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/*-
* ============LICENSE_START=======================================================
* feature-simulators
* ================================================================================
* Copyright (C) 2017-2019 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.
* ============LICENSE_END=========================================================
*/
package org.onap.policy.drools.simulators;
import java.io.IOException;
import java.util.Map;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.TimeUnit;
import javax.servlet.http.HttpServletResponse;
import javax.ws.rs.Consumes;
import javax.ws.rs.DefaultValue;
import javax.ws.rs.GET;
import javax.ws.rs.POST;
import javax.ws.rs.Path;
import javax.ws.rs.PathParam;
import javax.ws.rs.QueryParam;
import javax.ws.rs.core.Context;
import javax.ws.rs.core.MediaType;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
@Path("/events")
public class DMaaPSimulatorJaxRs {
public static final String NO_TOPIC_MSG = "No topic";
public static final String NO_DATA_MSG = "No Data";
private static final Map<String, BlockingQueue<String>> queues = new ConcurrentHashMap<>();
private static final Logger logger = LoggerFactory.getLogger(DMaaPSimulatorJaxRs.class);
private static int responseCode = 200;
/**
* Get consumer ID.
*
* @param timeout timeout value
* @param topicName the dmaap topic
* @param httpResponse http response object
* @return topic or error message
*/
@GET
@Path("/{topicName}/{consumeGroup}/{consumerId}")
public String subscribe(@DefaultValue("0") @QueryParam("timeout") int timeout, @PathParam("topicName")
String topicName, @Context final HttpServletResponse httpResponse) {
int currentRespCode = responseCode;
httpResponse.setStatus(currentRespCode);
try {
httpResponse.flushBuffer();
} catch (IOException e) {
logger.error("flushBuffer threw: ", e);
return "Got an error";
}
if (currentRespCode < 200 || currentRespCode >= 300) {
return "You got response code: " + currentRespCode;
}
if (queues.containsKey(topicName)) {
return getNextMessageFromQueue(timeout, topicName);
}
else if (timeout > 0) {
return waitForNextMessageFromQueue(timeout, topicName);
}
return NO_TOPIC_MSG;
}
private String getNextMessageFromQueue(final int timeout, final String topicName) {
BlockingQueue<String> queue = queues.get(topicName);
String response = NO_DATA_MSG;
try {
response = poll(queue, timeout);
} catch (InterruptedException e) {
logger.debug("error in DMaaP simulator", e);
Thread.currentThread().interrupt();
}
if (response == null) {
response = NO_DATA_MSG;
}
return response;
}
protected String waitForNextMessageFromQueue(int timeout, String topicName) {
try {
sleep(timeout);
if (queues.containsKey(topicName)) {
BlockingQueue<String> queue = queues.get(topicName);
String response = queue.poll();
if (response == null) {
response = NO_DATA_MSG;
}
return response;
}
} catch (InterruptedException e) {
logger.debug("error in DMaaP simulator", e);
Thread.currentThread().interrupt();
}
return NO_TOPIC_MSG;
}
/**
* Post to a topic.
*
* @param topicName name of the topic
* @param body message
* @return empty string
*/
@POST
@Path("/{topicName}")
@Consumes(MediaType.TEXT_PLAIN)
public String publish(@PathParam("topicName") String topicName, String body) {
BlockingQueue<String> queue = queues.computeIfAbsent(topicName, entry -> new LinkedBlockingQueue<>());
queue.offer(body);
return "";
}
@POST
@Path("/setStatus")
public String setStatus(@QueryParam("statusCode") int statusCode) {
setResponseCode(statusCode);
return "Status code set";
}
// the following non-static methods may be overridden by junit tests
protected String poll(BlockingQueue<String> queue, final int timeout) throws InterruptedException {
return queue.poll(timeout, TimeUnit.MILLISECONDS);
}
protected void sleep(int timeout) throws InterruptedException {
Thread.sleep(timeout);
}
/**
* Static method to set static response code, synchronized for multiple possible uses.
*
* @param incomingResponseCode the response code to set
*/
private static synchronized void setResponseCode(final int incomingResponseCode) {
responseCode = incomingResponseCode;
}
/**
* Used only by junit tests to reset the simulator.
*/
protected static void reset() {
responseCode = 200;
queues.clear();
}
}
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