package org.infinispan.marshall.exts;
import org.infinispan.atomic.DeltaAware;
import org.infinispan.commands.RemoteCommandsFactory;
import org.infinispan.commands.ReplicableCommand;
import org.infinispan.commands.TopologyAffectedCommand;
import org.infinispan.commands.read.DistributedExecuteCommand;
import org.infinispan.commands.read.GetKeyValueCommand;
import org.infinispan.commands.remote.CacheRpcCommand;
import org.infinispan.commands.remote.GetKeysInGroupCommand;
import org.infinispan.commands.write.*;
import org.infinispan.factories.GlobalComponentRegistry;
import org.infinispan.commons.io.UnsignedNumeric;
import org.infinispan.commons.marshall.AbstractExternalizer;
import org.infinispan.commons.util.Util;
import org.infinispan.marshall.core.Ids;
import org.infinispan.topology.CacheTopologyControlCommand;
import java.io.IOException;
import java.io.ObjectInput;
import java.io.ObjectOutput;
import java.util.Collection;
import java.util.Set;
/**
* ReplicableCommandExternalizer.
*
* @author Galder Zamarreño
* @since 4.0
*/
public class ReplicableCommandExternalizer extends AbstractExternalizer<ReplicableCommand> {
private final RemoteCommandsFactory cmdFactory;
private final GlobalComponentRegistry globalComponentRegistry;
public ReplicableCommandExternalizer(RemoteCommandsFactory cmdFactory, GlobalComponentRegistry globalComponentRegistry) {
this.cmdFactory = cmdFactory;
this.globalComponentRegistry = globalComponentRegistry;
}
@Override
public void writeObject(ObjectOutput output, ReplicableCommand command) throws IOException {
writeCommandHeader(output, command);
writeCommandParameters(output, command);
}
protected void writeCommandParameters(ObjectOutput output, ReplicableCommand command) throws IOException {
Object[] args = command.getParameters();
int numArgs = (args == null ? 0 : args.length);
UnsignedNumeric.writeUnsignedInt(output, numArgs);
for (int i = 0; i < numArgs; i++) {
Object arg = args[i];
if (arg instanceof DeltaAware) {
// Only write deltas so that replication can be more efficient
DeltaAware dw = (DeltaAware) arg;
output.writeObject(dw.delta());
} else {
output.writeObject(arg);
}
}
if (command instanceof TopologyAffectedCommand) {
output.writeInt(((TopologyAffectedCommand) command).getTopologyId());
}
}
protected void writeCommandHeader(ObjectOutput output, ReplicableCommand command) throws IOException {
// To decide whether it's a core or user defined command, load them all and check
Collection<Class<? extends ReplicableCommand>> moduleCommands = getModuleCommands();
// Write an indexer to separate commands defined external to the
// infinispan core module from the ones defined via module commands
if (moduleCommands != null && moduleCommands.contains(command.getClass()))
output.writeByte(1);
else
output.writeByte(0);
output.writeShort(command.getCommandId());
}
@Override
public ReplicableCommand readObject(ObjectInput input) throws IOException, ClassNotFoundException {
byte type = input.readByte();
short methodId = input.readShort();
Object[] args = readParameters(input);
ReplicableCommand replicableCommand = cmdFactory.fromStream((byte) methodId, args, type);
if (replicableCommand instanceof TopologyAffectedCommand) {
int topologyId = input.readInt();
((TopologyAffectedCommand) replicableCommand).setTopologyId(topologyId);
}
return replicableCommand;
}
protected Object[] readParameters(ObjectInput input) throws IOException, ClassNotFoundException {
int numArgs = UnsignedNumeric.readUnsignedInt(input);
Object[] args = null;
if (numArgs > 0) {
args = new Object[numArgs];
// For DeltaAware instances, nothing special to be done here.
// Do not merge here since the cache contents are required.
// Instead, merge in PutKeyValueCommand.perform
for (int i = 0; i < numArgs; i++) args[i] = input.readObject();
}
return args;
}
protected CacheRpcCommand fromStream(byte id, Object[] parameters, byte type, String cacheName) {
return cmdFactory.fromStream(id, parameters, type, cacheName);
}
@Override
public Integer getId() {
return Ids.REPLICABLE_COMMAND;
}
@Override
public Set<Class<? extends ReplicableCommand>> getTypeClasses() {
Set<Class<? extends ReplicableCommand>> coreCommands = Util.asSet(
CacheTopologyControlCommand.class, DistributedExecuteCommand.class, GetKeyValueCommand.class,
ClearCommand.class, EvictCommand.class, ApplyDeltaCommand.class,
InvalidateCommand.class, InvalidateL1Command.class,
PutKeyValueCommand.class,
PutMapCommand.class, RemoveCommand.class,
ReplaceCommand.class, GetKeysInGroupCommand.class);
// Search only those commands that replicable and not cache specific replicable commands
Collection<Class<? extends ReplicableCommand>> moduleCommands = globalComponentRegistry.getModuleProperties().moduleOnlyReplicableCommands();
if (moduleCommands != null && !moduleCommands.isEmpty()) coreCommands.addAll(moduleCommands);
return coreCommands;
}
private Collection<Class<? extends ReplicableCommand>> getModuleCommands() {
return globalComponentRegistry.getModuleProperties().moduleCommands();
}
}