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/*
 * Copyright (C) 2006-2010 Schlichtherle IT Services
 *
 * 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 de.schlichtherle.io;

/**
 * Similar to {@code java.util.concurrent.locks.Lock},
 * but simplified and adapted to the particular needs of TrueZIP.
 * The subset of methods common to both this interface and its cousin
 * in JSE 1.5 is identical in functionality.
 * However, some other methods have been added here in order to suit
 * the particular needs of TrueZIP (see {@link ArchiveController}).
 * 
 * @author Christian Schlichtherle
 * @version $Id: ReentrantLock.java,v 1.4 2010/08/20 13:09:42 christian_schlichtherle Exp $
 * @since TrueZIP 6.2
 */
interface ReentrantLock {

    /**
     * Returns {@code true} if and only if the current thread has
     * acquired this lock.
     */
    boolean isLocked();

    /**
     * Returns the number of times the current thread has successfully
     * acquired this lock.
     */
    int lockCount();

    /**
     * Acquires this lock by the current thread, eventually blocking.
     */
    void lock();

    /**
     * Acquires this lock by the current thread unless it is interrupted,
     * eventually blocking.
     */
    void lockInterruptibly() throws InterruptedException;

    /**
     * Acquires this lock if and only if it is available at the time of
     * invocation by the current thread and returns {@code true}.
     * Otherwise, If this lock is not available then {@code false}
     * is returned.
     */
    boolean tryLock();

    /**
     * Releases this lock.
     *
     * @throws IllegalMonitorStateException If the current thread has not
     *         acquired this lock.
     */
    void unlock() throws IllegalMonitorStateException;
}