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The free Java library for Asterisk PBX integration.
There is a newer version: 3.41.0
package org.asteriskjava.lock;

import com.google.common.util.concurrent.RateLimiter;
import org.asteriskjava.lock.Locker.LockCloser;

import java.util.concurrent.atomic.AtomicInteger;
import java.util.concurrent.atomic.AtomicLong;
import java.util.concurrent.atomic.AtomicReference;
import java.util.concurrent.locks.ReentrantLock;

public class Lockable {
    private final ReentrantLock internalLock = new ReentrantLock(false);
    final private String lockName;
    final AtomicReference threadHoldingLock = new AtomicReference<>();
    private final AtomicInteger totalWaitTime = new AtomicInteger();
    private final AtomicInteger totalHoldTime = new AtomicInteger();
    private final AtomicInteger requested = new AtomicInteger();
    private final AtomicInteger waited = new AtomicInteger();
    private final AtomicInteger acquired = new AtomicInteger();
    private volatile boolean dumped = false;
    private volatile boolean blocked = false;

    private final RateLimiter rateLimiter = RateLimiter.create(4);

    private final static AtomicLong seed = new AtomicLong();
    private final long lockableId = seed.incrementAndGet();

    public Lockable() {
        this.lockName = getLockCaller();
    }

    private String getLockCaller() {
        StackTraceElement[] trace = new Exception().getStackTrace();
        String name = this.getClass().getCanonicalName();
        for (StackTraceElement element : trace) {
            if (element.getFileName() != null && !element.getFileName().contains(Lockable.class.getSimpleName())) {
                name = element.getFileName() + " " + element.getMethodName() + " " + element.getLineNumber() + " "
                        + element.getClassName();
                break;
            }
        }

        return name;
    }

    String asLockString() {
        return "Lockable [waited=" + waited + ", waitTime=" + totalWaitTime + ", totalHoldTime=" + totalHoldTime
                + ", acquired=" + acquired + ", object=" + lockName + ", id=" + lockableId + "]";
    }

    long getLockAverageHoldTime() {
        long hold = totalHoldTime.get();
        long count = acquired.get();
        if (count < 10) {
            return 250;
        }
        return Math.max(hold / count, 50);
    }

    public LockCloser withLock() {
        return Locker.doWithLock(this);
    }

    ReentrantLock getInternalLock() {
        return internalLock;
    }

    void addLockTotalWaitTime(int time) {
        totalWaitTime.addAndGet(time);
    }

    void addLockTotalHoldTime(int time) {
        totalHoldTime.addAndGet(time);
    }

    int addLockRequested() {
        return requested.incrementAndGet();
    }

    void addLockWaited(int time) {
        waited.addAndGet(time);
    }

    void addLockAcquired(int count) {
        acquired.addAndGet(count);
    }

    boolean isLockDumped() {
        return dumped;
    }

    void setLockDumped(boolean dumped) {
        this.dumped = dumped;
    }

    int getLockTotalWaitTime() {
        return totalWaitTime.intValue();
    }

    int getLockWaited() {
        return waited.intValue();
    }

    int getLockRequested() {
        return requested.intValue();
    }

    Long getLockableId() {
        return lockableId;
    }

    int getLockTotalHoldTime() {
        return totalHoldTime.intValue();
    }

    int getLockAcquired() {
        return acquired.intValue();
    }

    boolean wasLockBlocked() {
        return blocked;
    }

    void setLockBlocked(boolean blocked) {
        this.blocked = blocked;
    }

    public RateLimiter getDumpRateLimit() {
        return rateLimiter;
    }

}