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Kafka on Pulsar implemented using Pulsar Protocol Handler

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/**
 * 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 io.streamnative.pulsar.handlers.kop.utils.timer;

import io.streamnative.pulsar.handlers.kop.utils.timer.TimerTaskList.TimerTaskEntry;

/**
 * Timer task.
 */
public abstract class TimerTask implements Runnable {

    protected final long delayMs;
    private volatile TimerTaskEntry timerTaskEntry = null;

    protected TimerTask(long delayMs) {
        this.delayMs = delayMs;
    }

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

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

    }

    TimerTaskEntry getTimerTaskEntry() {
        return timerTaskEntry;
    }

}