trunk/src/modules/notification/java/src/org/apache/lenya/inbox/AbstractInboxManager.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 *  contributor license agreements.  See the NOTICE file distributed with
 *  this work for additional information regarding copyright ownership.
 *  The ASF licenses this file to You 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.apache.lenya.inbox;

import java.util.HashMap;
import java.util.Map;

import org.apache.avalon.framework.logger.AbstractLogEnabled;
import org.apache.avalon.framework.thread.ThreadSafe;
import org.apache.lenya.ac.User;

/**
 * Abstract base class for inbox managers.
 */
public abstract class AbstractInboxManager extends AbstractLogEnabled implements InboxManager,
        ThreadSafe {

    private Map inboxes = new HashMap();

    public synchronized Inbox getInbox(User user) {
        Inbox inbox = (Inbox) this.inboxes.get(user);
        if (inbox == null) {
            inbox = doGetInbox(user);
            this.inboxes.put(user, inbox);
        }
        return inbox;
    }

    protected abstract Inbox doGetInbox(User user);

}