Querying multiple caches parallely

Question

Hi experts,
I have multiple caches defined in client-cache config. And I wanted to query the differnt caches concurrently. If I use thread to do the job, it is going to be network call for each cache (I use TCP extend). Instead I want that to be handled inside the grid. Any suggestions on this?
I appreciate your valuable inputs.
Regards,
karthik

Answer 1

Hi karthik
Each cache access will be a network call, although they will all share the same TCP connection from the client to the server.
If you really just want everything to happen via a single call to the server you could use an invocation service. Configure an invocation-scheme on you server and a remote-invocation-scheme on the client and then write all the logic to access the caches in an Invocable.
For Example:
The server config:
<cache-config>
  <caching-scheme-mapping>
    <cache-mapping>
      <cache-name>dist-*</cache-name>
      <scheme-name>example-distributed</scheme-name>
    </cache-mapping>
  </caching-scheme-mapping>
  <caching-schemes>
    <invocation-scheme>
      <scheme-name>EXAMPLE-INVOCATION</scheme-name>
      <service-name>EXAMPLE-INVOCATION-SERVICE</service-name>
      <serializer>
        <class-name>com.tangosol.io.pof.ConfigurablePofContext</class-name>
      </serializer>
      <thread-count>5</thread-count>
      <autostart>true</autostart>
    </invocation-scheme>
    <proxy-scheme>
      <scheme-name>Example-Proxy</scheme-name>
      <service-name>EXAMPLE-PROXY-SERVICE</service-name>
      <thread-count>5</thread-count>
      <acceptor-config>
        <tcp-acceptor>
          <local-address>
            <address>localhost</address>
            <port>50115</port>
          </local-address>
        </tcp-acceptor>
        <serializer>
          <class-name>com.tangosol.io.pof.ConfigurablePofContext</class-name>
        </serializer>
      </acceptor-config>
      <proxy-config>
        <cache-service-proxy>
          <enabled>false</enabled>
        </cache-service-proxy>
        <invocation-service-proxy>
          <enabled>true</enabled>
        </invocation-service-proxy>
      </proxy-config>
      <autostart>true</autostart>
    </proxy-scheme>
  </caching-schemes>
</cache-config>The client config
<cache-config>
  <caching-scheme-mapping/>
  <caching-schemes>
    <remote-invocation-scheme>
      <scheme-name>EXAMPLE-INVOCATION-SERVICE-SCHEME</scheme-name>
      <service-name>EXAMPLE-INVOCATION-SERVICE</service-name>
      <initiator-config>
        <tcp-initiator>
          <remote-addresses>
            <socket-address>
              <address>localhost</address>
              <port>50115</port>
            </socket-address>
          </remote-addresses>
          <connect-timeout>2s</connect-timeout>
        </tcp-initiator>
        <outgoing-message-handler>
          <request-timeout>5s</request-timeout>
        </outgoing-message-handler>
        <serializer>
          <class-name>com.tangosol.io.pof.ConfigurablePofContext</class-name>
        </serializer>
      </initiator-config>
    </remote-invocation-scheme>
  </caching-schemes>
</cache-config>Example Invocable
public class CacheQuery extends AbstractInvocable implements PortableObject {
    public void run()
        Object result = ... // Perform your cache queries
        // set the results to pass back to the client
        setResult(result);       
    public void readExternal(PofReader pofReader) throws IOException {
        // Implement any POF deserialization
    public void writeExternal(PofWriter pofWriter) throws IOException {
        // Implement any POF serialization
}Example client code
InvocationService service = (InvocationService) CacheFactory.getService("EXAMPLE-INVOCATION-SERVICE");
CacheQuery invocable = new CacheQuery();
Object result = service.query(invocable, null);JK