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/*
* SonarQube
* Copyright (C) 2009-2025 SonarSource SA
* mailto:info AT sonarsource DOT com
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 3 of the License, or (at your option) any later version.
*
* This program 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
package org.sonar.process.cluster.hz;
import com.hazelcast.map.IMap;
import java.util.UUID;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.Lock;
public class DistributedLock implements Lock {
private final IMap<String, UUID> lockMap;
private final String lockName;
private final UUID ownerId;
public DistributedLock(IMap<String, UUID> lockMap, String lockName) {
this.lockMap = lockMap;
this.lockName = lockName;
// Unique ID for this lock owner
this.ownerId = UUID.randomUUID();
}
@Override
public void lock() {
while (!tryLock()) {
try {
// Retry after a short delay
Thread.sleep(10);
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
throw new IllegalStateException("Thread interrupted while acquiring lock");
}
}
}
@Override
public void unlock() {
lockMap.computeIfPresent(lockName, (key, value) -> value.equals(ownerId) ? null : value);
}
@Override
public boolean tryLock() {
return lockMap.putIfAbsent(lockName, ownerId) == null;
}
@Override
public boolean tryLock(long time, TimeUnit unit) throws InterruptedException {
long deadline = System.currentTimeMillis() + unit.toMillis(time);
while (System.currentTimeMillis() < deadline) {
if (tryLock()) {
return true;
}
// Retry after a short delay
Thread.sleep(10);
}
return false;
}
@Override
public Condition newCondition() {
throw new UnsupportedOperationException("Conditions are not supported in DistributedLock");
}
@Override
public void lockInterruptibly() throws InterruptedException {
throw new UnsupportedOperationException("Interruptible locking is not supported in DistributedLock");
}
}
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