Listening to specific keys...

So I currently am going something that was suggested to me earlier for listening on a .NET client for changes on a Tangosol Cache and it's working great. Now I want to go one step further and begin to listen to some specific items in the cache, and not the whole general cache, and I have some questions...
First off, my current listener section looks like this:
cacheListener = new WindowsFormsCacheListener(this);
cacheListener.EntryInserted += new CacheEventHandler(CacheAdd);
cacheListener.EntryUpdated += new CacheEventHandler(CacheUpdate);
cacheListener.EntryDeleted += new CacheEventHandler(CacheRemoved);
theCache.AddCacheListener(cacheListener);
Now I need to see additions to the cache, but I would like to listen to updates only for those things that I subscribe to. So, my question is this: If I change my code to looking something like this:
cacheListener = new WindowsFormsCacheListener(this);
cacheListener.EntryInserted += new CacheEventHandler(CacheAdd);
cacheListener.EntryUpdated += new CacheEventHandler(CacheUpdate);
cacheListener.EntryDeleted += new CacheEventHandler(CacheRemoved);
theCache.AddCacheListener(cacheListener, key1, false);
theCache.AddCacheListener(cacheListener, key2, false);
theCache.AddCacheListener(cacheListener, keyN, false);
will I still get events when something is added to the cache that I have not subscribed to? Or should I not specify a CacheEventHandler for addition to things I know to be in the cache and I want to listen to, and apply JUST a CacheEventHandler to the cache as a whole for when something is added, and just determine whether I want to listen to that new entry, or not... such as:
cacheAdditionListener = new WindowsFormsCacheListener(this);
cacheAdditionListener.EntryInserted += new CacheEventHandler(CacheAdd);
theCache.AddCacheListener(cacheAdditionListener);
cacheListener = new WindowsFormsCacheListener(this);
cacheListener.EntryUpdated += new CacheEventHandler(CacheUpdate);
cacheListener.EntryDeleted += new CacheEventHandler(CacheRemoved);
theCache.AddCacheListener(cacheListener, key1, false);
theCache.AddCacheListener(cacheListener, key2, false);
theCache.AddCacheListener(cacheListener, keyN, false);
Any clarification will be helpful, and thank you!
Edit: Made the code sections bold for easy reading

Hi Kevek,
How do you determine whether or not an item added to the cache is of interest to your application? If you can programatically describe the "shape" of interesting items, you can use the IFilter-based AddMapListener methods to register interest in all items that match a given IFilter. See:
http://wiki.tangosol.com/display/COHNET33/Configuration+and+Usage#ConfigurationandUsage-IObservableCache
For example, the following code will register an ICacheListener which will receive heavy events pertaining to any item keyed by a string that starts with "key":
cache.AddCacheListener(listener, new LikeFilter("getKey", "key%"), false);
Regards,
Jason

