4 Replies Latest reply on Aug 22, 2007 10:12 AM by Manik Surtani

    Can TcpDelegatingCacheLoader only delegate remove node?

    Ricardo Felipe Newbie

      Can TcpDelegatingCacheLoader only delegate remove operation?


        • 1. Re: Can TcpDelegatingCacheLoader only delegate remove node?
          Manik Surtani Master

          No.

          If you want this behaviour, subclass TDCL and override the methods you don't want operations for.

          • 3. Re: Can TcpDelegatingCacheLoader only delegate remove node?
            Ricardo Felipe Newbie

            Hey Manik I subclass TcpDelegatingCacheLoader in this way:



            package org.jboss.cache.loader.tcp;
            
            import java.util.Iterator;
            import java.util.List;
            import java.util.Map;
            import java.util.Set;
            
            import org.jboss.cache.Fqn;
            import org.jboss.cache.Modification;
            import org.jboss.cache.loader.DelegatingCacheLoader;
            
            public class MyTcpDelegatingCacheLoader extends TcpDelegatingCacheLoader {
            
             @Override
             protected void delegatePut(Fqn name, Map attributes) throws Exception {
             //nothing to do
             }
            
             @Override
             protected Object delegatePut(Fqn name, Object key, Object value) throws Exception {
             //nothing to do
             return null;
             }
            
            
             @Override
             protected Map delegateGet(Fqn arg0) throws Exception {
             return null;
             }
            
             @Override
             protected Set delegateGetChildrenNames(Fqn arg0) throws Exception {
             return null;
             }
            
             @Override
             protected void delegatePut(List modifications) throws Exception {
             synchronized (out)
             {
            
             out.reset();
             out.writeInt(DelegatingCacheLoader.putList);
             int length = modifications != null ? modifications.size() : 0;
             out.writeInt(length);
             if (length > 0)
             {
             for (Iterator it = modifications.iterator(); it.hasNext();)
             {
             Modification m = (Modification) it.next();
            
             if (m.getType() == Modification.REMOVE_NODE) { //added by me
             m.writeExternal(out);
             }
             }
             }
             out.flush();
             Object retval = in.readObject();
             if (retval instanceof Exception)
             throw(Exception) retval;
             }
            
             }
            
            
            }


            and I configure my Caches in this manner:
            TcpCacheServer

            <?xml version="1.0" encoding="UTF-8"?>
            
            <!-- ===================================================================== -->
            <!-- -->
            <!-- Sample PojoCache Service Configuration -->
            <!-- -->
            <!-- ===================================================================== -->
            
            <server>
            
             <!-- Used inside JBoss AS -->
             <classpath codebase="./lib" archives="jboss-cache-jdk50.jar, jgroups.jar"/>
            
             <!-- ==================================================================== -->
             <!-- Defines configuration -->
             <!-- ==================================================================== -->
            
             <mbean code="org.jboss.cache.aop.PojoCache"
             name="jboss.cache:service=BackEndCache">
            
             <!-- Used inside JBoss AS -->
             <depends>jboss:service=Naming</depends>
             <depends>jboss:service=TransactionManager</depends>
            
             <!--
             Configure the TransactionManager
            
             <attribute name="TransactionManagerLookupClass">org.jboss.cache.DummyTransactionManagerLookup</attribute>
             -->
             <attribute name="TransactionManagerLookupClass">org.jboss.cache.JBossTransactionManagerLookup</attribute>
             <!--
             Node locking scheme:
             OPTIMISTIC
             PESSIMISTIC (default)
             -->
             <attribute name="NodeLockingScheme">OPTIMISTIC</attribute>
            
             <!--
             Note that this attribute is IGNORED if your NodeLockingScheme above is OPTIMISTIC.
            
