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/*
* ============LICENSE_START=======================================================
* ONAP
* ================================================================================
* Copyright (C) 2018-2019 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.pooling;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;
import static org.mockito.ArgumentMatchers.any;
import static org.mockito.Mockito.doAnswer;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.when;
import static org.onap.policy.drools.pooling.PoolingProperties.PREFIX;
import com.google.gson.Gson;
import com.google.gson.JsonParseException;
import java.util.Arrays;
import java.util.Deque;
import java.util.IdentityHashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Properties;
import java.util.TreeMap;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.concurrent.atomic.AtomicReference;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import org.mockito.invocation.InvocationOnMock;
import org.mockito.stubbing.Answer;
import org.onap.policy.common.endpoints.event.comm.FilterableTopicSource;
import org.onap.policy.common.endpoints.event.comm.Topic;
import org.onap.policy.common.endpoints.event.comm.Topic.CommInfrastructure;
import org.onap.policy.common.endpoints.event.comm.TopicListener;
import org.onap.policy.common.endpoints.event.comm.TopicSink;
import org.onap.policy.common.endpoints.event.comm.TopicSource;
import org.onap.policy.drools.controller.DroolsController;
import org.onap.policy.drools.pooling.message.Message;
import org.onap.policy.drools.system.PolicyController;
import org.onap.policy.drools.system.PolicyEngine;
import org.onap.policy.drools.utils.Pair;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* End-to-end tests of the pooling feature. Launches one or more "hosts", each one having
* its own feature object. Uses real feature objects. However, the following are not:
* <dl>
* <dt>DMaaP sources and sinks</dt>
* <dd>simulated using queues. There is one queue for the external topic, and one queue
* for each host's internal topic. Messages published to the "admin" channel are simply
* sent to all of the hosts' internal topic queues</dd>
* <dt>PolicyEngine, PolicyController, DroolsController</dt>
* <dd>mocked</dd>
* </dl>
*
* <p>Invoke {@link #runSlow()}, before the test, to slow things down.
*/
public class FeatureTest {
private static final Logger logger = LoggerFactory.getLogger(FeatureTest.class);
/**
* Name of the topic used for inter-host communication.
*/
private static final String INTERNAL_TOPIC = "my.internal.topic";
/**
* Name of the topic from which "external" events "arrive".
*/
private static final String EXTERNAL_TOPIC = "my.external.topic";
/**
* Name of the controller.
*/
private static final String CONTROLLER1 = "controller.one";
private static long stdReactivateWaitMs = 200;
private static long stdIdentificationMs = 60;
private static long stdStartHeartbeatMs = 60;
private static long stdActiveHeartbeatMs = 50;
private static long stdInterHeartbeatMs = 5;
private static long stdOfflinePubWaitMs = 2;
private static long stdPollMs = 2;
private static long stdInterPollMs = 2;
private static long stdEventWaitSec = 10;
/**
* Used to decode events from the external topic.
*/
private static final Gson mapper = new Gson();
/**
* Used to identify the current context.
*/
private static final ThreadLocal<Context> currentContext = new ThreadLocal<Context>();
/**
* Context for the current test case.
*/
private Context ctx;
/**
* Setup.
*/
@Before
public void setUp() {
ctx = null;
}
/**
* Tear down.
*/
@After
public void tearDown() {
if (ctx != null) {
ctx.destroy();
}
}
@Test
public void test_SingleHost() throws Exception {
run(70, 1);
}
@Test
public void test_TwoHosts() throws Exception {
run(200, 2);
}
@Test
public void test_ThreeHosts() throws Exception {
run(200, 3);
}
private void run(int nmessages, int nhosts) throws Exception {
ctx = new Context(nmessages);
for (int x = 0; x < nhosts; ++x) {
ctx.addHost();
}
ctx.startHosts();
for (int x = 0; x < nmessages; ++x) {
ctx.offerExternal(makeMessage(x));
}
ctx.awaitEvents(stdEventWaitSec, TimeUnit.SECONDS);
assertEquals(0, ctx.getDecodeErrors());
assertEquals(0, ctx.getRemainingEvents());
ctx.checkAllSawAMsg();
}
private String makeMessage(int reqnum) {
return "{\"reqid\":\"req" + reqnum + "\", \"data\":\"hello " + reqnum + "\"}";
}
/**
* Invoke this to slow the timers down.