Similar Messages

Huge performance differences between a map listener for a key and filter

Hi all,
I wanted to test different kind of map listener available in Coherence 3.3.1 as I would like to use it as an event bus. The result was that I found huge performance differences between them. In my use case, I have data which are time stamped so the full key of the data is the key which identifies its type and the time stamp. Unfortunately, when I had my map listener to the cache, I only know the type id but not the time stamp, thus I cannot add a listener for a key but for a filter which will test the value of the type id. When I launch my test, I got terrible performance results then I tried a listener for a key which gave me much better results but in my case I cannot use it.
Here are my results with a Dual Core of 2.13 GHz
1) Map Listener for a Filter
a) No Index
Create (data always added, the key is composed by the type id and the time stamp)
Cache.put
Test 1: Total 42094 millis, Avg 1052, Total Tries 40, Cache Size 80000
Cache.putAll
Test 2: Total 43860 millis, Avg 1096, Total Tries 40, Cache Size 80000
Update (data added then updated, the key is only composed by the type id)
Cache.put
Test 3: Total 56390 millis, Avg 1409, Total Tries 40, Cache Size 2000
Cache.putAll
Test 4: Total 51734 millis, Avg 1293, Total Tries 40, Cache Size 2000
b) With Index
Cache.put
Test 5: Total 39594 millis, Avg 989, Total Tries 40, Cache Size 80000
Cache.putAll
Test 6: Total 43313 millis, Avg 1082, Total Tries 40, Cache Size 80000
Update
Cache.put
Test 7: Total 55390 millis, Avg 1384, Total Tries 40, Cache Size 2000
Cache.putAll
Test 8: Total 51328 millis, Avg 1283, Total Tries 40, Cache Size 2000
2) Map Listener for a Key
Update
Cache.put
Test 9: Total 3937 millis, Avg 98, Total Tries 40, Cache Size 2000
Cache.putAll
Test 10: Total 1078 millis, Avg 26, Total Tries 40, Cache Size 2000
Please help me to find what is wrong with my code because for now it is unusable.
Best Regards,
Nicolas
Here is my code
import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import com.tangosol.io.ExternalizableLite;
import com.tangosol.net.CacheFactory;
import com.tangosol.net.NamedCache;
import com.tangosol.util.Filter;
import com.tangosol.util.MapEvent;
import com.tangosol.util.MapListener;
import com.tangosol.util.extractor.ReflectionExtractor;
import com.tangosol.util.filter.EqualsFilter;
import com.tangosol.util.filter.MapEventFilter;
public class TestFilter {
      * To run a specific test, just launch the program with one parameter which
      * is the test index
     public static void main(String[] args) {
          if (args.length != 1) {
               System.out.println("Usage : java TestFilter 1-10|all");
               System.exit(1);
          final String arg = args[0];
          if (arg.endsWith("all")) {
               for (int i = 1; i <= 10; i++) {
                    test(i);
          } else {
               final int testIndex = Integer.parseInt(args[0]);
               if (testIndex < 1 || testIndex > 10) {
                    System.out.println("Usage : java TestFilter 1-10|all");
                    System.exit(1);
               test(testIndex);
     @SuppressWarnings("unchecked")
     private static void test(int testIndex) {
          final NamedCache cache = CacheFactory.getCache("test-cache");
          final int totalObjects = 2000;
          final int totalTries = 40;
          if (testIndex >= 5 && testIndex <= 8) {
               // Add index
               cache.addIndex(new ReflectionExtractor("getKey"), false, null);
          // Add listeners
          for (int i = 0; i < totalObjects; i++) {
               final MapListener listener = new SimpleMapListener();
               if (testIndex < 9) {
                    // Listen to data with a given filter
                    final Filter filter = new EqualsFilter("getKey", i);
                    cache.addMapListener(listener, new MapEventFilter(filter), false);
               } else {
                    // Listen to data with a given key
                    cache.addMapListener(listener, new TestObjectSimple(i), false);
          // Load data
          long time = System.currentTimeMillis();
          for (int iTry = 0; iTry < totalTries; iTry++) {
               final long currentTime = System.currentTimeMillis();
               final Map<Object, Object> buffer = new HashMap<Object, Object>(totalObjects);
               for (int i = 0; i < totalObjects; i++) {
                    final Object obj;
                    if (testIndex == 1 || testIndex == 2 || testIndex == 5 || testIndex == 6) {
                         // Create data with key with time stamp
                         obj = new TestObjectComplete(i, currentTime);
                    } else {
                         // Create data with key without time stamp
                         obj = new TestObjectSimple(i);
                    if ((testIndex & 1) == 1) {
                         // Load data directly into the cache
                         cache.put(obj, obj);
                    } else {
                         // Load data into a buffer first
                         buffer.put(obj, obj);
               if (!buffer.isEmpty()) {
                    cache.putAll(buffer);
          time = System.currentTimeMillis() - time;
          System.out.println("Test " + testIndex + ": Total " + time + " millis, Avg " + (time / totalTries) + ", Total Tries " + totalTries + ", Cache Size " + cache.size());
          cache.destroy();
     public static class SimpleMapListener implements MapListener {
          public void entryDeleted(MapEvent evt) {}
          public void entryInserted(MapEvent evt) {}
          public void entryUpdated(MapEvent evt) {}
     public static class TestObjectComplete implements ExternalizableLite {
          private static final long serialVersionUID = -400722070328560360L;
          private int key;
          private long time;
          public TestObjectComplete() {}
          public TestObjectComplete(int key, long time) {
               this.key = key;
               this.time = time;
          public int getKey() {
               return key;
          public void readExternal(DataInput in) throws IOException {
               this.key = in.readInt();
               this.time = in.readLong();
          public void writeExternal(DataOutput out) throws IOException {
               out.writeInt(key);
               out.writeLong(time);
     public static class TestObjectSimple implements ExternalizableLite {
          private static final long serialVersionUID = 6154040491849669837L;
          private int key;
          public TestObjectSimple() {}
          public TestObjectSimple(int key) {
               this.key = key;
          public int getKey() {
               return key;
          public void readExternal(DataInput in) throws IOException {
               this.key = in.readInt();
          public void writeExternal(DataOutput out) throws IOException {
               out.writeInt(key);
          public int hashCode() {
               return key;
          public boolean equals(Object o) {
               return o instanceof TestObjectSimple && key == ((TestObjectSimple) o).key;
}Here is my coherence config file
<?xml version="1.0"?>
<!DOCTYPE cache-config SYSTEM "cache-config.dtd">
<cache-config>
     <caching-scheme-mapping>
          <cache-mapping>
               <cache-name>test-cache</cache-name>
               <scheme-name>default-distributed</scheme-name>
          </cache-mapping>
     </caching-scheme-mapping>
     <caching-schemes>
          <distributed-scheme>
               <scheme-name>default-distributed</scheme-name>
               <backing-map-scheme>
                    <class-scheme>
                         <scheme-ref>default-backing-map</scheme-ref>
                    </class-scheme>
               </backing-map-scheme>
          </distributed-scheme>
          <class-scheme>
               <scheme-name>default-backing-map</scheme-name>
               <class-name>com.tangosol.util.SafeHashMap</class-name>
          </class-scheme>
     </caching-schemes>
</cache-config>Message was edited by:
user620763

