheck.HEADER_LEN);
try
Reporter.println("Reading header...");
sock.read(header);
Reporter.println("Read header.");
} catch (IOException e)
// TODO
/* Only add packet to in queue if it has a valid header */
if (ProtocolCheck.validHeader(header.array()))
Reporter.println("valid header");
ByteBuffer packet = ByteBuffer.allocate(ProtocolCheck.findPacketLen(header.array()));
packet.put(header);
try
Reporter.println("Reading rest of packet...");
sock.read(packet);
Reporter.println("Read packet.");
} catch (IOException e)
// TODO
addInBuffer(packet);
* Write out specified number of buffers from out queue
* And remove from out queue
* @param num
protected void writeOutBuffers(int num)
Reporter.println("WRITING BUFFER");
int i = 0;
while (qOut.size() > 0 && i < num)
try
sock.write(nextOutBuffer());
Reporter.println("Wrote buffer.");
} catch (IOException e)
// TODO
i++;
* Returns and removes next buffer from in queue
* @return ByteBuffer
protected ByteBuffer nextInBuffer()
return qIn.remove();
* Returns and removes next buffer from out queue
* @return ByteBuffer
protected ByteBuffer nextOutBuffer()
return qOut.remove();
* Sees if there is anohter in buffer
* @return boolean
protected boolean hasNextInBuffer()
return qIn.size() > 0;
* Sees if there is another out buffer
* @return ByteBuffer
protected boolean hasNextOutBuffer()
return qOut.size() > 0;
* Add a buffer to in queue
* @param b
public void addInBuffer(ByteBuffer b)
qIn.add(b);
* Add a buffer to in queue
* @param b
public void addInBuffer(Bufferable b)
qIn.add(b.getByteBuffer());
* Add a buffer to out queue
* @param b
public void addOutBuffer(ByteBuffer b)
qOut.add(b);
* Add a buffer to out queue
* @param b
public void addOutBuffer(Bufferable b)
qOut.add(b.getByteBuffer());
* Instantiate queues
protected void initQs()
qIn = new LinkedList <ByteBuffer> ();
qOut = new LinkedList <ByteBuffer> ();
* Set socket info then call connect()
* @param hostname
* @param port
public void connect(String hostname, int port)
setSocket(hostname, port);
connect();
* Connect to server
public void connect()
try
sock = SocketChannel.open();
sock.configureBlocking(true);
sock.connect(new InetSocketAddress(hostname, port));
while (!sock.finishConnect())
} catch (IOException e)
// TODO
* Disconnect from server
public void disconnect()
try
sock.close();
} catch (IOException e)
// TODO
* Set socket info without connecting
* @param hostname
* @param port
public void setSocket(String hostname, int port)
this.hostname = hostname;
this.port = port;
* @return state of connection
public boolean isConnected()
return (sock != null && sock.isConnected());
* @return state of being logged on
public boolean isLoggedOn()
return (sock != null && (flags & LOGGED_ON) == LOGGED_ON);
public final class SingleSocketHandlerImpl extends SingleSocketHandler
private UserDatabase <User> users;
* Constructor that does not set socket info
public SingleSocketHandlerImpl(UserDatabase <User> users)
super();
this.users = users;
* Constructor that does set socket info
* @param hostname
* @param port
* @param connect
public SingleSocketHandlerImpl(String hostname, int port, boolean connect, UserDatabase <User> users)
super(hostname, port, connect);
this.users = users;
* Thread's run method (base class extends Thread)
public void run()
doLogon();
while (isConnected() && isLoggedOn())
handleIO();
* Parses specified number of buffers from in queue
* @param num
/* (non-Javadoc)
* @see client.SingleSocketHandler#parseNext()
@Override
protected void parse(int num)
Reporter.println("Parse(int num) called.");
int i = 0;
while (hasNextInBuffer() && i < num)
parseNext();
i++;
/* (non-Javadoc)
* @see client.SingleSocketHandler#parseNext()
@Override
protected void parseNext()
Reporter.println("Parsing!");
if (!hasNextInBuffer())
