/*
* 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.apache.zeppelin.example.app.clock;
import org.apache.zeppelin.helium.Application;
import org.apache.zeppelin.helium.ApplicationContext;
import org.apache.zeppelin.helium.ApplicationException;
import org.apache.zeppelin.helium.ZeppelinApplicationDevServer;
import org.apache.zeppelin.resource.*;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Date;
/**
* Basic example application.
* Get java.util.Date from resource pool and display it
*/
public class Clock extends Application {
private final Logger logger = LoggerFactory.getLogger(Clock.class);
Date date;
boolean shutdown = false;
private Thread updateThread;
public Clock(ApplicationContext context) {
super(context);
}
@Override
public void run(ResourceSet resources) throws ApplicationException {
// Get data from resource args
date = (Date) resources.get(0).get();
// print view template
try {
context().out.writeResource("example/app/clock/clock.html");
} catch (IOException e) {
throw new ApplicationException(e);
}
if (updateThread == null) {
start();
}
}
public void start() {
updateThread = new Thread() {
public void run() {
while (!shutdown) {
// format date
SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
// put formatted string to angular object.
context().getAngularObjectRegistry().add("date", df.format(date));
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
// nothing todo
}
date = new Date(date.getTime() + 1000);
}
}
};
updateThread.start();
}
@Override
public void unload() throws ApplicationException {
shutdown = true;
try {
updateThread.join();
} catch (InterruptedException e) {
// nothing to do
}
context().getAngularObjectRegistry().remove("date");
}
/**
* Development mode
*/
public static void main(String[] args) throws Exception {
LocalResourcePool pool = new LocalResourcePool("dev");
pool.put("date", new Date());
ZeppelinApplicationDevServer devServer = new ZeppelinApplicationDevServer(
Clock.class.getName(),
pool.getAll());
devServer.start();
devServer.join();
}
}