*/
protected static void runSlow() {
stdReactivateWaitMs = 10000;
stdIdentificationMs = 10000;
stdStartHeartbeatMs = 15000;
stdActiveHeartbeatMs = 12000;
stdInterHeartbeatMs = 5000;
stdOfflinePubWaitMs = 2;
stdPollMs = 2;
stdInterPollMs = 2000;
stdEventWaitSec = 1000;
}
/**
* Decodes an event.
*
* @param event event
* @return the decoded event, or {@code null} if it cannot be decoded
*/
private static Object decodeEvent(String event) {
try {
return mapper.fromJson(event, TreeMap.class);
} catch (JsonParseException e) {
logger.warn("cannot decode external event", e);
return null;
}
}
/**
* Context used for a single test case.
*/
private static class Context {
/**
* Hosts that have been added to this context.
*/
private final Deque<Host> hosts = new LinkedList<>();
/**
* Maps a drools controller to its policy controller.
*/
private final IdentityHashMap<DroolsController, PolicyController> drools2policy = new IdentityHashMap<>();
/**
* Maps a channel to its queue. Does <i>not</i> include the "admin" channel.
*/
private final ConcurrentMap<String, BlockingQueue<String>> channel2queue = new ConcurrentHashMap<>(7);
/**
* Queue for the external "DMaaP" topic.
*/
private final BlockingQueue<String> externalTopic = new LinkedBlockingQueue<String>();
/**
* Counts the number of decode errors.
*/
private final AtomicInteger numDecodeErrors = new AtomicInteger(0);
/**
* Number of events we're still waiting to receive.
*/
private final CountDownLatch eventCounter;
/**
* The current host. Set by {@link #withHost(Host, VoidFunction)} and used by
* {@link #getCurrentHost()}.
*/
private Host currentHost = null;
/**
* Constructor.
*
* @param nEvents number of events to be processed
*/
public Context(int events) {
eventCounter = new CountDownLatch(events);
}
/**
* Destroys the context, stopping any hosts that remain.
*/
public void destroy() {
stopHosts();
hosts.clear();
}
/**
* Creates and adds a new host to the context.
*
* @return the new Host
*/
public Host addHost() {
Host host = new Host(this);
hosts.add(host);
return host;
}
/**
* Starts the hosts.
*/
public void startHosts() {
hosts.forEach(host -> host.start());
}
/**
* Stops the hosts.
*/
public void stopHosts() {
hosts.forEach(host -> host.stop());
}
/**
* Verifies that all hosts processed at least one message.
*/
public void checkAllSawAMsg() {
int msgs = 0;
for (Host host : hosts) {
assertTrue("msgs=" + msgs, host.messageSeen());
++msgs;
}
}
/**
* Sets {@link #currentHost} to the specified host, and then invokes the given
* function. Resets {@link #currentHost} to {@code null} before returning.
*
* @param host host
* @param func function to invoke
*/
public void withHost(Host host, VoidFunction func) {
currentHost = host;
func.apply();
currentHost = null;
}
/**
* Offers an event to the external topic.
*
* @param event event
*/
public void offerExternal(String event) {
externalTopic.offer(event);
}
/**
* Adds an internal channel to the set of channels.
*
* @param channel channel
* @param queue the channel's queue
*/
public void addInternal(String channel, BlockingQueue<String> queue) {
channel2queue.put(channel, queue);
}
/**
* Offers a message to all internal channels.
*
* @param message message
*/
public void offerInternal(String message) {
channel2queue.values().forEach(queue -> queue.offer(message));
}
/**
* Offers amessage to an internal channel.
*
* @param channel channel
* @param message message
*/
public void offerInternal(String channel, String message) {
BlockingQueue<String> queue = channel2queue.get(channel);
if (queue != null) {
queue.offer(message);
}
}
/**
* Associates a controller with its drools controller.
*
* @param controller controller
* @param droolsController drools controller
*/
public void addController(PolicyController controller, DroolsController droolsController) {
drools2policy.put(droolsController, controller);
}
/**
* Get controller.
