/*
* Copyright 2009-2012 Roger Kapsi
*
* 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 org.ardverk.dht.io;
import java.io.IOException;
import java.util.concurrent.TimeUnit;
import javax.inject.Provider;
import org.ardverk.collection.CollectionUtils;
import org.ardverk.collection.FixedSizeArrayList;
import org.ardverk.dht.KUID;
import org.ardverk.dht.config.ValueConfig;
import org.ardverk.dht.entity.ValueEntity;
import org.ardverk.dht.message.MessageFactory;
import org.ardverk.dht.message.MessageType;
import org.ardverk.dht.message.NodeResponse;
import org.ardverk.dht.message.ResponseMessage;
import org.ardverk.dht.message.ValueRequest;
import org.ardverk.dht.message.ValueResponse;
import org.ardverk.dht.routing.Contact;
import org.ardverk.dht.routing.RouteTable;
import org.ardverk.dht.rsrc.Key;
/**
* The {@link ValueResponseHandler} manages a {@link MessageType#FIND_VALUE}
* lookup process.
*/
public class ValueResponseHandler extends LookupResponseHandler<ValueEntity> {
private final FixedSizeArrayList<ValueResponse> responses;
private final Key key;
public ValueResponseHandler(Provider<MessageDispatcher> messageDispatcher,
Contact[] contacts, RouteTable routeTable,
Key key, ValueConfig config) {
super(messageDispatcher, contacts, routeTable,
key.getId(), config);
responses = new FixedSizeArrayList<ValueResponse>(config.getR());
this.key = key;
}
@Override
protected synchronized void processResponse0(RequestEntity request,
ResponseMessage response, long time, TimeUnit unit)
throws IOException {
if (response instanceof NodeResponse) {
processNodeResponse((NodeResponse)response, time, unit);
} else {
processValueResponse((ValueResponse)response, time, unit);
}
}
private synchronized void processNodeResponse(NodeResponse response,
long time, TimeUnit unit) throws IOException {
Contact src = response.getContact();
Contact[] contacts = response.getContacts();
processContacts(src, contacts, time, unit);
}
private synchronized void processValueResponse(ValueResponse response,
long time, TimeUnit unit) throws IOException {
responses.add(response);
if (responses.isFull()) {
Outcome outcome = createOutcome();
ValueResponse[] values = CollectionUtils.toArray(responses, ValueResponse.class);
setValue(new ValueEntity(outcome, values));
}
}
@Override
protected void lookup(Contact dst, KUID lookupId,
long timeout, TimeUnit unit) throws IOException {
assert (lookupId.equals(key.getId()));
MessageFactory factory = getMessageFactory();
ValueRequest message = factory.createValueRequest(dst, key);
send(dst, message, timeout, unit);
}
@Override
protected void complete(Outcome outcome) {
if (responses.isEmpty()) {
setException(new NoSuchValueException(outcome));
} else {
ValueResponse[] values = CollectionUtils.toArray(responses, ValueResponse.class);
setValue(new ValueEntity(outcome, values));
}
}
}