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/*-
* ============LICENSE_START=======================================================
* ONAP
* ================================================================================
* Copyright (C) 2020-2021 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.
* ============LICENSE_END=========================================================
*/
package org.onap.policy.common.endpoints.event.comm.client;
import static org.assertj.core.api.Assertions.assertThat;
import static org.assertj.core.api.Assertions.assertThatThrownBy;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNotNull;
import static org.junit.Assert.assertNotSame;
import static org.junit.Assert.assertSame;
import static org.junit.Assert.assertTrue;
import static org.mockito.ArgumentMatchers.any;
import static org.mockito.ArgumentMatchers.anyString;
import static org.mockito.Mockito.atLeast;
import static org.mockito.Mockito.verify;
import static org.mockito.Mockito.when;
import java.util.Arrays;
import java.util.Properties;
import java.util.concurrent.Semaphore;
import java.util.concurrent.TimeUnit;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
import org.junit.After;
import org.junit.AfterClass;
import org.junit.Before;
import org.junit.BeforeClass;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.mockito.ArgumentCaptor;
import org.mockito.Mock;
import org.mockito.junit.MockitoJUnitRunner;
import org.onap.policy.common.endpoints.event.comm.Topic.CommInfrastructure;
import org.onap.policy.common.endpoints.event.comm.TopicEndpoint;
import org.onap.policy.common.endpoints.event.comm.TopicEndpointManager;
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.common.utils.coder.Coder;
import org.onap.policy.common.utils.coder.CoderException;
import org.onap.policy.common.utils.coder.StandardCoder;
@RunWith(MockitoJUnitRunner.class)
public class BidirectionalTopicClientTest {
private static final Coder coder = new StandardCoder();
private static final long MAX_WAIT_MS = 5000;
private static final long SHORT_WAIT_MS = 1;
private static final String SINK_TOPIC = "my-sink-topic";
private static final String SOURCE_TOPIC = "my-source-topic";
private static final String MY_TEXT = "my-text";
private static final CommInfrastructure SINK_INFRA = CommInfrastructure.UEB;
private static final CommInfrastructure SOURCE_INFRA = CommInfrastructure.NOOP;
@Mock
private TopicSink sink;
@Mock
private TopicSource source;
@Mock
private TopicEndpoint endpoint;
@Mock
private TopicListener listener;
private MyMessage theMessage;
private BidirectionalTopicClient client;
private Context context;
/**
* Configures the endpoints.
*/
@BeforeClass
public static void setUpBeforeClass() {
Properties props = new Properties();
props.setProperty("noop.sink.topics", SINK_TOPIC);
props.setProperty("noop.source.topics", SOURCE_TOPIC);
// clear all topics and then configure one sink and one source
TopicEndpointManager.getManager().shutdown();
TopicEndpointManager.getManager().addTopicSinks(props);
TopicEndpointManager.getManager().addTopicSources(props);
}
@AfterClass
public static void tearDownAfterClass() {
// clear all topics after the tests
TopicEndpointManager.getManager().shutdown();
}
/**
* Creates mocks and an initial client object.
*/
@Before
public void setUp() throws Exception {
when(sink.send(anyString())).thenReturn(true);
when(sink.getTopicCommInfrastructure()).thenReturn(SINK_INFRA);
when(source.offer(anyString())).thenReturn(true);
when(source.getTopicCommInfrastructure()).thenReturn(SOURCE_INFRA);
when(endpoint.getTopicSinks(anyString())).thenReturn(Arrays.asList());
when(endpoint.getTopicSinks(SINK_TOPIC)).thenReturn(Arrays.asList(sink));
when(endpoint.getTopicSources(any())).thenReturn(Arrays.asList());
when(endpoint.getTopicSources(Arrays.asList(SOURCE_TOPIC))).thenReturn(Arrays.asList(source));
theMessage = new MyMessage(MY_TEXT);
client = new BidirectionalTopicClient2(SINK_TOPIC, SOURCE_TOPIC);
context = new Context();
}
@After
public void tearDown() {
context.stop();
}
@Test
public void testBidirectionalTopicClient_testGetters() {
assertSame(sink, client.getSink());
assertSame(source, client.getSource());
assertEquals(SINK_TOPIC, client.getSinkTopic());
assertEquals(SOURCE_TOPIC, client.getSourceTopic());
assertEquals(SINK_INFRA, client.getSinkTopicCommInfrastructure());
assertEquals(SOURCE_INFRA, client.getSourceTopicCommInfrastructure());
}
/**
* Tests the constructor when the sink or source cannot be found.
*/
@Test
public void testBidirectionalTopicClientExceptions() {
assertThatThrownBy(() -> new BidirectionalTopicClient2("unknown-sink", SOURCE_TOPIC))
.isInstanceOf(BidirectionalTopicClientException.class)
.hasMessage("no sinks for topic: unknown-sink");
assertThatThrownBy(() -> new BidirectionalTopicClient2(SINK_TOPIC, "unknown-source"))
.isInstanceOf(BidirectionalTopicClientException.class)
.hasMessage("no sources for topic: unknown-source");
// too many sources
when(endpoint.getTopicSources(Arrays.asList(SOURCE_TOPIC))).thenReturn(Arrays.asList(source, source));
assertThatThrownBy(() -> new BidirectionalTopicClient2(SINK_TOPIC, SOURCE_TOPIC))
.isInstanceOf(BidirectionalTopicClientException.class)
.hasMessage("too many sources for topic: my-source-topic");
}
/**
* Tests the "delegate" methods.