             Isolation level : SERIALIZABLE
             REPEATABLE_READ (default)
             READ_COMMITTED
             READ_UNCOMMITTED
             NONE
             -->
             <attribute name="IsolationLevel">REPEATABLE_READ</attribute>
            
             <!--
             Valid modes are LOCAL
             REPL_ASYNC
             REPL_SYNC
             INVALIDATION_ASYNC
             INVALIDATION_SYNC
             -->
             <attribute name="CacheMode">LOCAL</attribute>
             <!--
             <attribute name="UseInterceptorMbeans">true</attribute>
             -->
             <!-- Name of cluster. Needs to be the same for all clusters, in order
             to find each other
             -->
             <attribute name="ClusterName">BackEndCache-Cluster</attribute>
            
             <!-- JGroups protocol stack properties. Can also be a URL,
             e.g. file:/home/bela/default.xml
             <attribute name="ClusterProperties"></attribute>
             -->
             <!-- This ORIGINAL CONFIF OF JGROUPS -->
             <attribute name="ClusterConfig">
             <config>
             <!-- UDP: if you have a multihomed machine,
             set the bind_addr attribute to the appropriate NIC IP address -->
             <!-- UDP: On Windows machines, because of the media sense feature
             being broken with multicast (even after disabling media sense)
             set the loopback attribute to true -->
             <UDP mcast_addr="228.1.2.5" mcast_port="45577"
             ip_ttl="64" ip_mcast="true"
             mcast_send_buf_size="150000" mcast_recv_buf_size="80000"
             ucast_send_buf_size="150000" ucast_recv_buf_size="80000"
             loopback="false"/>
             <PING timeout="2000" num_initial_members="3"
             up_thread="false" down_thread="false"/>
             <MERGE2 min_interval="10000" max_interval="20000"/>
             <!-- <FD shun="true" up_thread="true" down_thread="true"/> -->
            
             <FD_SOCK/>
             <VERIFY_SUSPECT timeout="1500"
             up_thread="false" down_thread="false"/>
             <pbcast.NAKACK gc_lag="50" retransmit_timeout="600,1200,2400,4800"
             up_thread="false" down_thread="false"/>
             <pbcast.STABLE desired_avg_gossip="20000"
             up_thread="false" down_thread="false"/>
             <UNICAST timeout="600,1200,2400" window_size="100" min_threshold="10"
             down_thread="false"/>
             <FRAG frag_size="8192"
             down_thread="false" up_thread="false"/>
             <pbcast.GMS join_timeout="5000" join_retry_timeout="2000"
             shun="true" print_local_addr="true"/>
             <pbcast.STATE_TRANSFER up_thread="false" down_thread="false"/>
             </config>
             </attribute>
            
            
             <!--
             The max amount of time (in milliseconds) we wait until the
             initial state (ie. the contents of the cache) are retrieved from
             existing members in a clustered environment
             -->
             <attribute name="InitialStateRetrievalTimeout">20000</attribute>
            
             <!--
             Number of milliseconds to wait until all responses for a
             synchronous call have been received.
             -->
             <attribute name="SyncReplTimeout">15000</attribute>
            
             <!-- Max number of milliseconds to wait for a lock acquisition -->
             <attribute name="LockAcquisitionTimeout">10000</attribute>
            
             <!--
             <attribute name="EvictionPolicyClass"></attribute>
             -->
            
             <!-- Name of the eviction policy class. We have commented it off to disable eviction.
             -->
             <attribute name="EvictionPolicyClass">org.jboss.cache.aop.eviction.AopLRUPolicy</attribute>
            
             <!-- Specific eviction policy configurations. This is LRU -->
             <attribute name="EvictionPolicyConfig">
             <config>
             <attribute name="wakeUpIntervalSeconds">5</attribute>
             <!-- Cache wide default -->
             <region name="/_default_">
             <attribute name="maxNodes">1000</attribute>
             <attribute name="timeToLiveSeconds">600</attribute>
             <attribute name="maxAgeSeconds">1200</attribute>>
             </region>
             <!--
            
