/*
* Copyright (c) 2008-2013, Hazelcast, Inc. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.hazelcast.client;
import com.hazelcast.nio.Address;
import com.hazelcast.spi.Callback;
import com.hazelcast.spi.InvocationBuilder;
import com.hazelcast.spi.Operation;
import com.hazelcast.spi.OperationFactory;
import java.util.Collection;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
import static java.util.Collections.synchronizedSet;
/**
* Base class for client requests that will be send more than one member
*/
public abstract class MultiTargetClientRequest extends ClientRequest {
private static final int TRY_COUNT = 100;
@Override
final void process() throws Exception {
ClientEndpoint endpoint = getEndpoint();
OperationFactory operationFactory = createOperationFactory();
Collection<Address> targets = getTargets();
if (targets.isEmpty()) {
endpoint.sendResponse(reduce(new HashMap<Address, Object>()), getCallId());
return;
}
MultiTargetCallback callback = new MultiTargetCallback(targets);
for (Address target : targets) {
Operation op = operationFactory.createOperation();
op.setCallerUuid(endpoint.getUuid());
InvocationBuilder builder = operationService.createInvocationBuilder(getServiceName(), op, target)
.setTryCount(TRY_COUNT)
.setResultDeserialized(false)
.setCallback(new SingleTargetCallback(target, callback));
builder.invoke();
}
}
protected abstract OperationFactory createOperationFactory();
protected abstract Object reduce(Map<Address, Object> map);
public abstract Collection<Address> getTargets();
private final class MultiTargetCallback {
final Collection<Address> targets;
final ConcurrentMap<Address, Object> results;
private MultiTargetCallback(Collection<Address> targets) {
this.targets = synchronizedSet(new HashSet<Address>(targets));
this.results = new ConcurrentHashMap<Address, Object>(targets.size());
}
public void notify(Address target, Object result) {
if (targets.remove(target)) {
results.put(target, result);
} else {
if (results.containsKey(target)) {
throw new IllegalArgumentException("Duplicate response from -> " + target);
}
throw new IllegalArgumentException("Unknown target! -> " + target);
}
if (targets.isEmpty()) {
Object response = reduce(results);
endpoint.sendResponse(response, getCallId());
}
}
}
private static final class SingleTargetCallback implements Callback<Object> {
final Address target;
final MultiTargetCallback parent;
private SingleTargetCallback(Address target, MultiTargetCallback parent) {
this.target = target;
this.parent = parent;
}
@Override
public void notify(Object object) {
parent.notify(target, object);
}
}
}