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/*
This file is part of GNUnet.
Copyright (C) 2014 Christian Grothoff (and other contributing authors)
GNUnet is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published
by the Free Software Foundation; either version 3, or (at your
option) any later version.
GNUnet is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with GNUnet; see the file COPYING. If not, write to the
Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.
*/
package org.gnunet.requests;
import com.google.common.collect.Maps;
import org.gnunet.mq.MessageQueue;
import org.gnunet.util.Cancelable;
import java.util.Map;
/**
* Container for requests that are responded to with a matching getRequestIdentifier identification
*/
public class MatchingRequestContainer<K, T extends Request> extends RequestContainer {
/**
* All queued requests.
*/
private Map<K,Identifier> requests = Maps.newHashMap();
/**
* Message queue to send to requests over.
*/
private final MessageQueue mq;
public MatchingRequestContainer(MessageQueue mq) {
this.mq = mq;
}
private class Identifier extends SimpleRequestIdentifier<T> {
final K key;
public Identifier(T request, K key) {
super(request);
this.key = key;
}
@Override
public void retire() {
super.retire();
requests.remove(key);
}
}
public Cancelable addRequest(K key, final T request) {
if (requests.containsKey(key))
throw new AssertionError("key already present in getRequestIdentifier container");
Identifier identifier = new Identifier(request, key);
requests.put(key, identifier);
identifier.send(mq);
return identifier;
}
@Override
public void restart() {
Map<K, Identifier> requestsOld = requests;
requests = Maps.newHashMap();
for (Map.Entry<K,Identifier> e : requestsOld.entrySet()) {
addRequest(e.getKey(), e.getValue().getRequest());
}
}
public RequestIdentifier<T> getRequestIdentifier(K key) {
return requests.get(key);
}
public T getAndRetireRequest(K key) {
RequestIdentifier<T> i = getRequestIdentifier(key);
if (null == i)
return null;
i.retire();
return i.getRequest();
}
}
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