*
* @param droolsController drools controller
* @return the controller associated with a drools controller, or {@code null} if
* it has no associated controller
*/
public PolicyController getController(DroolsController droolsController) {
return drools2policy.get(droolsController);
}
/**
* Constructor.
*
* @return queue for the external topic
*/
public BlockingQueue<String> getExternalTopic() {
return externalTopic;
}
/**
* Get decode errors.
*
* @return the number of decode errors so far
*/
public int getDecodeErrors() {
return numDecodeErrors.get();
}
/**
* Increments the count of decode errors.
*/
public void bumpDecodeErrors() {
numDecodeErrors.incrementAndGet();
}
/**
* Get remaining events.
*
* @return the number of events that haven't been processed
*/
public long getRemainingEvents() {
return eventCounter.getCount();
}
/**
* Adds an event to the counter.
*/
public void addEvent() {
eventCounter.countDown();
}
/**
* Waits, for a period of time, for all events to be processed.
*
* @param time time
* @param units units
* @return {@code true} if all events have been processed, {@code false} otherwise
* @throws InterruptedException throws interrupted
*/
public boolean awaitEvents(long time, TimeUnit units) throws InterruptedException {
return eventCounter.await(time, units);
}
/**
* Gets the current host, provided this is used from within a call to
* {@link #withHost(Host, VoidFunction)}.
*
* @return the current host, or {@code null} if there is no current host
*/
public Host getCurrentHost() {
return currentHost;
}
}
/**
* Simulates a single "host".
*/
private static class Host {
private final Context context;
private final PoolingFeature feature;
/**
* {@code True} if this host has processed a message, {@code false} otherwise.
*/
private final AtomicBoolean sawMsg = new AtomicBoolean(false);
/**
* This host's internal "DMaaP" topic.
*/
private final BlockingQueue<String> msgQueue = new LinkedBlockingQueue<>();
/**
* Source that reads from the external topic and posts to the listener.
*/
private TopicSource externalSource;
// mock objects
private final PolicyEngine engine = mock(PolicyEngine.class);
private final ListenerController controller = mock(ListenerController.class);
private final DroolsController drools = mock(DroolsController.class);
/**
* Constructor.
*
* @param context context
*/
public Host(Context context) {
this.context = context;
when(controller.getName()).thenReturn(CONTROLLER1);
when(controller.getDrools()).thenReturn(drools);
// stop consuming events if the controller stops
when(controller.stop()).thenAnswer(args -> {
externalSource.unregister(controller);
return true;
});
doAnswer(new MyExternalTopicListener(context, this)).when(controller).onTopicEvent(any(), any(), any());
context.addController(controller, drools);
// arrange to read from the external topic
externalSource = new TopicSourceImpl(context, false);
feature = new PoolingFeatureImpl(context);
}
/**
* Get name.
*
* @return the host name
*/
public String getName() {
return feature.getHost();
}
/**
* Starts threads for the host so that it begins consuming from both the external
* "DMaaP" topic and its own internal "DMaaP" topic.
*/
public void start() {
context.withHost(this, () -> {
feature.beforeStart(engine);
feature.afterCreate(controller);
// assign the queue for this host's internal topic
context.addInternal(getName(), msgQueue);
feature.beforeStart(controller);
// start consuming events from the external topic
externalSource.register(controller);
feature.afterStart(controller);
});
}
/**
* Stops the host's threads.
*/
public void stop() {
feature.beforeStop(controller);
externalSource.unregister(controller);
feature.afterStop(controller);
}
/**
* Offers an event to the feature, before the policy controller handles it.
*
* @param protocol protocol
* @param topic2 topic
* @param event event
* @return {@code true} if the event was handled, {@code false} otherwise
*/
public boolean beforeOffer(CommInfrastructure protocol, String topic2, String event) {
return feature.beforeOffer(controller, protocol, topic2, event);
}
/**
* Offers an event to the feature, after the policy controller handles it.
*
* @param protocol protocol
* @param topic topic
* @param event event
* @param success success
* @return {@code true} if the event was handled, {@code false} otherwise
*/
public boolean afterOffer(CommInfrastructure protocol, String topic, String event, boolean success) {
return feature.afterOffer(controller, protocol, topic, event, success);
}
/**
* Offers an event to the feature, before the drools controller handles it.