Reporter.println("NO IN BUFFER.");
return;
/* Get buffer to work with */
ByteBuffer inBuffer = nextInBuffer();
byte[] data = inBuffer.array();
/* Decide what to do based on message ID */
byte msgid = data[1];
switch (msgid) {
case 0x01:
Reporter.println("0x01 packet.");
/* Determine success of login */
byte success = data[3];
if (success == (byte) 1)
flags |= LOGGED_ON;
Reporter.println("Logged on!");
else
flags &= ~LOGGED_ON;
Reporter.println(" <eChat> Unable to logon. Check the hostname and port settings.");
break;
case 0x02:
/* Parse out text message */
byte[] txtmsgbytes = new byte[data.length - 3];
System.arraycopy(data, 3, txtmsgbytes, 0, txtmsgbytes.length);
String txtmsg = new String(txtmsgbytes);
Reporter.println(txtmsg);
break;
case 0x03:
System.out.println("Packet ID not yet handled.");
break;
case 0x04:
System.out.println("Packet ID not yet handled.");
break;
default:
System.out.println("validID() method is buggy.");
* I make it non-blocking after logon sequences
/* (non-Javadoc)
* @see client.SingleSocketHandler#doLogon()
@Override
protected void doLogon()
Reporter.println("DOING LOGON!");
User myUser = users.getCurr();
addOutBuffer(new ScpLogon(myUser.getUsername(), myUser.getPassword()));
writeOutBuffers(1);
readInBuffers(1);
parseNext();
}Oh, if this helps, this is what gets output to my GUI. I did a lot of outputs for debugging purposes.
[3:29:27 PM]: Connecting...
[3:29:27 PM]: Connected!
[3:29:27 PM]: Logging on...
[3:29:27 PM]: DOING LOGON!
[3:29:27 PM]: WRITING BUFFER
[3:29:27 PM]: Wrote buffer.
[3:29:27 PM]: READING BUFFER
[3:29:27 PM]: Reading header... -
Troubles with timeout using java.nio.channels and non-blocking sockets
Hello.
I have a server application that employs java.nio.channels with non-blocking sockets.
The server waits for connections. The client should connect and be first in sending data.
Timeouts are significant! If client exceeds the allowed time to send data, the server should break the connection.
The huge trouble I've discovered that I cannot control the timeout when client connects but remains silent.
My code looks as follows:
<pre>
Selector oSel;
SocketChannel oSockChan;
Socket oSock;
SelectionKey oSelKey;
Iterator<SelectionKey> oItSelKeys;
int iCurrState, iMask, iCount;
iCurrState = INT_SERVER_WORKING;
iMask = SelectionKey.OP_ACCEPT | SelectionKey.OP_CONNECT | SelectionKey.OP_READ | SelectionKey.OP_WRITE;
while ( iCurrState == INT_SERVER_WORKING )
try
*// retrieving next action*
iCount = oSel.select();
if ( iCount > 0 )
oItSelKeys = oSel.selectedKeys().iterator();
while ( oItSelKeys.hasNext() )
oSelKey = oItSelKeys.next();
oItSelKeys.remove();
if ( oSelKey.isValid() )
switch ( oSelKey.readyOps() & iMask ) {
case SelectionKey.OP_ACCEPT :
oSockChan = oSSockChan.accept();
oSockChan.configureBlocking(false);
oSock = oSockChan.socket();
oSock.setKeepAlive(true);
oSockChan.register(oSel,SelectionKey.OP_READ,new MyPacket(oSock.getInetAddress(),oSock.getPort()));
break;
case SelectionKey.OP_READ :
oSelKey.interestOps(0);
((MyPacket) oSelKey.attachment()).inRequest(); *// preparing request*
this.getReader().add(oSelKey); *// sending key to reading thread*
break;
case SelectionKey.OP_WRITE :
oSelKey.interestOps(0);
((MyRequest) oSelKey.attachment()).inResponse(); *// preparing response*
this.getWriter().add(oSelKey); *// sending key to writing thread*
break;
case SelectionKey.OP_CONNECT :
default :
*// nothing to do*
catch ( IOException oExcept )
*// do some actions*
</pre>
Timeouts are easily controlled by reading and writing threads (see OP_READ and OP_WRITE ).
But when a client just connects without consequent data send, the state of this connection remains as OP_ACCEPT. The connection remains open for arbitrarily large time and I cannot control it!
