package org.infinispan.interceptors.distribution;
import org.infinispan.commands.FlagAffectedCommand;
import org.infinispan.commands.remote.ClusteredGetCommand;
import org.infinispan.commands.write.DataWriteCommand;
import org.infinispan.commands.write.WriteCommand;
import org.infinispan.commons.CacheException;
import org.infinispan.container.entries.InternalCacheEntry;
import org.infinispan.container.entries.InternalCacheValue;
import org.infinispan.context.InvocationContext;
import org.infinispan.context.impl.TxInvocationContext;
import org.infinispan.distribution.DistributionManager;
import org.infinispan.factories.annotations.Inject;
import org.infinispan.interceptors.ClusteringInterceptor;
import org.infinispan.interceptors.locking.ClusteringDependentLogic;
import org.infinispan.remoting.RemoteException;
import org.infinispan.remoting.responses.CacheNotFoundResponse;
import org.infinispan.remoting.responses.ClusteredGetResponseValidityFilter;
import org.infinispan.remoting.responses.ExceptionResponse;
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.RpcOptions;
import org.infinispan.remoting.transport.Address;
import org.infinispan.statetransfer.OutdatedTopologyException;
import org.infinispan.transaction.xa.GlobalTransaction;
import org.infinispan.util.logging.Log;
import org.infinispan.util.logging.LogFactory;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.Set;
/**
* Base class for distribution of entries across a cluster.
*
* @author Manik Surtani
* @author Mircea.Markus@jboss.com
* @author Pete Muir
* @author Dan Berindei <dan@infinispan.org>
* @since 4.0
*/
public abstract class BaseDistributionInterceptor extends ClusteringInterceptor {
protected DistributionManager dm;
protected ClusteringDependentLogic cdl;
private static final Log log = LogFactory.getLog(BaseDistributionInterceptor.class);
@Override
protected Log getLog() {
return log;
}
@Inject
public void injectDependencies(DistributionManager distributionManager, ClusteringDependentLogic cdl) {
this.dm = distributionManager;
this.cdl = cdl;
}
@Override
protected final InternalCacheEntry retrieveFromRemoteSource(Object key, InvocationContext ctx, boolean acquireRemoteLock, FlagAffectedCommand command, boolean isWrite) throws Exception {
GlobalTransaction gtx = ctx.isInTxScope() ? ((TxInvocationContext)ctx).getGlobalTransaction() : null;
ClusteredGetCommand get = cf.buildClusteredGetCommand(key, command.getFlags(), acquireRemoteLock, gtx);
get.setWrite(isWrite);
List<Address> targets = new ArrayList<Address>(stateTransferManager.getCacheTopology().getReadConsistentHash().locateOwners(key));
// if any of the recipients has left the cluster since the command was issued, just don't wait for its response
targets.retainAll(rpcManager.getTransport().getMembers());
ResponseFilter filter = new ClusteredGetResponseValidityFilter(targets, rpcManager.getAddress());
RpcOptions options = rpcManager.getRpcOptionsBuilder(ResponseMode.WAIT_FOR_VALID_RESPONSE, false)
.responseFilter(filter).build();
Map<Address, Response> responses = rpcManager.invokeRemotely(targets, get, options);
if (!responses.isEmpty()) {
for (Response r : responses.values()) {
if (r instanceof SuccessfulResponse) {
// The response value might be null.
SuccessfulResponse response = (SuccessfulResponse)r;
if( response.getResponseValue() == null )
return null;
InternalCacheValue cacheValue = (InternalCacheValue) response.getResponseValue();
return cacheValue.toInternalCacheEntry(key);
}
}
}
// TODO If everyone returned null, and the read CH has changed, retry the remote get.
// Otherwise our get command might be processed by the old owners after they have invalidated their data
// and we'd return a null even though the key exists on
return null;
}
protected final Object handleNonTxWriteCommand(InvocationContext ctx, DataWriteCommand command) throws Throwable {
if (ctx.isInTxScope()) {
throw new CacheException("Attempted execution of non-transactional write command in a transactional invocation context");
}
RecipientGenerator recipientGenerator = new SingleKeyRecipientGenerator(command.getKey());
// see if we need to load values from remote sources first
remoteGetBeforeWrite(ctx, command, recipientGenerator);
// if this is local mode then skip distributing
if (isLocalModeForced(command)) {
return invokeNextInterceptor(ctx, command);
}
boolean isSync = isSynchronous(command);
Address primaryOwner = cdl.getPrimaryOwner(command.getKey());
int commandTopologyId = command.getTopologyId();
int currentTopologyId = stateTransferManager.getCacheTopology().getTopologyId();
// TotalOrderStateTransferInterceptor doesn't set the topology id for PFERs.
