IOSessionRegistry.java

/*
 * 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 com.ok2c.lightmtp.impl.agent;

import java.util.HashSet;
import java.util.Iterator;
import java.util.Set;

import org.apache.http.nio.reactor.IOSession;

class IOSessionRegistry {

    private final Set<IOSession> sessions;
    private final IOSessionRegistryCallback callback;

    public IOSessionRegistry(final IOSessionRegistryCallback callback) {
        super();
        this.callback = callback;
        this.sessions = new HashSet<IOSession>();
    }

    public synchronized void add(final IOSession iosession) {
        if (iosession == null) {
            return;
        }
        this.sessions.add(iosession);
        if (this.callback != null) {
            this.callback.added(iosession);
        }
        notifyAll();
    }

    public synchronized void remove(final IOSession iosession) {
        if (iosession == null) {
            return;
        }
        this.sessions.remove(iosession);
        if (this.callback != null) {
            this.callback.removed(iosession);
        }
        notifyAll();
    }

    public synchronized boolean isEmpty() {
        return this.sessions.isEmpty();
    }

    public Iterator<IOSession> iterator() {
        return this.sessions.iterator();
    }

    @Override
    public synchronized String toString() {
        return this.sessions.toString();
    }

}