*
* @param fact fact
* @return {@code true} if the event was handled, {@code false} otherwise
*/
public boolean beforeInsert(Object fact) {
return feature.beforeInsert(drools, fact);
}
/**
* Offers an event to the feature, after the drools controller handles it.
*
* @param fact fact
* @param successInsert {@code true} if it was successfully inserted by the drools
* controller, {@code false} otherwise
* @return {@code true} if the event was handled, {@code false} otherwise
*/
public boolean afterInsert(Object fact, boolean successInsert) {
return feature.afterInsert(drools, fact, successInsert);
}
/**
* Indicates that a message was seen for this host.
*/
public void sawMessage() {
sawMsg.set(true);
}
/**
* Message seen.
*
* @return {@code true} if a message was seen for this host, {@code false}
* otherwise
*/
public boolean messageSeen() {
return sawMsg.get();
}
/**
* Get internal queue.
*
* @return the queue associated with this host's internal topic
*/
public BlockingQueue<String> getInternalQueue() {
return msgQueue;
}
}
/**
* Listener for the external topic. Simulates the actions taken by
* <i>AggregatedPolicyController.onTopicEvent</i>.
*/
private static class MyExternalTopicListener implements Answer<Void> {
private final Context context;
private final Host host;
public MyExternalTopicListener(Context context, Host host) {
this.context = context;
this.host = host;
}
@Override
public Void answer(InvocationOnMock args) throws Throwable {
int index = 0;
CommInfrastructure commType = args.getArgument(index++);
String topic = args.getArgument(index++);
String event = args.getArgument(index++);
if (host.beforeOffer(commType, topic, event)) {
return null;
}
boolean result;
Object fact = decodeEvent(event);
if (fact == null) {
result = false;
context.bumpDecodeErrors();
} else {
result = true;
if (!host.beforeInsert(fact)) {
// feature did not handle it so we handle it here
host.afterInsert(fact, result);
host.sawMessage();
context.addEvent();
}
}
host.afterOffer(commType, topic, event, result);
return null;
}
}
/**
* Sink implementation that puts a message on the queue specified by the
* <i>channel</i> embedded within the message. If it's the "admin" channel, then the
* message is placed on all queues.
*/
private static class TopicSinkImpl extends TopicImpl implements TopicSink {
private final Context context;
/**
* Used to decode the messages so that the channel can be extracted.
*/
private final Serializer serializer = new Serializer();
/**
* Constructor.
*
* @param context context
*/
public TopicSinkImpl(Context context) {
this.context = context;
}
@Override
public synchronized boolean send(String message) {
if (!isAlive()) {
return false;
}
try {
Message msg = serializer.decodeMsg(message);
String channel = msg.getChannel();
if (Message.ADMIN.equals(channel)) {
// add to every queue
context.offerInternal(message);
} else {
// add to a specific queue
context.offerInternal(channel, message);
}
return true;
} catch (JsonParseException e) {
logger.warn("could not decode message: {}", message);
context.bumpDecodeErrors();
return false;
}
}
}
/**
* Source implementation that reads from a queue associated with a topic.
*/
private static class TopicSourceImpl extends TopicImpl implements FilterableTopicSource {
private final String topic;
/**
* Queue from which to retrieve messages.
*/
private final BlockingQueue<String> queue;
/**
* Manages the current consumer thread. The "first" item is used as a trigger to
* tell the thread to stop processing, while the "second" item is triggered <i>by
* the thread</i> when it completes.
*/
private AtomicReference<Pair<CountDownLatch, CountDownLatch>> pair = new AtomicReference<>(null);
/**
* Constructor.
*
* @param context context
* @param internal {@code true} if to read from the internal topic, {@code false}
* to read from the external topic
*/
public TopicSourceImpl(Context context, boolean internal) {
if (internal) {
this.topic = INTERNAL_TOPIC;
this.queue = context.getCurrentHost().getInternalQueue();
} else {
this.topic = EXTERNAL_TOPIC;
this.queue = context.getExternalTopic();
}
}
@Override
public void setFilter(String filter) {
logger.info("topic filter set to: {}", filter);
}
@Override
public String getTopic() {
return topic;
}
@Override
public boolean offer(String event) {
throw new UnsupportedOperationException("offer topic source");
}
/**
* Starts a thread that takes messages from the queue and gives them to the
* listener. Stops the thread of any previously registered listener.
