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Redis Java client with features of In-Memory Data Grid

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/**
 * Copyright (c) 2013-2024 Nikita Koksharov
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.redisson;

import java.util.concurrent.CompletableFuture;
import java.util.concurrent.ConcurrentLinkedQueue;
import java.util.concurrent.Semaphore;

/**
 *
 * @author Nikita Koksharov
 *
 */
public class RedissonLockEntry implements PubSubEntry {

    private volatile int counter;

    private final Semaphore latch;
    private final CompletableFuture promise;
    private final ConcurrentLinkedQueue listeners = new ConcurrentLinkedQueue();

    public RedissonLockEntry(CompletableFuture promise) {
        super();
        this.latch = new Semaphore(0);
        this.promise = promise;
    }

    public int acquired() {
        return counter;
    }

    public void acquire() {
        counter++;
    }

    public int release() {
        return --counter;
    }

    public CompletableFuture getPromise() {
        return promise;
    }

    public void addListener(Runnable listener) {
        listeners.add(listener);

        if (latch.tryAcquire()) {
            tryRunListener();
        }
    }

    public void tryRunListener() {
        Runnable runnableToExecute = listeners.poll();
        if (runnableToExecute != null) {
            runnableToExecute.run();
        }
    }

    public void tryRunAllListeners() {
        while (true) {
            Runnable runnableToExecute = listeners.poll();
            if (runnableToExecute == null) {
                break;
            }
            runnableToExecute.run();
        }
    }

    public boolean removeListener(Runnable listener) {
        return listeners.remove(listener);
    }

    public Semaphore getLatch() {
        return latch;
    }

    @Override
    public String toString() {
        return "RedissonLockEntry{" +
                "counter=" + counter +
                '}';
    }
}