/*
* Copyright (c) 2015, WSO2 Inc. (http://www.wso2.org) All Rights Reserved.
*
* 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.wso2.siddhi.sample;
import org.wso2.siddhi.core.ExecutionPlanRuntime;
import org.wso2.siddhi.core.SiddhiManager;
import org.wso2.siddhi.core.event.Event;
import org.wso2.siddhi.core.query.output.callback.QueryCallback;
import org.wso2.siddhi.core.stream.input.InputHandler;
import org.wso2.siddhi.core.util.EventPrinter;
public class FunctionSample {
public static void main(String[] args) throws InterruptedException {
// Creating Siddhi Manager
SiddhiManager siddhiManager = new SiddhiManager();
String executionPlan = "" +
"define stream cseEventStream (symbol string, price1 float, price2 float, volume long , quantity int);" +
"" +
"@info(name = 'query1') " +
"from cseEventStream " +
"select symbol, coalesce(price1,price2) as price, quantity " +
"insert into outputStream;";
//Generating runtime
ExecutionPlanRuntime executionPlanRuntime = siddhiManager.createExecutionPlanRuntime(executionPlan);
//Adding callback to retrieve output events from query
executionPlanRuntime.addCallback("query1", new QueryCallback() {
@Override
public void receive(long timeStamp, Event[] inEvents, Event[] removeEvents) {
EventPrinter.print(timeStamp, inEvents, removeEvents);
}
});
//Retrieving InputHandler to push events into Siddhi
InputHandler inputHandler = executionPlanRuntime.getInputHandler("cseEventStream");
//Starting event processing
executionPlanRuntime.start();
//Sending events to Siddhi
inputHandler.send(new Object[]{"WSO2", 50f, 60f, 60l, 6});
inputHandler.send(new Object[]{"WSO2", 70f, null, 40l, 10});
inputHandler.send(new Object[]{"WSO2", null, 44f, 200l, 56});
Thread.sleep(100);
//Shutting down the runtime
executionPlanRuntime.shutdown();
//Shutting down Siddhi
siddhiManager.shutdown();
}
}