sun_fc/common/Listener.cc

	Listener.cc revision fcf3ce441efd61da9bb2884968af01cb7c1452cc
/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 *  You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */


#include "Listener.h"
#include "Exceptions.h"
#include "Lockable.h"

using namespace std;

/**
 * Global lock for list of listeners
 */
pthread_mutex_t Listener::staticLock = PTHREAD_MUTEX_INITIALIZER;

/**
 * Global list of listeners
 */
vector<Listener*> Listener::listeners;

/**
 * Type for listener list iteration
 */
typedef vector<Listener *>::iterator ListenerIterator;

/**
 * @memo        Create a new generic listener
 * @exception       ... underlying exceptions will be thrown
 * @param       userData The opaque user data for event callback
 *
 */
Listener::Listener(void *userData) {
    data = userData;
    Lockable::lock(&staticLock);
    try {
        listeners.insert(listeners.begin(), this);
    } catch (...) {
        Lockable::unlock(&staticLock);
        throw;
    }
    Lockable::unlock(&staticLock);
}

/**
 * @memo        Free up a generic listener, keeping global list in sync.
 * @exception       ... underlying exceptions will be thrown
 */
Listener::~Listener() {
    Lockable::lock(&staticLock);
    try {
        for (ListenerIterator tmp = listeners.begin();
            tmp != listeners.end(); tmp++) {
        if (*tmp == this) {
            listeners.erase(tmp);
            Lockable::unlock(&staticLock);
            return;
        }
        }
    } catch (...) {
        Lockable::unlock(&staticLock);
        throw;
    }
    Lockable::unlock(&staticLock);
}

/**
 * @memo        Find a listener based on the callback handle
 * @exception       InvalidHandleException if the callback handle does not
 *          match any listeners
 * @return      The Listener who matches the callback handle
 * @param       cbh The callback handle
 */
Listener* Listener::findListener(void *cbh) {
    Lockable::lock(&staticLock);
    try {
        for (ListenerIterator tmp = listeners.begin();
            tmp != listeners.end(); tmp++) {
        if (*tmp == cbh) {
            Lockable::unlock(&staticLock);
            return (*tmp);
        }
        }
    } catch (...) {
        Lockable::unlock(&staticLock);
        throw;
    }
    Lockable::unlock(&staticLock);
    throw InvalidHandleException();
}