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J2V8 is a set of Java bindings for V8
/*******************************************************************************
* Copyright (c) 2015 EclipseSource and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* EclipseSource - initial API and implementation
******************************************************************************/
package com.eclipsesource.v8;
/**
* Represents a lock for a V8Runtime that can be moved between
* threads. When instantiated, the lock is automatically assigned
* to the current thread. If another thread wishes to acquire the
* lock, it must first be released.
*/
public class V8Locker {
private Thread thread = null;
V8Locker() {
acquire();
}
/**
* Acquire the lock if it's currently not acquired by another
* thread. If it's current held by another thread, an
* Error will be thrown.
*/
public synchronized void acquire() {
if ((thread != null) && (thread != Thread.currentThread())) {
throw new Error("Invalid V8 thread access.");
}
thread = Thread.currentThread();
}
/**
* Release the lock if it's currently held by the calling thread.
* If the current thread does not hold the lock, and error will be
* thrown.
*/
public synchronized void release() {
checkThread();
thread = null;
}
/**
* Checks if the locker has access to the current thread.
* If the locker holds a different thread, than an Error
* is thrown.
*/
public void checkThread() {
if ((thread != Thread.currentThread())) {
throw new Error("Invalid V8 thread access.");
}
}
/**
* Check if the current thread holds this lock.
*
* @return Returns true if the current thread holds the lock,
* false otherwise.
*/
public boolean hasLock() {
return thread == Thread.currentThread();
}
}