001/*
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *   http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing,
013 * software distributed under the License is distributed on an
014 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
015 * KIND, either express or implied.  See the License for the
016 * specific language governing permissions and limitations
017 * under the License.
018 */
019package org.eclipse.aether.named.hazelcast;
020
021import java.util.concurrent.ConcurrentHashMap;
022import java.util.concurrent.ConcurrentMap;
023import java.util.concurrent.TimeUnit;
024
025import com.hazelcast.core.HazelcastInstance;
026import com.hazelcast.cp.ISemaphore;
027import org.eclipse.aether.named.NamedLock;
028import org.eclipse.aether.named.NamedLockKey;
029import org.eclipse.aether.named.support.AdaptedSemaphoreNamedLock;
030import org.eclipse.aether.named.support.AdaptedSemaphoreNamedLock.AdaptedSemaphore;
031import org.eclipse.aether.named.support.NamedLockFactorySupport;
032
033import static java.util.Objects.requireNonNull;
034
035/**
036 * Factory of {@link AdaptedSemaphoreNamedLock} instances, using adapted Hazelcast {@link ISemaphore}. It delegates
037 * most the work to {@link HazelcastSemaphoreProvider} and this class just adapts the returned semaphore to named lock
038 * and caches {@link ISemaphore} instances, as recommended by Hazelcast.
039 *
040 * @deprecated Hazelcast support will be dropped.
041 */
042@Deprecated
043public class HazelcastSemaphoreNamedLockFactory extends NamedLockFactorySupport {
044    protected final HazelcastInstance hazelcastInstance;
045
046    protected final boolean manageHazelcast;
047
048    private final HazelcastSemaphoreProvider hazelcastSemaphoreProvider;
049
050    private final ConcurrentMap<NamedLockKey, ISemaphore> semaphores;
051
052    public HazelcastSemaphoreNamedLockFactory(
053            final HazelcastInstance hazelcastInstance,
054            final boolean manageHazelcast,
055            final HazelcastSemaphoreProvider hazelcastSemaphoreProvider) {
056        this.hazelcastInstance = requireNonNull(hazelcastInstance);
057        this.manageHazelcast = manageHazelcast;
058        this.hazelcastSemaphoreProvider = requireNonNull(hazelcastSemaphoreProvider);
059        this.semaphores = new ConcurrentHashMap<>();
060    }
061
062    @Override
063    protected AdaptedSemaphoreNamedLock createLock(final NamedLockKey key) {
064        ISemaphore semaphore = semaphores.computeIfAbsent(
065                key, k -> hazelcastSemaphoreProvider.acquireSemaphore(hazelcastInstance, key));
066        return new AdaptedSemaphoreNamedLock(key, this, new HazelcastSemaphore(semaphore));
067    }
068
069    @Override
070    protected void destroyLock(final NamedLock namedLock) {
071        if (namedLock instanceof AdaptedSemaphoreNamedLock) {
072            final NamedLockKey key = namedLock.key();
073            hazelcastSemaphoreProvider.releaseSemaphore(hazelcastInstance, key, semaphores.remove(key));
074        }
075    }
076
077    @Override
078    protected void doShutdown() {
079        if (manageHazelcast) {
080            hazelcastInstance.shutdown();
081        }
082    }
083
084    private static final class HazelcastSemaphore implements AdaptedSemaphore {
085        private final ISemaphore semaphore;
086
087        private HazelcastSemaphore(final ISemaphore semaphore) {
088            this.semaphore = semaphore;
089        }
090
091        @Override
092        public boolean tryAcquire(final int perms, final long time, final TimeUnit unit) throws InterruptedException {
093            return semaphore.tryAcquire(perms, time, unit);
094        }
095
096        @Override
097        public void release(final int perms) {
098            semaphore.release(perms);
099        }
100    }
101}