/**
 *
 * Copyright 2014-2018 Florian Schmaus
 *
 * 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 org.jivesoftware.smack;

import java.util.Collection;
import java.util.Collections;
import java.util.Set;
import java.util.concurrent.CopyOnWriteArraySet;

public class XMPPConnectionRegistry {

    /**
     * A set of listeners which will be invoked if a new connection is created.
     */
    private static final Set<ConnectionCreationListener> connectionEstablishedListeners =
            new CopyOnWriteArraySet<>();

    /**
     * Adds a new listener that will be notified when new Connections are created. Note
     * that newly created connections will not be actually connected to the server.
     *
     * @param connectionCreationListener a listener interested on new connections.
     */
    public static void addConnectionCreationListener(
            ConnectionCreationListener connectionCreationListener) {
        connectionEstablishedListeners.add(connectionCreationListener);
    }

    /**
     * Removes a listener that was interested in connection creation events.
     *
     * @param connectionCreationListener a listener interested on new connections.
     */
    public static void removeConnectionCreationListener(
            ConnectionCreationListener connectionCreationListener) {
        connectionEstablishedListeners.remove(connectionCreationListener);
    }



    /**
     * Get the collection of listeners that are interested in connection creation events.
     *
     * @return a collection of listeners interested on new connections.
     */
    protected static Collection<ConnectionCreationListener> getConnectionCreationListeners() {
        return Collections.unmodifiableCollection(connectionEstablishedListeners);
    }

}
