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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., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA.
*/
package org.gnunet.requests;
import org.gnunet.mq.Envelope;
import org.gnunet.mq.MessageQueue;
import org.gnunet.mq.NotifySentHandler;
import org.gnunet.util.Cancelable;
import org.gnunet.util.RelativeTime;
import org.gnunet.util.Scheduler;
abstract class SimpleRequestIdentifier<T extends Request> implements RequestIdentifier<T> {
private final T request;
/**
* Has the message been queued for sending?
*/
boolean queued;
/**
* Cancel sending the message via the message queue.
*/
private Cancelable sendCancel;
/**
* Has the request been irrevocably sent?
*/
private boolean sent;
private boolean canceled;
private Scheduler.TaskIdentifier timeoutTask;
public SimpleRequestIdentifier(T request) {
this.request = request;
}
@Override
public void retire() {
if (null != timeoutTask) {
timeoutTask.cancel();
timeoutTask = null;
}
}
@Override
public void setTimeout(final RelativeTime timeout, final TimeoutHandler timeoutHandler) {
if (null != timeoutTask)
throw new AssertionError("timeout already set");
timeoutTask = Scheduler.addDelayed(timeout, new Scheduler.Task() {
@Override
public void run(Scheduler.RunContext ctx) {
if (ctx.reasons.contains(Scheduler.Reason.SHUTDOWN))
return;
timeoutHandler.onTimeout();
}
});
}
@Override
public T getRequest() {
return request;
}
@Override
public void cancel() {
if (canceled) {
throw new AssertionError("canceled twice");
}
canceled = true;
if (sent) {
request.cancel();
} else if (null != sendCancel) {
sendCancel.cancel();
sendCancel = null;
}
retire();
}
public void send(MessageQueue mq) {
queued = true;
Envelope ev = request.assembleRequest();
ev.notifySent(new NotifySentHandler() {
@Override
public void onSent() {
sendCancel = null;
sent = true;
}
});
mq.send(ev);
sendCancel = ev;
}
}
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