package org.infinispan.persistence.cluster;
import org.infinispan.AdvancedCache;
import org.infinispan.commands.remote.ClusteredGetCommand;
import org.infinispan.commons.configuration.ConfiguredBy;
import org.infinispan.commons.util.InfinispanCollections;
import org.infinispan.configuration.cache.ClusterLoaderConfiguration;
import org.infinispan.container.entries.InternalCacheValue;
import org.infinispan.context.Flag;
import org.infinispan.lifecycle.ComponentStatus;
import org.infinispan.persistence.spi.LocalOnlyCacheLoader;
import org.infinispan.persistence.spi.PersistenceException;
import org.infinispan.persistence.spi.CacheLoader;
import org.infinispan.persistence.spi.InitializationContext;
import org.infinispan.marshall.core.MarshalledEntry;
import org.infinispan.remoting.responses.ClusteredGetResponseValidityFilter;
import org.infinispan.remoting.responses.Response;
import org.infinispan.remoting.responses.SuccessfulResponse;
import org.infinispan.remoting.rpc.ResponseFilter;
import org.infinispan.remoting.rpc.ResponseMode;
import org.infinispan.remoting.rpc.RpcManager;
import org.infinispan.remoting.rpc.RpcOptions;
import org.infinispan.remoting.transport.Address;
import org.infinispan.util.logging.Log;
import org.infinispan.util.logging.LogFactory;
import java.util.Collection;
import java.util.HashSet;
import java.util.Set;
import java.util.concurrent.TimeUnit;
/**
* Cache loader that consults other members in the cluster for values. A <code>remoteCallTimeout</code> property is
* required, a <code>long</code> that specifies in milliseconds how long to wait for results before returning a null.
*
* @author Mircea.Markus@jboss.com
*/
@ConfiguredBy(ClusterLoaderConfiguration.class)
public class ClusterLoader implements CacheLoader, LocalOnlyCacheLoader {
private static final Log log = LogFactory.getLog(ClusterLoader.class);
private RpcManager rpcManager;
private AdvancedCache<?, ?> cache;
private ClusterLoaderConfiguration configuration;
private InitializationContext ctx;
@Override
public void init(InitializationContext ctx) {
this.ctx = ctx;
cache = ctx.getCache().getAdvancedCache();
rpcManager = cache.getRpcManager();
this.configuration = ctx.getConfiguration();
}
@Override
public MarshalledEntry load(Object key) throws PersistenceException {
if (!isCacheReady()) return null;
ClusteredGetCommand clusteredGetCommand = new ClusteredGetCommand(
key, cache.getName(), InfinispanCollections.<Flag>emptySet(), false, null,
cache.getCacheConfiguration().dataContainer().keyEquivalence());
Collection<Response> responses = doRemoteCall(clusteredGetCommand);
if (responses.isEmpty()) return null;
Response response;
if (responses.size() > 1) {
// Remove duplicates before deciding if multiple responses were received
Set<Response> setResponses = new HashSet<Response>(responses);
if (setResponses.size() > 1)
throw new PersistenceException(String.format(
"Responses contains more than 1 element and these elements are not equal, so can't decide which one to use: %s",
setResponses));
response = setResponses.iterator().next();
} else {
response = responses.iterator().next();
}
if (response.isSuccessful() && response instanceof SuccessfulResponse) {
InternalCacheValue value = (InternalCacheValue) ((SuccessfulResponse) response).getResponseValue();
return value == null ? null :
ctx.getMarshalledEntryFactory().newMarshalledEntry(key, value.getValue(), null);
}
log.unknownResponsesFromRemoteCache(responses);
throw new PersistenceException("Unknown responses");
}
@Override
public boolean contains(Object key) {
return load(key) != null;
}
@Override
public void start() {
//nothing to do here
}
@Override
public void stop() {
//nothing to do here
}
private Collection<Response> doRemoteCall(ClusteredGetCommand clusteredGetCommand) throws PersistenceException {
Set<Address> members = new HashSet<Address>(rpcManager.getTransport().getMembers());
Address self = rpcManager.getTransport().getAddress();
ResponseFilter filter = new ClusteredGetResponseValidityFilter(members, self);
try {
RpcOptions options = rpcManager.getRpcOptionsBuilder(ResponseMode.WAIT_FOR_VALID_RESPONSE)
.timeout(configuration.remoteCallTimeout(), TimeUnit.MILLISECONDS).responseFilter(filter).build();
return rpcManager.invokeRemotely(null, clusteredGetCommand, options).values();
} catch (Exception e) {
log.errorDoingRemoteCall(e);
throw new PersistenceException(e);
}
}
/**
* A test to check whether the cache is in its started state. If not, calls should not be made as the channel may
* not have properly started, blocks due to state transfers may be in progress, etc.
*
* @return true if the cache is in its STARTED state.
*/
protected boolean isCacheReady() {
return cache.getStatus() == ComponentStatus.RUNNING;
}
}