Hi Robert,
Indeed, only the Filter.evaluate(Object obj)
method is invoked, but the object passed to it is a
MapEvent.<< In fact, I do not need to implement EntryFilter to
get a MapEvent, I could get the same result (in my
last message) by writting
cache.addMapListener(listener, filter,
true)instead of
cache.addMapListener(listener, new
MapEventFilter(filter) filter, true)
I believe, when the MapEventFilter delegates to your filter it always passes a value object to your filter (old or new), meaning a value will be deserialized.
If you instead used your own filter, you could avoid deserializing the value which usually is much larger, and go to only the key object. This would of course only be noticeable if you indeed used a much heavier cached value class.
The hashCode() and equals() does not matter on
the filter class<< I'm not so sure since I noticed that these methods
were implemented in the EqualsFilter class, that they
are called at runtime and that the performance
results are better when you add them
That interests me... In what circumstances did you see them invoked? On the storage node before sending an event, or upon registering a filtered listener?
If the second, then I guess the listeners are stored in a hash-based map of collections keyed by a filter, and indeed that might be relevant as in that case it will cause less passes on the filter for multiple listeners with an equalling filter.
DataOutput.writeInt(int) writes 4 bytes.
ExternalizableHelper.writeInt(DataOutput, int) writes
1-5 bytes (or 1-6?), with numbers with small absolute
values consuming less bytes.Similar differences exist
for the long type as well, but your stamp attribute
probably will be a large number...<< I tried it but in my use case, I got the same
results. I guess that it must be interesting, if I
serialiaze/deserialiaze many more objects.
Also, if Coherence serializes an
ExternalizableLite object, it writes out its
class-name (except if it is a Coherence XmlBean). If
you define your key as an XmlBean, and add your class
into the classname cache configuration in
ExternalizableHelper.xml, then instead of the
classname, only an int will be written. This way you
can spare a large percentage of bandwidth consumed by
transferring your key instance as it has only a small
number of attributes. For the value object, it might
or might not be so relevant, considering that it will
probably contain many more attributes. However, in
case of a lite event, the value is not transferred at
all.<< I tried it too and in my use case, I noticed that
we get objects nearly twice lighter than an
ExternalizableLite object but it's slower to get
them. But it is very intersting to keep in mind, if
we would like to reduce the network traffic.
Yes, these are minor differences at the moment.
As for the performance of XMLBean, it is a hack, but you might try overriding the readExternal/writeExternal method with your own usual ExternalizableLite implementation stuff. That way you get the advantages of the xmlbean classname cache, and avoid its reflection-based operation, at the cost of having to extend XMLBean.
Also, sooner or later the TCMP protocol and the distributed cache storages will also support using PortableObject as a transmission format, which enables using your own classname resolution and allow you to omit the classname from your objects. Unfortunately, I don't know when it will be implemented.
>
But finally, I guess that I found the best solution
for my specific use case which is to use a map
listener for a key which has no time stamp, but since
the time stamp is never null, I had just to check
properly the time stamp in the equals method.
I would still recommend to use a separate key class, use a custom filter which accesses only the key and not the value, and if possible register a lite listener instead of a heavy one. Try it with a much heavier cached value class where the differences are more pronounced.
Best regards,
Robert

