Java tutorial
/* * 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.jsecurity.session.mgt; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import java.util.concurrent.Executors; import java.util.concurrent.ScheduledExecutorService; import java.util.concurrent.TimeUnit; /** * SessionValidationScheduler implementation that uses a * {@link ScheduledExecutorService} to call {@link ValidatingSessionManager#validateSessions()} every * <em>{@link #getInterval interval}</em> milliseconds. * * @author Les Hazlewood * @since 0.9 */ public class ExecutorServiceSessionValidationScheduler implements SessionValidationScheduler, Runnable { //TODO - complete JavaDoc /** Private internal log instance. */ private static final Log log = LogFactory.getLog(ExecutorServiceSessionValidationScheduler.class); ValidatingSessionManager sessionManager; private ScheduledExecutorService service; private long interval = DefaultSessionManager.DEFAULT_SESSION_VALIDATION_INTERVAL; private boolean enabled = false; public ExecutorServiceSessionValidationScheduler() { super(); } public ExecutorServiceSessionValidationScheduler(ValidatingSessionManager sessionManager) { this.sessionManager = sessionManager; } public ValidatingSessionManager getSessionManager() { return sessionManager; } public void setSessionManager(ValidatingSessionManager sessionManager) { this.sessionManager = sessionManager; } public long getInterval() { return interval; } public void setInterval(long interval) { this.interval = interval; } public boolean isEnabled() { return this.enabled; } public void enableSessionValidation() { if (this.interval > 0l) { this.service = Executors.newSingleThreadScheduledExecutor(); this.service.scheduleAtFixedRate(this, interval, interval, TimeUnit.MILLISECONDS); this.enabled = true; } } public void run() { if (log.isDebugEnabled()) { log.debug("Executing session validation..."); } long startTime = System.currentTimeMillis(); this.sessionManager.validateSessions(); long stopTime = System.currentTimeMillis(); if (log.isDebugEnabled()) { log.debug("Session validation completed successfully in " + (stopTime - startTime) + " milliseconds."); } } public void disableSessionValidation() { this.service.shutdownNow(); this.enabled = false; } }