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/*-
* ============LICENSE_START=======================================================
* Copyright (C) 2019 Nordix Foundation.
* ================================================================================
* 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.models.sim.dmaap.provider;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.SortedMap;
import java.util.TreeMap;
import java.util.concurrent.TimeUnit;
import javax.ws.rs.core.Response;
import org.apache.commons.lang3.tuple.MutablePair;
import org.onap.policy.common.utils.coder.CoderException;
import org.onap.policy.common.utils.coder.StandardCoder;
import org.onap.policy.models.sim.dmaap.DmaapSimRuntimeException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Provider to simulate DMaaP.
*
* @author Liam Fallon (liam.fallon@est.tech)
*/
public class DmaapSimProvider {
private static final Logger LOGGER = LoggerFactory.getLogger(DmaapSimProvider.class);
// Recurring string constants
private static final String TOPIC_TAG = "Topic:";
// Time for a get to wait before checking of a message has come
private static final long DMAAP_SIM_WAIT_TIME = 50;
// recurring constants
private static final String WITH_TIMEOUT = " with timeout ";
// The map of topic messages
private static final Map<String, SortedMap<Integer, Object>> topicMessageMap = new LinkedHashMap<>();
// The map of topic messages
private static final Map<String, Map<String, MutablePair<Integer, String>>> consumerGroupsMap =
new LinkedHashMap<>();
/**
* Process a DMaaP message.
*
* @param topicName The topic name
* @param dmaapMessage the message to process
* @return a response to the message
*/
public Response processDmaapMessagePut(final String topicName, final Object dmaapMessage) {
LOGGER.debug(TOPIC_TAG + topicName + ", Received DMaaP message: " + dmaapMessage);
synchronized (topicMessageMap) {
SortedMap<Integer, Object> messageMap = topicMessageMap.get(topicName);
if (messageMap == null) {
messageMap = new TreeMap<>();
topicMessageMap.put(topicName, messageMap);
LOGGER.debug(TOPIC_TAG + topicName + ", created topic message map");
}
int nextKey = (messageMap.isEmpty() ? 0 : messageMap.lastKey() + 1);
messageMap.put(nextKey, dmaapMessage);
LOGGER.debug(TOPIC_TAG + topicName + ", cached DMaaP message " + nextKey + ": " + dmaapMessage);
}
return Response.status(Response.Status.OK).entity("{\n \"serverTimeMs\": 0,\n \"count\": 1\n}").build();
}
/**
* Wait for and return a DMaaP message.
*
* @param topicName The topic to wait on
* @param consumerGroup the consumer group that is waiting
* @param consumerId the consumer ID that is waiting
* @param timeout the length of time to wait for
* @return the DMaaP message or
*/
public Response processDmaapMessageGet(final String topicName, final String consumerGroup, final String consumerId,
final int timeout) {
LOGGER.debug(TOPIC_TAG + topicName + ", Request for DMaaP message: " + consumerGroup + ":" + consumerId
+ WITH_TIMEOUT + timeout);
MutablePair<Integer, String> consumerGroupPair = null;
synchronized (consumerGroupsMap) {
Map<String, MutablePair<Integer, String>> consumerGroupMap = consumerGroupsMap.get(topicName);
if (consumerGroupMap == null) {
consumerGroupMap = new LinkedHashMap<>();
consumerGroupsMap.put(topicName, consumerGroupMap);
LOGGER.trace(
TOPIC_TAG + topicName + ", Created consumer map entry for consumer group " + consumerGroup);
}
consumerGroupPair = consumerGroupMap.get(consumerGroup);
if (consumerGroupPair == null) {
consumerGroupPair = new MutablePair<>(-1, consumerId);
consumerGroupMap.put(consumerGroup, consumerGroupPair);
LOGGER.trace(TOPIC_TAG + topicName + ", Created consumer group entry for consumer group "
+ consumerGroup + ":" + consumerId);
}
}
long timeOfTimeout = System.currentTimeMillis() + timeout;
do {
Object waitingMessages = getWaitingMessages(topicName, consumerGroupPair);
if (waitingMessages != null) {
LOGGER.debug(TOPIC_TAG + topicName + ", Request for DMaaP message: " + consumerGroup + ":" + consumerId
+ WITH_TIMEOUT + timeout + ", returning messages " + waitingMessages);
return Response.status(Response.Status.OK).entity(waitingMessages).build();
}
try {
TimeUnit.MILLISECONDS.sleep(DMAAP_SIM_WAIT_TIME);
} catch (InterruptedException ie) {
String errorMessage = "Interrupt on wait on simulation of DMaaP topic " + topicName + " for request ID "
+ consumerGroup + ":" + consumerId + WITH_TIMEOUT + timeout;
LOGGER.warn(errorMessage, ie);
Thread.currentThread().interrupt();
throw new DmaapSimRuntimeException(errorMessage, ie);
}
}
while (timeOfTimeout > System.currentTimeMillis());
LOGGER.trace(TOPIC_TAG + topicName + ", timed out waiting for messages : " + consumerGroup + ":" + consumerId
+ WITH_TIMEOUT + timeout);
return Response.status(Response.Status.REQUEST_TIMEOUT).build();
}
/**
* Return any messages on this topic with a message number greater than the supplied message number.
*
* @param topicName the topic name to check
* @param consumerGroupPair the pair with the information on the last message retrieved
* @return the messages or null if there are none
*/
private Object getWaitingMessages(final String topicName, final MutablePair<Integer, String> consumerGroupPair) {
String foundMessageList = "[";
synchronized (topicMessageMap) {
SortedMap<Integer, Object> messageMap = topicMessageMap.get(topicName);
if (messageMap == null || messageMap.lastKey() <= consumerGroupPair.getLeft()) {
return null;
}
boolean first = true;
for (Object dmaapMessage : messageMap.tailMap(consumerGroupPair.getLeft() + 1).values()) {
if (first) {
first = false;
} else {
foundMessageList += ",";
}
try {
foundMessageList += new StandardCoder().encode(dmaapMessage);
} catch (CoderException ce) {
String errorMessage = "Encoding error on message on DMaaP topic " + topicName;
LOGGER.warn(errorMessage, ce);
return null;
}
}
foundMessageList += ']';
LOGGER.debug(TOPIC_TAG + topicName + ", returning DMaaP messages from " + consumerGroupPair.getLeft()
+ " to " + messageMap.lastKey());
synchronized (consumerGroupsMap) {
consumerGroupPair.setLeft(messageMap.lastKey());
}
}
return (foundMessageList.length() < 3 ? null : foundMessageList);
}
}
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