             <region name="/aop">
             <attribute name="maxNodes">5</attribute>
             <attribute name="timeToLiveSeconds">4</attribute>
             </region>
             <region name="/pojo">
             <attribute name="maxNodes">100</attribute>
             <attribute name="timeToLiveSeconds">4</attribute>
             </region>
             <region name="/testMaxNode">
             <attribute name="maxNodes">4</attribute>
             <attribute name="timeToLiveSeconds">100</attribute>
             </region> -->
             </config>
             </attribute>
             </mbean>
            
             <mbean code="org.jboss.cache.loader.tcp.TcpCacheServer" name="jboss.cache:service=TcpCacheServer">
             <depends optional-attribute-name="Cache"
             proxy-type="attribute">jboss.cache:service=BackEndCache</depends>
             <attribute name="BindAddress">${jboss.bind.address:localhost}</attribute>
             <attribute name="Port">7500</attribute>
             <attribute name="MBeanServerName"></attribute>
             <!--<attribute name="CacheName">jboss.cache:service=TreeCache</attribute>-->
             </mbean>
            </server>




            TcpDelegatingCacheLoader


            <?xml version="1.0" encoding="UTF-8"?>
            
            <!-- ===================================================================== -->
            <!-- -->
            <!-- Sample PojoCache Service Configuration -->
            <!-- -->
            <!-- ===================================================================== -->
            
            <server>
            
             <!-- Used inside JBoss AS -->
             <classpath codebase="./lib" archives="jboss-cache-jdk50.jar, jgroups.jar"/>
            
             <!-- ==================================================================== -->
             <!-- Defines configuration -->
             <!-- ==================================================================== -->
            
             <mbean code="org.jboss.cache.aop.PojoCache"
             name="jboss.cache:service=DelegatingCacheLoader">
            
             <!-- Used inside JBoss AS -->
             <depends>jboss:service=Naming</depends>
             <depends>jboss:service=TransactionManager</depends>
            
             <!--
             Configure the TransactionManager
            
             <attribute name="TransactionManagerLookupClass">org.jboss.cache.DummyTransactionManagerLookup</attribute>
             -->
             <attribute name="TransactionManagerLookupClass">org.jboss.cache.JBossTransactionManagerLookup</attribute>
            
             <!--
             Node locking scheme:
             OPTIMISTIC
             PESSIMISTIC (default)
             -->
             <attribute name="NodeLockingScheme">OPTIMISTIC</attribute>
            
             <!--
             Note that this attribute is IGNORED if your NodeLockingScheme above is OPTIMISTIC.
            
             Isolation level : SERIALIZABLE
             REPEATABLE_READ (default)
             READ_COMMITTED
             READ_UNCOMMITTED
             NONE
             -->
             <attribute name="IsolationLevel">REPEATABLE_READ</attribute>
            
             <!--
             Valid modes are LOCAL
             REPL_ASYNC
             REPL_SYNC
             INVALIDATION_ASYNC
             INVALIDATION_SYNC
             -->
             <attribute name="CacheMode">LOCAL</attribute>
            
             <!-- Name of cluster. Needs to be the same for all clusters, in order
             to find each other
             -->
             <attribute name="ClusterName">DelegatingCacheLoader-Cluster</attribute>
            
             <!-- JGroups protocol stack properties. Can also be a URL,
             e.g. file:/home/bela/default.xml
             <attribute name="ClusterProperties"></attribute>
             -->
             <!-- This ORIGINAL CONFIF OF JGROUPS -->
             <attribute name="ClusterConfig">
             <config>
             <!-- UDP: if you have a multihomed machine,
             set the bind_addr attribute to the appropriate NIC IP address -->
             <!-- UDP: On Windows machines, because of the media sense feature
             being broken with multicast (even after disabling media sense)
             set the loopback attribute to true -->
             <UDP mcast_addr="228.1.2.3" mcast_port="48866"
             ip_ttl="64" ip_mcast="true"
             mcast_send_buf_size="150000" mcast_recv_buf_size="80000"
             ucast_send_buf_size="150000" ucast_recv_buf_size="80000"
             loopback="false"/>
             <PING timeout="2000" num_initial_members="3"
             up_thread="false" down_thread="false"/>
             <MERGE2 min_interval="10000" max_interval="20000"/>
             <!-- <FD shun="true" up_thread="true" down_thread="true"/> -->
            
