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* as indicated by the @author tags. See the copyright.txt file in the
* distribution for a full listing of individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.infinispan.commands.remote;
import org.infinispan.CacheException;
import org.infinispan.container.DataContainer;
import org.infinispan.container.entries.CacheEntry;
import org.infinispan.container.entries.InternalCacheEntry;
import org.infinispan.context.InvocationContext;
import org.infinispan.context.InvocationContextContainer;
import org.infinispan.loaders.CacheLoaderManager;
import org.infinispan.util.logging.Log;
import org.infinispan.util.logging.LogFactory;
/**
* Issues a clustered get call, for use primarily by the {@link org.infinispan.loader.cluster.ClusterCacheLoader}. This
* is not a {@link org.infinispan.commands.VisitableCommand} and hence not passed up the {@link
* org.infinispan.interceptors.base.CommandInterceptor} chain.
* <p/>
*
* @author Mircea.Markus@jboss.com
* @since 4.0
*/
public class ClusteredGetCommand implements CacheRpcCommand {
public static final byte COMMAND_ID = 22;
private static final Log log = LogFactory.getLog(ClusteredGetCommand.class);
private static final boolean trace = log.isTraceEnabled();
private Object key;
private String cacheName;
private DataContainer dataContainer;
private CacheLoaderManager cacheLoaderManager;
private InvocationContextContainer icc;
public ClusteredGetCommand() {
}
public ClusteredGetCommand(Object key, String cacheName) {
this.key = key;
this.cacheName = cacheName;
}
public void initialize(DataContainer dataContainer, CacheLoaderManager clManager, InvocationContextContainer icc) {
this.dataContainer = dataContainer;
this.cacheLoaderManager = clManager;
this.icc = icc;
}
/**
* Invokes a logical "get(key)" on a remote cache and returns results.
*
* @param context invocation context, ignored.
* @return returns an <code>CacheEntry</code> or null, if no entry is found.
*/
public CacheEntry perform(InvocationContext context) throws Throwable {
if (key != null) {
InternalCacheEntry cacheEntry = dataContainer.get(key);
if (trace) log.trace("Found InternalCacheEntry {0} for key {1}", cacheEntry, key);
if (cacheEntry == null) {
if (trace) log.trace("Checking in cache loader");
// hack -> the call is here to make sure that the current thread is associated with
// the remote InvocationCOntext in order to make sure that ClusterCL won't trigger a recurring cluster get
// which might result in infinite loops
icc.createRemoteInvocationContext();
// lookup
if (cacheLoaderManager != null && cacheLoaderManager.getCacheLoader() != null) {
cacheEntry = cacheLoaderManager.getCacheLoader().load(key);
}
}
return cacheEntry;
} else {
throw new CacheException("Invalid command. Missing key!");
}
}
public byte getCommandId() {
return COMMAND_ID;
}
public Object[] getParameters() {
return new Object[]{key, cacheName};
}
public void setParameters(int commandId, Object[] args) {
key = args[0];
cacheName = (String) args[1];
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
ClusteredGetCommand that = (ClusteredGetCommand) o;
return !(key != null ? !key.equals(that.key) : that.key != null);
}
@Override
public int hashCode() {
int result;
result = (key != null ? key.hashCode() : 0);
return result;
}
@Override
public String toString() {
return "ClusteredGetCommand{" +
"key=" + key +
", dataContainer=" + dataContainer +
'}';
}
public String getCacheName() {
return cacheName;
}
}