Please help with idea how can I terminate such connections!How can I process the keys that weren't selected at the bottom of the loop? Should I use the method keys() ?Yes. Form a new set from keys() and removeAll(selectedKeys()). Do that before you process selectedKeys().
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Environnement with pro-cobol and linux redhat
Hi,
I have a linux redhat Linux 2.6.9-55.ELsmp #1 SMP Fri Apr 20 17:03:35 EDT 2007 i686 i686 i386 GNU/Linux
and oracle 11g database where we have installed Pro-cobol with a launcher xframe ( not me !)
we want to use command-line with pro-cobol :
exemples :
export COBOLOPTS="-dy -shared -M -lxconv -L$XFRAMEHOME/lib -I $PWD -WC,""DLOAD"" -WC,""SOURCE"" -WC,""COPY"" -WC,""XREF"" -WC,""FLAG(E)"" -WC,""MODE(STD)"" -WC,""ALPHAL(WORD)"" -WC,""NOTRUNC"" -WC,""NOSDS"" -WC,""SRF(FIX)"" -WC,""MAP"" -do ./ -dp ./ "
cobol -o OV1SLSP.e OV1SLSP.pre OV1MADR0.o $ORACLE_HOME/precomp/lib/cobsqlintf.o OV1MADR1.pre.o OV1MSNT0.pre.o 2> OV1SLSP.errors
execution:
OV1SLSP.e
results
Erreur de segmentation
we have a this error.
but when we use xframe launcher :
execution:
xrun OV1SLSP
results
XRUN: STARTING OV1SLSP
OV1MADR0 PLANTAGE SQL RNVP : -1012
SQLERRMC ORA-01012: non connecté
COBOL:rts: HALT: JMP0015I-U [PID:000004A0 TID:B7FFC940] CANNOT CALL PROGRAM 'COBCANC'. xvsamRts: undefined symbol: COBCANC PGM=OV1MADR0
XRUN: TERMINATED WITH CODE 134
=>This message is normal because we have connect to database !
It's working perfect.
My question is : what is the correct librairies to have to make static compiling pro-cobol's programs?
hope to be cleared.
Thanks.
Edited by: french_dam on 28 janv. 2011 10:07
Edited by: french_dam on 28 janv. 2011 10:11Have you checked the system requirements for using Pro-Cobol with Oracle 11g and Linux? See here:
Pro*COBOL® Programmer's Guide 11g Release 1 (11.1)
http://download.oracle.com/docs/cd/B28359_01/appdev.111/b28428/pcoabops.htm#insertedID1
Hope this helps,
Ben -
How to generate non-blocking commands to a serial device
I have a serial device which accepts non-blocking commands. This is, if you send a command that takes 1 minute, while this happens, you can send more commands and they will be executed. Once a command is done, it sends back a code that relates to that command, so you know it is finished.
I have a VI which tries to communicate with this serial device (see attachment). It does work, but it blocks the execution until a command is finished. So I can send commands one by one, but not in parallel, or in a delayed non-block way. The problem is the while loop which waits until the device outputs something.
I need to do something similar, but non blocking. The VI should be able to send several commands while others are executed.
This subVI is controlled from a main VI, which is just a State Machine with a few states, where each state is some action which is sent to this subVI, and then to the serial device.
Attachments:
blocking_vi.png 27 KBUse another loop that does nothing but read from the serial port. Report the data to whoever needs it with a Queue.
There are only two ways to tell somebody thanks: Kudos and Marked Solutions
Unofficial Forum Rules and Guidelines -
Oracle 11.2 - Perform parallel DML on a non partitioned table with LOB column
Hi,
Since I wanted to demonstrate new Oracle 12c enhancements on SecureFiles, I tried to use PDML statements on a non partitioned table with LOB column, in both Oracle 11g and Oracle 12c releases. The Oracle 11.2 SecureFiles and Large Objects Developer's Guide of January 2013 clearly says:
Parallel execution of the following DML operations on tables with LOB columns is supported. These operations run in parallel execution mode only when performed on a partitioned table. DML statements on non-partitioned tables with LOB columns continue to execute in serial execution mode.
INSERT AS SELECT
CREATE TABLE AS SELECT
DELETE
UPDATE
MERGE (conditional UPDATE and INSERT)
Multi-table INSERT
So I created and populated a simple table with a BLOB column:
SQL> CREATE TABLE T1 (A BLOB);
Table created.