*/
@Override
public void register(TopicListener listener) {
Pair<CountDownLatch, CountDownLatch> newPair = new Pair<>(new CountDownLatch(1), new CountDownLatch(1));
reregister(newPair);
Thread thread = new Thread(() -> {
try {
do {
processMessages(newPair.first(), listener);
}
while (!newPair.first().await(stdInterPollMs, TimeUnit.MILLISECONDS));
logger.info("topic source thread completed");
} catch (InterruptedException e) {
logger.warn("topic source thread aborted", e);
Thread.currentThread().interrupt();
} catch (RuntimeException e) {
logger.warn("topic source thread aborted", e);
}
newPair.second().countDown();
});
thread.setDaemon(true);
thread.start();
}
/**
* Stops the thread of <i>any</i> currently registered listener.
*/
@Override
public void unregister(TopicListener listener) {
reregister(null);
}
/**
* Registers a new "pair" with this source, stopping the consumer associated with
* any previous registration.
*
* @param newPair the new "pair", or {@code null} to unregister
*/
private void reregister(Pair<CountDownLatch, CountDownLatch> newPair) {
try {
Pair<CountDownLatch, CountDownLatch> oldPair = pair.getAndSet(newPair);
if (oldPair == null) {
if (newPair == null) {
// unregister was invoked twice in a row
logger.warn("re-unregister for topic source");
}
// no previous thread to stop
return;
}
// need to stop the previous thread
// tell it to stop
oldPair.first().countDown();
// wait for it to stop
if (!oldPair.second().await(2, TimeUnit.SECONDS)) {
logger.warn("old topic registration is still running");
}
} catch (InterruptedException e) {
logger.warn("old topic registration may still be running", e);
Thread.currentThread().interrupt();
}
if (newPair != null) {
// register was invoked twice in a row
logger.warn("re-register for topic source");
}
}
/**
* Polls for messages from the topic and offers them to the listener.
*
* @param stopped triggered if processing should stop
* @param listener listener
* @throws InterruptedException throws interrupted exception
*/
private void processMessages(CountDownLatch stopped, TopicListener listener) throws InterruptedException {
for (int x = 0; x < 5 && stopped.getCount() > 0; ++x) {
String msg = queue.poll(stdPollMs, TimeUnit.MILLISECONDS);
if (msg == null) {
return;
}
listener.onTopicEvent(CommInfrastructure.UEB, topic, msg);
}
}
}
/**
* Topic implementation. Most methods just throw
* {@link UnsupportedOperationException}.
*/
private static class TopicImpl implements Topic {
/**
* Constructor.
*/
public TopicImpl() {
super();
}
@Override
public String getTopic() {
return INTERNAL_TOPIC;
}
@Override
public String getEffectiveTopic() {
return INTERNAL_TOPIC;
}
@Override
public CommInfrastructure getTopicCommInfrastructure() {
throw new UnsupportedOperationException("topic protocol");
}
@Override
public List<String> getServers() {
throw new UnsupportedOperationException("topic servers");
}
@Override
public String[] getRecentEvents() {
throw new UnsupportedOperationException("topic events");
}
@Override
public void register(TopicListener topicListener) {
throw new UnsupportedOperationException("register topic");
}
@Override
public void unregister(TopicListener topicListener) {
throw new UnsupportedOperationException("unregister topic");
}
@Override
public synchronized boolean start() {
return true;
}
@Override
public synchronized boolean stop() {
return true;
}
@Override
public synchronized void shutdown() {
// do nothing
}
@Override
public synchronized boolean isAlive() {
return true;
}
@Override
public boolean lock() {
throw new UnsupportedOperationException("lock topicink");
}
@Override
public boolean unlock() {
throw new UnsupportedOperationException("unlock topic");
}
@Override
public boolean isLocked() {
throw new UnsupportedOperationException("topic isLocked");
}
}
/**
* Feature with overrides.
*/
private static class PoolingFeatureImpl extends PoolingFeature {
private final Context context;
/**
* Constructor.
