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/*-
* ============LICENSE_START=======================================================
* Copyright (C) 2016-2018 Ericsson. 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.client.monitoring.rest;
import java.io.PrintStream;
import org.slf4j.ext.XLogger;
import org.slf4j.ext.XLoggerFactory;
/**
* The main class for Apex Restful Monitoring.
*
* @author Michael Watkins (michael.watkins@ericsson.com)
*/
public class ApexMonitoringRestMain {
// Logger for this class
private static final XLogger LOGGER = XLoggerFactory.getXLogger(ApexMonitoringRestMain.class);
// Recurring string constants
private static final String REST_ENDPOINT_PREFIX = "Apex Services REST endpoint (";
// Services state
public enum ServicesState {
STOPPED, READY, INITIALIZING, RUNNING
}
private ServicesState state = ServicesState.STOPPED;
// The parameters for the client
private ApexMonitoringRestParameters parameters = null;
// Output and error streams for messages
private final PrintStream outStream;
// The Apex services client this class is running
private ApexMonitoringRest apexMonitoringRest = null;
/**
* Main method, main entry point for command.
*
* @param args The command line arguments for the client
*/
public static void main(final String[] args) {
try {
final ApexMonitoringRestMain restMain = new ApexMonitoringRestMain(args, System.out);
restMain.init();
} catch (final Exception e) {
LOGGER.error("start failed", e);
}
}
/**
* Constructor, kicks off the rest service.
*
* @param args The command line arguments for the RESTful service
* @param outStream The stream for output messages
*/
public ApexMonitoringRestMain(final String[] args, final PrintStream outStream) {
// Save the streams for output and error
this.outStream = outStream;
// Client parameter parsing
final ApexMonitoringRestParameterParser parser = new ApexMonitoringRestParameterParser();
try {
// Get and check the parameters
parameters = parser.parse(args);
} catch (final ApexMonitoringRestParameterException e) {
throw new ApexMonitoringRestParameterException(
REST_ENDPOINT_PREFIX + this.toString() + ") parameter error, " + e.getMessage() + '\n'
+ parser.getHelp(ApexMonitoringRestMain.class.getCanonicalName()));
}
if (parameters.isHelpSet()) {
throw new ApexMonitoringRestParameterException(
parser.getHelp(ApexMonitoringRestMain.class.getCanonicalName()));
}
// Validate the parameters
final String validationMessage = parameters.validate();
if (validationMessage.length() > 0) {
throw new ApexMonitoringRestParameterException(
REST_ENDPOINT_PREFIX + this.toString() + ") parameters invalid, " + validationMessage
+ '\n' + parser.getHelp(ApexMonitoringRestMain.class.getCanonicalName()));
}
state = ServicesState.READY;
}
/**
* Initialize the rest service.
*/
public void init() {
outStream.println(REST_ENDPOINT_PREFIX + this.toString() + ") starting at "
+ parameters.getBaseUri().toString() + " . . .");
try {
state = ServicesState.INITIALIZING;
// Start the REST service
apexMonitoringRest = new ApexMonitoringRest(parameters);
// Add a shutdown hook to shut down the rest services when the process is exiting
Runtime.getRuntime().addShutdownHook(new Thread(new ApexServicesShutdownHook()));
state = ServicesState.RUNNING;
if (parameters.getTimeToLive() == ApexMonitoringRestParameters.INFINITY_TIME_TO_LIVE) {
outStream.println(REST_ENDPOINT_PREFIX + this.toString() + ") started at "
+ parameters.getBaseUri().toString());
} else {
outStream.println(REST_ENDPOINT_PREFIX + this.toString() + ") started");
}
// Find out how long is left to wait
long timeRemaining = parameters.getTimeToLive();
while (timeRemaining == ApexMonitoringRestParameters.INFINITY_TIME_TO_LIVE || timeRemaining > 0) {
// decrement the time to live in the non-infinity case
if (timeRemaining > 0) {
timeRemaining--;
}
// Wait for a second
Thread.sleep(1000);
}
} catch (final Exception e) {
outStream.println(
REST_ENDPOINT_PREFIX + this.toString() + ") failed at with error: " + e.getMessage());
} finally {
if (apexMonitoringRest != null) {
apexMonitoringRest.shutdown();
apexMonitoringRest = null;
}
state = ServicesState.STOPPED;
}
}
/**
* Get services state.
*
* @return the service state
*/
public ServicesState getState() {
return state;
}
@Override
public String toString() {
final StringBuilder ret = new StringBuilder();
ret.append(this.getClass().getSimpleName()).append(": Config=[").append(this.parameters).append("], State=")
.append(this.getState());
return ret.toString();
}
/**
* Explicitly shut down the services.
*/
public void shutdown() {
if (apexMonitoringRest != null) {
outStream.println(REST_ENDPOINT_PREFIX + this.toString() + ") shutting down");
apexMonitoringRest.shutdown();
}
state = ServicesState.STOPPED;
outStream.println(REST_ENDPOINT_PREFIX + this.toString() + ") shut down");
}
/**
* This class is a shutdown hook for the Apex services command.
*/
private class ApexServicesShutdownHook implements Runnable {
/*
* (non-Javadoc)
*
* @see java.lang.Runnable#run()
*/
@Override
public void run() {
if (apexMonitoringRest != null) {
apexMonitoringRest.shutdown();
}
}
}
}
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