/*
 * 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.axis2.transport.http.server;

import org.apache.axiom.util.UIDGenerator;
import org.apache.axis2.context.ServiceContext;
import org.apache.axis2.context.ServiceGroupContext;
import org.apache.axis2.context.SessionContext;
import org.apache.axis2.engine.DependencyManager;

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

public class SessionManager {

    private final Map<String, SessionContext> sessionmap;

    public SessionManager() {
        super();
        this.sessionmap = new HashMap<String, SessionContext>();
    }

    public synchronized SessionContext getSessionContext(String sessionKey) {
        SessionContext sessionContext = null;
        if (sessionKey != null && sessionKey.length() != 0) {
            sessionContext = (SessionContext) this.sessionmap.get(sessionKey);
        }
        if (sessionContext == null) {
            sessionKey = UIDGenerator.generateUID();
            sessionContext = new SessionContext(null);
            sessionContext.setCookieID(sessionKey);
            this.sessionmap.put(sessionKey, sessionContext);
        }
        sessionContext.touch();
        cleanupServiceGroupContexts();
        return sessionContext;
    }

    private void cleanupServiceGroupContexts() {
        long currentTime = System.currentTimeMillis();
        for (Iterator<String> it = this.sessionmap.keySet().iterator(); it.hasNext();) {
            String cookieID = (String) it.next();
            SessionContext sessionContext = (SessionContext) this.sessionmap.get(cookieID);
            if ((currentTime - sessionContext.getLastTouchedTime()) >
                    sessionContext.sessionContextTimeoutInterval) {
                it.remove();
                Iterator<ServiceGroupContext> serviceGroupContext = sessionContext.getServiceGroupContext();
                if (serviceGroupContext != null) {
                    while (serviceGroupContext.hasNext()) {
                        ServiceGroupContext groupContext =
                                (ServiceGroupContext) serviceGroupContext.next();
                        cleanupServiceContexts(groupContext);
                    }
                }
            }
        }
    }

    private void cleanupServiceContexts(final ServiceGroupContext serviceGroupContext) {
        for (Iterator<ServiceContext> it = serviceGroupContext.getServiceContexts(); it.hasNext();) {
            ServiceContext serviceContext = (ServiceContext) it.next();
            DependencyManager.destroyServiceObject(serviceContext);
        }
    }

}
