recordstorelock.java

来自「This is a resource based on j2me embedde」· Java 代码 · 共 72 行

/*
 *
 *
 * Copyright  1990-2008 Sun Microsystems, Inc. All Rights Reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER
 * 
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License version
 * 2 only, as published by the Free Software Foundation.
 * 
 * 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
 * General Public License version 2 for more details (a copy is
 * included at /legal/license.txt).
 * 
 * You should have received a copy of the GNU General Public License
 * version 2 along with this work; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA
 * 
 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
 * Clara, CA 95054 or visit www.sun.com if you need additional
 * information or have any questions.
 */

package com.sun.midp.rms;
import com.sun.midp.util.isolate.InterIsolateMutex;
import com.sun.midp.security.SecurityToken;
import com.sun.midp.security.Permissions;

/**
 * AbstractRecordStoreLock interface implementation for
 * MIDP on CLDC.
 */
class RecordStoreLock implements AbstractRecordStoreLock {
    /** Inter-isolate mutex that provides locking */
    private InterIsolateMutex mutex;

    /**
     * Obtains the lock. Blocks if another MIDlet is holding the lock.
     */    
    public void obtain() {
        mutex.lock();
    }

    /**
     * Releases the lock and unblocks waiters.
     */
    public void release() {
        mutex.unlock();
    }

    /**
     * Constructor.
     *
     * @param token security token
     * @name lock name
     */
    RecordStoreLock(SecurityToken token, String name) {
        mutex = InterIsolateMutex.getInstance(token, name);
    }    

    /**
     * Private constructor to prevent creating uninitialized
     * class instances.
     */
    private RecordStoreLock() {
        mutex = null;
    }
}