*
* @param context context
*/
public PoolingFeatureImpl(Context context) {
this.context = context;
/*
* Note: do NOT extract anything from "context" at this point, because it
* hasn't been fully initialized yet
*/
}
@Override
public Properties getProperties(String featName) {
Properties props = new Properties();
props.setProperty(PoolingProperties.PROP_EXTRACTOR_PREFIX + ".java.util.Map", "${reqid}");
props.setProperty(specialize(PoolingProperties.FEATURE_ENABLED, CONTROLLER1), "true");
props.setProperty(specialize(PoolingProperties.POOLING_TOPIC, CONTROLLER1), INTERNAL_TOPIC);
props.setProperty(specialize(PoolingProperties.OFFLINE_LIMIT, CONTROLLER1), "10000");
props.setProperty(specialize(PoolingProperties.OFFLINE_AGE_MS, CONTROLLER1), "1000000");
props.setProperty(specialize(PoolingProperties.OFFLINE_PUB_WAIT_MS, CONTROLLER1),
"" + stdOfflinePubWaitMs);
props.setProperty(specialize(PoolingProperties.START_HEARTBEAT_MS, CONTROLLER1),
"" + stdStartHeartbeatMs);
props.setProperty(specialize(PoolingProperties.REACTIVATE_MS, CONTROLLER1), "" + stdReactivateWaitMs);
props.setProperty(specialize(PoolingProperties.IDENTIFICATION_MS, CONTROLLER1), "" + stdIdentificationMs);
props.setProperty(specialize(PoolingProperties.ACTIVE_HEARTBEAT_MS, CONTROLLER1),
"" + stdActiveHeartbeatMs);
props.setProperty(specialize(PoolingProperties.INTER_HEARTBEAT_MS, CONTROLLER1),
"" + stdInterHeartbeatMs);
return props;
}
@Override
public PolicyController getController(DroolsController droolsController) {
return context.getController(droolsController);
}
/**
* Embeds a specializer within a property name, after the prefix.
*
* @param propnm property name into which it should be embedded
* @param spec specializer to be embedded
* @return the property name, with the specializer embedded within it
*/
private String specialize(String propnm, String spec) {
String suffix = propnm.substring(PREFIX.length());
return PREFIX + spec + "." + suffix;
}
@Override
protected PoolingManagerImpl makeManager(String host, PolicyController controller, PoolingProperties props,
CountDownLatch activeLatch) {
currentContext.set(context);
return new PoolingManagerTest(host, controller, props, activeLatch);
}
}
/**
* Pooling Manager with overrides.
*/
private static class PoolingManagerTest extends PoolingManagerImpl {
/**
* Constructor.
*
* @param host the host
* @param controller the controller
* @param props the properties
* @param activeLatch the latch
*/
public PoolingManagerTest(String host, PolicyController controller, PoolingProperties props,
CountDownLatch activeLatch) {
super(host, controller, props, activeLatch);
}
@Override
protected DmaapManager makeDmaapManager(String topic) throws PoolingFeatureException {
return new DmaapManagerImpl(topic);
}
@Override
protected boolean canDecodeEvent(DroolsController drools, String topic) {
return true;
}
@Override
protected Object decodeEventWrapper(DroolsController drools, String topic, String event) {
return decodeEvent(event);
}
}
/**
* DMaaP Manager with overrides.
*/
private static class DmaapManagerImpl extends DmaapManager {
/**
* Constructor.
*
* @param context this manager's context
* @param topic the topic
* @throws PoolingFeatureException if an error occurs
*/
public DmaapManagerImpl(String topic) throws PoolingFeatureException {
super(topic);
}
@Override
protected List<TopicSource> getTopicSources() {
return Arrays.asList(new TopicSourceImpl(currentContext.get(), true));
}
@Override
protected List<TopicSink> getTopicSinks() {
return Arrays.asList(new TopicSinkImpl(currentContext.get()));
}
}
/**
* Controller that also implements the {@link TopicListener} interface.
*/
private static interface ListenerController extends PolicyController, TopicListener {
}
/**
* Simple function that takes no arguments and returns nothing.
*/
@FunctionalInterface
private static interface VoidFunction {
public void apply();
}
}
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