Then, I tried to see the execution plan of a parallel DELETE:
SQL> EXPLAIN PLAN FOR
2 delete /*+parallel (t1,8) */ from t1;
Explained.
SQL> select * from table(dbms_xplan.display);
PLAN_TABLE_OUTPUT
Plan hash value: 3718066193
| Id | Operation | Name | Rows | Cost (%CPU)| Time | TQ |IN-OUT| PQ Distrib |
| 0 | DELETE STATEMENT | | 2048 | 2 (0)| 00:00:01 | | | |
| 1 | DELETE | T1 | | | | | | |
| 2 | PX COORDINATOR | | | | | | | |
| 3 | PX SEND QC (RANDOM)| :TQ10000 | 2048 | 2 (0)| 00:00:01 | Q1,00 | P->S | QC (RAND) |
| 4 | PX BLOCK ITERATOR | | 2048 | 2 (0)| 00:00:01 | Q1,00 | PCWC | |
| 5 | TABLE ACCESS FULL| T1 | 2048 | 2 (0)| 00:00:01 | Q1,00 | PCWP | |
PLAN_TABLE_OUTPUT
Note
- dynamic sampling used for this statement (level=2)
And I finished by executing the statement.
SQL> commit;
Commit complete.
SQL> alter session enable parallel dml;
Session altered.
SQL> delete /*+parallel (t1,8) */ from t1;
2048 rows deleted.
As we can see, the statement has been run as parallel:
SQL> select * from v$pq_sesstat;
STATISTIC LAST_QUERY SESSION_TOTAL
Queries Parallelized 1 1
DML Parallelized 0 0
DDL Parallelized 0 0
DFO Trees 1 1
Server Threads 5 0
Allocation Height 5 0
Allocation Width 1 0
Local Msgs Sent 55 55
Distr Msgs Sent 0 0
Local Msgs Recv'd 55 55
Distr Msgs Recv'd 0 0
11 rows selected.
Is it normal ? It is not supposed to be supported on Oracle 11g with non-partitioned table containing LOB column....
Thank you for your help.
MichaelYes I did it. I tried with force parallel dml, and that is the results on my 12c DB, with the non partitionned and SecureFiles LOB column.
SQL> explain plan for delete from t1;
Explained.
| Id | Operation | Name | Rows | Cost (%CPU)| Time | TQ |IN-OUT| PQ Distrib |
| 0 | DELETE STATEMENT | | 4 | 2 (0)| 00:00:01 | | | |
| 1 | DELETE | T1 | | | | | | |
| 2 | PX COORDINATOR | | | | | | | |
| 3 | PX SEND QC (RANDOM)| :TQ10000 | 4 | 2 (0)| 00:00:01 | Q1,00 | P->S | QC (RAND) |
| 4 | PX BLOCK ITERATOR | | 4 | 2 (0)| 00:00:01 | Q1,00 | PCWC | |
| 5 | TABLE ACCESS FULL| T1 | 4 | 2 (0)| 00:00:01 | Q1,00 | PCWP | |
The DELETE is not performed in Parallel.
I tried with another statement :
SQL> explain plan for
2 insert into t1 select * from t1;
Here are the results:
11g
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time | TQ |IN-OUT| PQ Distrib |
| 0 | INSERT STATEMENT | | 4 | 8008 | 2 (0)| 00:00:01 | | | |
| 1 | LOAD TABLE CONVENTIONAL | T1 | | | | | | | |
| 2 | PX COORDINATOR | | | | | | | | |
| 3 | PX SEND QC (RANDOM) | :TQ10000 | 4 | 8008 | 2 (0)| 00:00:01 | Q1,00 | P->S | QC (RAND) |
| 4 | PX BLOCK ITERATOR | | 4 | 8008 | 2 (0)| 00:00:01 | Q1,00 | PCWC | |
| 5 | TABLE ACCESS FULL | T1 | 4 | 8008 | 2 (0)| 00:00:01 | Q1,00 | PCWP | |
12c
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time | TQ |IN-OUT| PQ Distrib |
| 0 | INSERT STATEMENT | | 4 | 8008 | 2 (0)| 00:00:01 | | | |
| 1 | PX COORDINATOR | | | | | | | | |
| 2 | PX SEND QC (RANDOM) | :TQ10000 | 4 | 8008 | 2 (0)| 00:00:01 | Q1,00 | P->S | QC (RAND) |
| 3 | LOAD AS SELECT | T1 | | | | | Q1,00 | PCWP | |
| 4 | OPTIMIZER STATISTICS GATHERING | | 4 | 8008 | 2 (0)| 00:00:01 | Q1,00 | PCWP | |
| 5 | PX BLOCK ITERATOR | | 4 | 8008 | 2 (0)| 00:00:01 | Q1,00 | PCWC | |
It seems that the DELETE statement has problems but not the INSERT AS SELECT ! -
Difficulties for launching process execution with platformRequest(String)
Hello,
by April, 10, I have posted a message concerning how to lauch a process by means of a midlet. I have got a response from your part to proposing to use:
platformRequest(String).
