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/*-
* ============LICENSE_START=======================================================
* Copyright (C) 2018 Ericsson. All rights reserved.
* Modifications Copyright (C) 2020 Nordix Foundation.
* Modifications Copyright (C) 2021 AT&T Intellectual Property. 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.
*
* SPDX-License-Identifier: Apache-2.0
* ============LICENSE_END=========================================================
*/
package org.onap.policy.apex.testsuites.performance.benchmark.eventgenerator;
import java.io.IOException;
import java.net.URI;
import java.nio.file.InvalidPathException;
import java.util.Arrays;
import org.apache.commons.cli.ParseException;
import org.glassfish.grizzly.http.server.HttpServer;
import org.glassfish.jersey.grizzly2.httpserver.GrizzlyHttpServerFactory;
import org.glassfish.jersey.server.ResourceConfig;
import org.onap.policy.apex.core.infrastructure.threading.ThreadUtilities;
import org.onap.policy.common.utils.resources.TextFileUtils;
import org.slf4j.ext.XLogger;
import org.slf4j.ext.XLoggerFactory;
/**
* This class is the main class of a REST server that generates sample events.
*/
public class EventGenerator {
// Get a reference to the logger
private static final XLogger LOGGER = XLoggerFactory.getXLogger(EventGenerator.class);
// Parameters for event generation
private final EventGeneratorParameters parameters;
// The HTTP server we are running
private final HttpServer eventGeneratorServer;
/**
* Instantiates a new event generator with the given parameters.
*
* @param parameters the parameters for the event generator
*/
public EventGenerator(final EventGeneratorParameters parameters) {
this.parameters = parameters;
// Set the parameters in the event generator endpoint
EventGeneratorEndpoint.clearEventGenerationStats();
EventGeneratorEndpoint.setParameters(parameters);
// Add a shutdown hook to shut down the rest services when the process is exiting
Runtime.getRuntime().addShutdownHook(new Thread(new EventGeneratorShutdownHook()));
LOGGER.info("Event generator REST server starting");
final var rc = new ResourceConfig(EventGeneratorEndpoint.class);
eventGeneratorServer = GrizzlyHttpServerFactory.createHttpServer(getBaseUri(), rc);
// Wait for the HTTP server to come up
while (!eventGeneratorServer.isStarted()) {
ThreadUtilities.sleep(50);
}
LOGGER.info("Event generator REST server started");
}
/**
* Get the current event generation statistics.
*
* @return the statistics as a JSON string
*/
public String getEventGenerationStats() {
return EventGeneratorEndpoint.getEventGenerationStats();
}
/**
* Check if event generation is finished.
*
* @return true if event generation is finished
*/
public boolean isFinished() {
return EventGeneratorEndpoint.isFinished();
}
/**
* Tear down the event generator.
*/
public void tearDown() {
LOGGER.info("Event generator shutting down");
eventGeneratorServer.shutdown();
if (parameters.getOutFile() != null) {
try {
TextFileUtils.putStringAsTextFile(getEventGenerationStats(), parameters.getOutFile());
} catch (IOException | InvalidPathException ioe) {
LOGGER.warn("could not output statistics to file \"" + parameters.getOutFile() + "\"", ioe);
}
}
LOGGER.info("Event generator shut down");
}
/**
* Get the base URI for the server.
*
* @return the base URI
*/
private URI getBaseUri() {
String baseUri = "http://" + parameters.getHost() + ':' + parameters.getPort() + '/' + "/EventGenerator";
return URI.create(baseUri);
}
/**
* This class is a shutdown hook for the Apex editor command.
*/
private class EventGeneratorShutdownHook implements Runnable {
/**
* {@inheritDoc}.
*/
@Override
public void run() {
tearDown();
}
}
/**
* The main method.
*
* @param args the arguments
* @throws Exception the exception
*/
public static void main(final String[] args) {
if (LOGGER.isInfoEnabled()) {
LOGGER.info("Starting event generator with arguments: {}", Arrays.toString(args));
}
var parameterHandler = new EventGeneratorParameterHandler();
EventGeneratorParameters parameters = null;
try {
parameters = parameterHandler.parse(args);
} catch (ParseException pe) {
LOGGER.trace("Event generator start exception", pe);
LOGGER.info("Start of event generator failed: {}", pe.getMessage());
return;
}
// Null parameters means we print help
if (parameters == null) {
LOGGER.info(parameterHandler.getHelp(EventGenerator.class.getName()));
return;
}
// Start the event generator
var eventGenerator = new EventGenerator(parameters);
LOGGER.info("Event generator started");
// Wait for event generation to finish
while (!eventGenerator.isFinished()) {
ThreadUtilities.sleep(200);
}
// Shut down the server
eventGenerator.tearDown();
LOGGER.info("Event generator statistics\n" + eventGenerator.getEventGenerationStats());
LOGGER.info("Event generator finished");
}
}
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