scouter.util.BackJob Maven / Gradle / Ivy
/*
* Copyright 2015 the original author or authors.
* @https://github.com/scouter-project/scouter
*
* 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 scouter.util;
public class BackJob extends Thread {
private static BackJob instance = null;
public final static synchronized BackJob getInstance() {
if (instance == null) {
instance = new BackJob();
instance.setDaemon(true);
instance.setName(ThreadUtil.getName(instance));
instance.start();
}
return instance;
}
private static class Job {
long interval;
long nextExecTime;
Runnable run;
public Job(long interval, Runnable run) {
this.interval = interval;
this.run = run;
}
}
private StringKeyLinkedMap< Job> jobTable = new StringKeyLinkedMap().setMax(1000);
public void add(String name, long tm, Runnable r) {
jobTable.put(name, new Job(tm, r));
}
public void remove(String name) {
jobTable.remove(name);
}
public void run() {
while (true) {
ThreadUtil.sleep(1000);
long now = System.currentTimeMillis();
StringEnumer en = jobTable.keys();
while (en.hasMoreElements()) {
String name = en.nextString();
try {
Job job = jobTable.get(name);
if (now >= job.nextExecTime) {
job.nextExecTime = job.interval + System.currentTimeMillis();
}
job.run.run();
} catch (Throwable e) {
e.printStackTrace();
}
}
}
}
}