2362N/A * Copyright (c) 1999, 2004, Oracle and/or its affiliates. All rights reserved. 0N/A * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 0N/A * This code is free software; you can redistribute it and/or modify it 0N/A * under the terms of the GNU General Public License version 2 only, as 2362N/A * published by the Free Software Foundation. Oracle designates this 0N/A * particular file as subject to the "Classpath" exception as provided 2362N/A * by Oracle in the LICENSE file that accompanied this code. 0N/A * This code is distributed in the hope that it will be useful, but WITHOUT 0N/A * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 0N/A * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 0N/A * version 2 for more details (a copy is included in the LICENSE file that 0N/A * accompanied this code). 0N/A * You should have received a copy of the GNU General Public License version 0N/A * 2 along with this work; if not, write to the Free Software Foundation, 0N/A * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 2362N/A * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 2362N/A * or visit www.oracle.com if you need additional information or have any 0N/A * A task that can be scheduled for one-time or repeated execution by a Timer. 0N/A * @author Josh Bloch 0N/A * This object is used to control access to the TimerTask internals. 0N/A * The state of this task, chosen from the constants below. 0N/A * This task has not yet been scheduled. 0N/A * This task is scheduled for execution. If it is a non-repeating task, 0N/A * it has not yet been executed. 0N/A * This non-repeating task has already executed (or is currently 0N/A * executing) and has not been cancelled. 0N/A * This task has been cancelled (with a call to TimerTask.cancel). 0N/A * Next execution time for this task in the format returned by 0N/A * System.currentTimeMillis, assuming this task is scheduled for execution. 0N/A * For repeating tasks, this field is updated prior to each task execution. 0N/A * Period in milliseconds for repeating tasks. A positive value indicates 0N/A * fixed-rate execution. A negative value indicates fixed-delay execution. 0N/A * A value of 0 indicates a non-repeating task. 0N/A * Creates a new timer task. 0N/A * The action to be performed by this timer task. 0N/A * Cancels this timer task. If the task has been scheduled for one-time 0N/A * execution and has not yet run, or has not yet been scheduled, it will 0N/A * never run. If the task has been scheduled for repeated execution, it 0N/A * will never run again. (If the task is running when this call occurs, 0N/A * the task will run to completion, but will never run again.) 0N/A * <p>Note that calling this method from within the <tt>run</tt> method of 0N/A * a repeating timer task absolutely guarantees that the timer task will 0N/A * <p>This method may be called repeatedly; the second and subsequent 0N/A * calls have no effect. 0N/A * @return true if this task is scheduled for one-time execution and has 0N/A * not yet run, or this task is scheduled for repeated execution. 0N/A * Returns false if the task was scheduled for one-time execution 0N/A * and has already run, or if the task was never scheduled, or if 0N/A * the task was already cancelled. (Loosely speaking, this method 0N/A * returns <tt>true</tt> if it prevents one or more scheduled 0N/A * executions from taking place.) 0N/A * Returns the <i>scheduled</i> execution time of the most recent 0N/A * <i>actual</i> execution of this task. (If this method is invoked 0N/A * while task execution is in progress, the return value is the scheduled 0N/A * execution time of the ongoing task execution.) 0N/A * <p>This method is typically invoked from within a task's run method, to 0N/A * determine whether the current execution of the task is sufficiently 0N/A * timely to warrant performing the scheduled activity: 0N/A * public void run() { 0N/A * if (System.currentTimeMillis() - scheduledExecutionTime() >= 0N/A * return; // Too late; skip this execution. 0N/A * // Perform the task 0N/A * This method is typically <i>not</i> used in conjunction with 0N/A * <i>fixed-delay execution</i> repeating tasks, as their scheduled 0N/A * execution times are allowed to drift over time, and so are not terribly 0N/A * @return the time at which the most recent execution of this task was 0N/A * scheduled to occur, in the format returned by Date.getTime(). 0N/A * The return value is undefined if the task has yet to commence 0N/A * its first execution. 0N/A * @see Date#getTime()