I have tested this command successfully for lauching webpages.
But It did not work for lauching programs such as "java myprog"
It seems that the platformRequest(String) cannot lauch the dos prompt
and therefore the process hangs. The displayed message is: Performing platformRequest for URL: java myprog
I wonder if someone can provide an example of a midlet that lauches the execution of a program.
Thanks for your help
wahaba mobile device is not a personal computer...
could you please re-read this:
platformRequest
public final boolean platformRequest(String URL)
throws ConnectionNotFoundException
Requests that the device handle (for example, display or install) the indicated URL.
If the platform has the appropriate capabilities and resources available, it SHOULD
bring the appropriate application to the foreground and let the user interact with the
content, while keeping the MIDlet suite running in the background. If the platform does not
have appropriate capabilities or resources available, it MAY wait to handle the URL
request until after the MIDlet suite exits. In this case, when the requesting MIDlet suite
exits, the platform MUST then bring the appropriate application (if one exists) to the
foreground to let the user interact with the content.
This is a non-blocking method. In addition, this method does NOT queue multiple
requests. On platforms where the MIDlet suite must exit before the request is handled, the
platform MUST handle only the last request made. On platforms where the MIDlet suite
and the request can be handled concurrently, each request that the MIDlet suite makes
MUST be passed to the platform software for handling in a timely fashion.
If the URL specified refers to a MIDlet suite (either an Application Descriptor or a JAR file),
the application handling the request MUST interpret it as a request to install the named
package. In this case, the platform's normal MIDlet suite installation process SHOULD be
used, and the user MUST be allowed to control the process (including cancelling the
download and/or installation). If the MIDlet suite being installed is an update of the
currently running MIDlet suite, the platform MUST first stop the currently running MIDlet
suite before performing the update. On some platforms, the currently running MIDlet suite
MAY need to be stopped before any installations can occur.
If the URL specified is of the form tel:<number>, as specified in RFC2806, then the
platform MUST interpret this as a request to initiate a voice call. The request MUST be
passed to the "phone" application to handle if one is present in the platform. The "phone"
application, if present, MUST be able to set up local and global phone calls and also
perform DTMF post dialing. Not all elements of RFC2806 need be implemented,
especially the area-specifier or any other requirement on the terminal to know its context.
The isdn-subaddress, service-provider and future-extension may also be ignored. Pauses
during dialing are not relevant in some telephony services.
Devices MAY choose to support additional URL schemes beyond the requirements listed
above.
Many of the ways this method will be used could have a financial impact to the user
(e.g. transferring data through a wireless network, or initiating a voice call). Therefore the
platform MUST ask the user to explicitly acknowlege each request before the action is
taken. Implementation freedoms are possible so that a pleasant user experience is
retained. For example, some platforms may put up a dialog for each request asking the
user for permission, while other platforms may launch the appropriate application and
populate the URL or phone number fields, but not take the action until the user explicitly
clicks the load or dial buttons.
Parameters:
URL - The URL for the platform to load. An empty string (not null) cancels any pending requests.
Returns:
true if the MIDlet suite MUST first exit before the content can be fetched.
Throws:
ConnectionNotFoundException - if the platform cannot handle the URL requested.
Since:
MIDP 2.0use PushRegistry if you wanna call different MIDlets
or try C and C++ or SAVAJE mobile os
and you said that you have ever posted something but there's only one message registered
with your new OP's name...
edited by
supareno
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