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Hi,
We have created a "Customer-Specific Key Figures" in customizing and mapped the key with value category. But this new defined key figure is not available in the report MCI3.
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Vasim wrote:
Hi Robert,
You are right. But The object "myVar" which I am trying to look upis not in
the JNDI tree nor am I interesed in binding it . But my requirementis that
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dont want to have a separare config file for this..and hence the question..So, put the properties you want in the jndi.properties file and load
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ClassLoader cl = Thread.currentThread().getContextClassLoader();
if (cl == null)
cl = System.getSystemClassLoader();
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props.load(is);
Personally, I would not use this file and would create an application-specific
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btw, is jndi.properties only for those objects which are bound to jnditree?
jndi.properties is only used for creating the JNDI InitialContext. The
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but inside the server, you only need to do this because the server is
the provider
and already knows how to connect to itself:
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code that sets up the properties to be passed to the InitialContext constructor
so
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Hello,
Can I specify my application specific key-value pair in jndi.properties?
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If your key is not registered to generate an event I don't see the problem.
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The normal event model, as far as I can tell, is to wake up on keypressed and then check which key it was that has been pressed and respond accordingly.

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Thanks Jonathan for your timely response will look into the Map event, but just a quick question
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Will look into the Map Event in detail.
Thanks Again,
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from a .CSV file.
What I want to do is to efficiently parse each String variable searching for any occurrence(s) of the Key words held in the array and substituting with their replacement.
I know I can use "standard" VB code to do this but my instinct tells me that using Regular Expressions might be far more efficient.
Never having attempted to use Regular Expressions before, but having just spent several hours attempting to research the subject online, I know I need some help, please.
Any advice or guidance will be gratefully received.
Paul J

Hello,
The 'Suggestions and Feedback for the Forums' forum is to give users a voice on Forums. Users can give suggestions for improvements or vote up suggestions and know that the Forums team is listening.
I'd ask in the
Visual Basic .Net Language forum on MSDN.
Karl
When you see answers and helpful posts, please click Vote As Helpful, Propose As Answer, and/or Mark As Answer.
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Organizing and listening to specific playlists completely..

I want to listen to my music by folder/genre. As in if I have a classic rock folder/playlist, I want to be able to select that "folder" on my ipod and listen to all the music I have denoted as "classic rock" then maybe move onto "pop" folder and listen to all the music that I have loaded as pop. I don't like how my ipod randomly plays/chooses the music I listen to.. The first song might be rock, the next pop, and so on. Can anyone please tell me how to organize and listen to my music by folder or genre.
When I download my music it gets assigned a specific name, usually with numbers. I know that it's for example a 38 special song, so I put into my classic rock folder on itunes. When I turn on my ipod and go to my classic rock folder, the song is not there.
Windows XP

iTunes organizes songs into folders by Artist -> Album
Do you mean it is in a playlist you created in the Source on the left side of iTunes?
If you want to play a specific Genre, on the iPod select Music -> Genre, select the one you want and press pplay.

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