84 lines
2.8 KiB
Java
84 lines
2.8 KiB
Java
/**
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*
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* Copyright 2016 Florian Schmaus
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.jivesoftware.smack.roster;
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import java.util.Collection;
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import java.util.Date;
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import java.util.concurrent.TimeoutException;
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import java.util.concurrent.locks.Condition;
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import java.util.concurrent.locks.Lock;
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import java.util.concurrent.locks.ReentrantLock;
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import org.jxmpp.jid.BareJid;
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import org.jxmpp.jid.Jid;
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public class RosterUtil {
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public static void waitUntilOtherEntityIsSubscribed(Roster roster, BareJid otherEntity, long timeoutMillis)
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throws InterruptedException, TimeoutException {
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Date deadline = new Date(System.currentTimeMillis() + timeoutMillis);
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waitUntilOtherEntityIsSubscribed(roster, otherEntity, deadline);
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}
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public static void waitUntilOtherEntityIsSubscribed(Roster roster, final BareJid otherEntity, Date deadline)
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throws InterruptedException, TimeoutException {
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final Lock lock = new ReentrantLock();
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final Condition maybeSubscribed = lock.newCondition();
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RosterListener rosterListener = new AbstractRosterListener() {
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private void signal() {
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lock.lock();
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try {
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// No need to use signalAll() here.
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maybeSubscribed.signal();
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}
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finally {
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lock.unlock();
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}
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}
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@Override
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public void entriesAdded(Collection<Jid> addresses) {
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signal();
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}
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@Override
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public void entriesUpdated(Collection<Jid> addresses) {
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signal();
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}
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};
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roster.addRosterListener(rosterListener);
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boolean stillWaiting = true;
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// Using the example code pattern from Condition.awaitUntil(Date) javadoc.
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lock.lock();
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try {
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while (!roster.isSubscribedToMyPresence(otherEntity)) {
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if (!stillWaiting) {
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throw new TimeoutException();
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}
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stillWaiting = maybeSubscribed.awaitUntil(deadline);
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}
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}
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finally {
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lock.unlock();
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// Make sure the listener is removed, so we don't leak it.
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roster.removeRosterListener(rosterListener);
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}
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}
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}
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