org.joyqueue.toolkit.delay.TimerTask Maven / Gradle / Ivy

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/**
 * Copyright 2019 The JoyQueue Authors.
 *
 * 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 org.joyqueue.toolkit.delay;

public abstract class TimerTask implements Runnable {
    protected long delayMs;  // timestamp in millisecond

    protected TimerTaskList.TimerTaskEntry timerTaskEntry = null;

    public synchronized void cancel() {
        if (timerTaskEntry != null) {
            timerTaskEntry.remove();
        }
        timerTaskEntry = null;
    }

    protected synchronized void setTimerTaskEntry(TimerTaskList.TimerTaskEntry entry) {
        // if this timerTask is already held by an existing timer task entry,
        // we will remove such an entry first.
        if (timerTaskEntry != null && !timerTaskEntry.equals(entry)) {
            timerTaskEntry.remove();
        }
        timerTaskEntry = entry;
    }

    protected TimerTaskList.TimerTaskEntry getTimerTaskEntry() {
        return timerTaskEntry;
    }
}