             <FD_SOCK/>
             <VERIFY_SUSPECT timeout="1500"
             up_thread="false" down_thread="false"/>
             <pbcast.NAKACK gc_lag="50" retransmit_timeout="600,1200,2400,4800"
             up_thread="false" down_thread="false"/>
             <pbcast.STABLE desired_avg_gossip="20000"
             up_thread="false" down_thread="false"/>
             <UNICAST timeout="600,1200,2400" window_size="100" min_threshold="10"
             down_thread="false"/>
             <FRAG frag_size="8192"
             down_thread="false" up_thread="false"/>
             <pbcast.GMS join_timeout="5000" join_retry_timeout="2000"
             shun="true" print_local_addr="true"/>
             <pbcast.STATE_TRANSFER up_thread="false" down_thread="false"/>
             </config>
             </attribute>
            
             <!--
             The max amount of time (in milliseconds) we wait until the
             initial state (ie. the contents of the cache) are retrieved from
             existing members in a clustered environment
             -->
             <attribute name="InitialStateRetrievalTimeout">20000</attribute>
            
             <!--
             Number of milliseconds to wait until all responses for a
             synchronous call have been received.
             -->
             <attribute name="SyncReplTimeout">15000</attribute>
            
             <!-- Max number of milliseconds to wait for a lock acquisition -->
             <attribute name="LockAcquisitionTimeout">10000</attribute>
            
             <!--
             <attribute name="EvictionPolicyClass"></attribute>
             -->
            
             <!-- Name of the eviction policy class. We have commented it off to disable eviction.
             -->
             <attribute name="EvictionPolicyClass">org.jboss.cache.aop.eviction.AopLRUPolicy</attribute>
            
             <!-- Specific eviction policy configurations. This is LRU -->
             <attribute name="EvictionPolicyConfig">
             <config>
             <attribute name="wakeUpIntervalSeconds">5</attribute>
             <!-- Cache wide default -->
             <region name="/_default_">
             <attribute name="maxNodes">1000</attribute>
             <attribute name="timeToLiveSeconds">600</attribute>
             <attribute name="maxAgeSeconds">1200</attribute>>
             </region>
             <!--
             <region name="/aop">
             <attribute name="maxNodes">5</attribute>
             <attribute name="timeToLiveSeconds">4</attribute>
             </region>
             <region name="/pojo">
             <attribute name="maxNodes">100</attribute>
             <attribute name="timeToLiveSeconds">4</attribute>
             </region>
             <region name="/testMaxNode">
             <attribute name="maxNodes">4</attribute>
             <attribute name="timeToLiveSeconds">100</attribute>
             </region> -->
             </config>
             </attribute>
             <attribute name="CacheLoaderConfiguration">
             <config>
             <cacheloader>
             <class>org.jboss.cache.loader.tcp.MyTcpDelegatingCacheLoader</class>
             <!--<class>com.procyonsoluciones.mobistore.core.commom.cache.TcpDelegatingCache</class> -->
             <properties>
             host=localhost
             port=7500
             </properties>
             <ignoreModifications>true</ignoreModifications>
             </cacheloader>
             </config>
             </attribute>
             </mbean>
            
            </server>



            Later I try to store an object in my DelegatingCacheLoader through JMX Console (key= name, value = myname) and when i invoke the put Operation in DelegatingCacheLoader service this never end, it seems to be waiting for something. No error message is thrown. did I some wrong or i need to configure something else?

            Thanks in advance

            • 4. Re: Can TcpDelegatingCacheLoader only delegate remove node?
              Manik Surtani Master

              get and getChildrenNames should return empty collections, not nulls. Nulls imply that the node in question does not exist.