// TODO Shouldn't PFERs be executed in a tx with total order?
if (isSync && currentTopologyId != commandTopologyId && commandTopologyId != -1) {
log.tracef("Cache topology changed while the command was executing: expected %d, got %d",
commandTopologyId, currentTopologyId);
throw new OutdatedTopologyException("Cache topology changed while the command was executing: expected " +
commandTopologyId + ", got " + currentTopologyId);
}
if (!ctx.isOriginLocal()) {
Object returnValue = invokeNextInterceptor(ctx, command);
if (primaryOwner.equals(rpcManager.getAddress())) {
if (!command.isSuccessful()) {
log.tracef("Skipping the replication of the conditional command as it did not succeed on primary owner (%s).", command);
return returnValue;
}
command.setIgnorePreviousValue(true);
rpcManager.invokeRemotely(recipientGenerator.generateRecipients(), command, rpcManager.getDefaultRpcOptions(isSync));
}
return returnValue;
} else {
if (primaryOwner.equals(rpcManager.getAddress())) {
Object result = invokeNextInterceptor(ctx, command);
if (!command.isSuccessful()) {
log.tracef("Skipping the replication of the command as it did not succeed on primary owner (%s).", command);
return result;
}
List<Address> recipients = recipientGenerator.generateRecipients();
log.tracef("I'm the primary owner, sending the command to all the backups (%s) in order to be applied.",
recipients);
// check if a single owner has been configured and the target for the key is the local address
boolean isSingleOwnerAndLocal = cacheConfiguration.clustering().hash().numOwners() == 1;
if (!isSingleOwnerAndLocal) {
command.setIgnorePreviousValue(true);
rpcManager.invokeRemotely(recipients, command, rpcManager.getDefaultRpcOptions(isSync));
}
return result;
} else {
log.tracef("I'm not the primary owner, so sending the command to the primary owner(%s) in order to be forwarded", primaryOwner);
Object localResult = invokeNextInterceptor(ctx, command);
boolean isSyncForwarding = isSync || isNeedReliableReturnValues(command);
Map<Address, Response> addressResponseMap = rpcManager.invokeRemotely(Collections.singletonList(primaryOwner), command,
rpcManager.getDefaultRpcOptions(isSyncForwarding));
if (!isSyncForwarding) return localResult;
try {
return getResponseFromPrimaryOwner(primaryOwner, addressResponseMap);
} catch (RemoteException e) {
Throwable ce = e;
while (ce instanceof RemoteException) {
ce = ce.getCause();
}
if (ce instanceof OutdatedTopologyException) {
// TODO Set another flag that will make the new primary owner only ignore the final value of the command
// If the primary owner throws an OutdatedTopologyException, it must be because the command succeeded there
command.setIgnorePreviousValue(true);
}
throw e;
}
}
}
}
private Object getResponseFromPrimaryOwner(Address primaryOwner, Map<Address, Response> addressResponseMap) {
Response fromPrimaryOwner = addressResponseMap.get(primaryOwner);
if (fromPrimaryOwner == null) {
log.tracef("Primary owner %s returned null", primaryOwner);
return null;
}
if (fromPrimaryOwner.isSuccessful()) {
return ((SuccessfulResponse) fromPrimaryOwner).getResponseValue();
}
if (addressResponseMap.get(primaryOwner) instanceof CacheNotFoundResponse) {
// This means the cache wasn't running on the primary owner, so the command wasn't executed.
// We throw an OutdatedTopologyException, StateTransferInterceptor will catch the exception and
// it will then retry the command.
throw new OutdatedTopologyException("Cache is no longer running on primary owner " + primaryOwner);
}
Throwable cause = fromPrimaryOwner instanceof ExceptionResponse ? ((ExceptionResponse)fromPrimaryOwner).getException() : null;
throw new CacheException("Got unsuccessful response from primary owner: " + fromPrimaryOwner, cause);
}
protected abstract void remoteGetBeforeWrite(InvocationContext ctx, WriteCommand command, RecipientGenerator keygen) throws Throwable;
interface RecipientGenerator {
Collection<Object> getKeys();
List<Address> generateRecipients();
}
class SingleKeyRecipientGenerator implements RecipientGenerator {
private final Object key;
private final Set<Object> keys;
private List<Address> recipients = null;
SingleKeyRecipientGenerator(Object key) {
this.key = key;
keys = Collections.singleton(key);
}
@Override
public List<Address> generateRecipients() {
if (recipients == null) {
recipients = cdl.getOwners(key);
}
return recipients;
}
@Override
public Collection<Object> getKeys() {
return keys;
}
}
class MultipleKeysRecipientGenerator implements RecipientGenerator {
private final Collection<Object> keys;
private List<Address> recipients = null;
MultipleKeysRecipientGenerator(Collection<Object> keys) {
this.keys = keys;
}
@Override
public List<Address> generateRecipients() {
if (recipients == null) {
recipients = cdl.getOwners(keys);
}
return recipients;
}
@Override
public Collection<Object> getKeys() {
return keys;
}
}
}