*/
@Test
public void testDelegates() {
assertTrue(client.send("hello"));
verify(sink).send("hello");
assertTrue(client.offer("incoming"));
verify(source).offer("incoming");
client.register(listener);
verify(source).register(listener);
client.unregister(listener);
verify(source).unregister(listener);
}
@Test
public void testGetTopicEndpointManager() throws BidirectionalTopicClientException {
// use a real manager
client = new BidirectionalTopicClient(SINK_TOPIC, SOURCE_TOPIC);
assertNotNull(client.getTopicEndpointManager());
assertNotNull(client.getSink());
assertNotNull(client.getSource());
assertNotSame(sink, client.getSink());
assertNotSame(source, client.getSource());
}
@Test
public void testAwaitReceipt() throws Exception {
context.start(theMessage);
assertThat(context.awaitSend(1)).isTrue();
verify(source).register(any());
verify(sink, atLeast(1)).send(any());
assertThat(context.checker.isReady()).isFalse();
inject(theMessage);
verifyReceipt();
}
@Test
public void testAwaitReceipt_AlreadyDone() throws Exception {
context.start(theMessage);
assertThat(context.awaitSend(1)).isTrue();
inject(theMessage);
verifyReceipt();
// calling again should result in "true" again, without injecting message
context.start(theMessage);
verifyReceipt();
}
@Test
public void testAwaitReceipt_MessageDoesNotMatch() throws Exception {
context.start(theMessage);
assertThat(context.awaitSend(1)).isTrue();
// non-matching message
inject("{}");
// wait for a few more calls to "send" and then inject a matching message
assertThat(context.awaitSend(3)).isTrue();
inject(theMessage);
verifyReceipt();
}
@Test
public void testAwaitReceipt_DecodeFails() throws Exception {
context.start(theMessage);
assertThat(context.awaitSend(1)).isTrue();
// force a failure and inject the message
context.forceDecodeFailure = true;
inject(theMessage);
assertThat(context.awaitDecodeFailure()).isTrue();
// no more failures
context.forceDecodeFailure = false;
inject(theMessage);
verifyReceipt();
}
@Test
public void testAwaitReceipt_Interrupted() throws InterruptedException {
context.start(theMessage);
assertThat(context.awaitSend(1)).isTrue();
context.interrupt();
verifyNoReceipt();
}
@Test
public void testAwaitReceipt_MultipleLoops() throws Exception {
context.start(theMessage);
// wait for multiple "send" calls
assertThat(context.awaitSend(3)).isTrue();
inject(theMessage);
verifyReceipt();
}
@Test
public void testStop() throws InterruptedException {
context.start(theMessage);
assertThat(context.awaitSend(1)).isTrue();
context.stop();
verifyNoReceipt();
}
/**
* Verifies that awaitReceipt() returns {@code true}.
*
* @throws InterruptedException if interrupted while waiting for the thread to
* terminate
*/
private void verifyReceipt() throws InterruptedException {
assertThat(context.join()).isTrue();
assertThat(context.result).isTrue();
assertThat(context.exception).isNull();
assertThat(context.checker.isReady()).isTrue();
verify(source).unregister(any());
}
/**
* Verifies that awaitReceipt() returns {@code false}.
*
* @throws InterruptedException if interrupted while waiting for the thread to
* terminate
*/
private void verifyNoReceipt() throws InterruptedException {
assertThat(context.join()).isTrue();
assertThat(context.result).isFalse();
assertThat(context.exception).isNull();
assertThat(context.checker.isReady()).isFalse();
verify(source).unregister(any());
}
/**
* Injects a message into the source topic.
*
* @param message message to be injected
* @throws CoderException if the message cannot be encoded
*/
private void inject(MyMessage message) throws CoderException {
inject(coder.encode(message));
}
/**
* Injects a message into the source topic.
*
* @param message message to be injected
*/
private void inject(String message) {
ArgumentCaptor<TopicListener> cap = ArgumentCaptor.forClass(TopicListener.class);
verify(source).register(cap.capture());
cap.getValue().onTopicEvent(SOURCE_INFRA, SOURCE_TOPIC, message);
}
/**
* BidirectionalTopicClient with some overrides.
*/
private class BidirectionalTopicClient2 extends BidirectionalTopicClient {
public BidirectionalTopicClient2(String sinkTopic, String sourceTopic)
throws BidirectionalTopicClientException {
super(sinkTopic, sourceTopic);
}
@Override
protected TopicEndpoint getTopicEndpointManager() {
return endpoint;
}
}
private class Context {
private Thread thread;
private boolean result;
private Exception exception;
private boolean forceDecodeFailure;
// released every time the checker publishes a message
private final Semaphore sendSem = new Semaphore(0);
// released every time a message-decode fails
private final Semaphore decodeFailedSem = new Semaphore(0);
private final BidirectionalTopicClient2 checker;
public Context() throws BidirectionalTopicClientException {
checker = new BidirectionalTopicClient2(SINK_TOPIC, SOURCE_TOPIC) {
@Override
public boolean send(String messageText) {
boolean result = super.send(messageText);
sendSem.release();
return result;
}
@Override
protected <T> T decode(String msg, Class<? extends T> clazz) throws CoderException {
if (forceDecodeFailure) {
throw new CoderException("expected exception");
}
return super.decode(msg, clazz);
}
@Override
protected void decodeFailed() {
super.decodeFailed();
decodeFailedSem.release();
}
};
}
/**
* Starts the thread.
*
* @param message message to be sent to the sink topic
*/
public void start(MyMessage message) {
thread = new Thread() {
@Override
public void run() {
try {
result = checker.awaitReady(message, SHORT_WAIT_MS);
} catch (Exception e) {
exception = e;
}
}
};
thread.setDaemon(true);
thread.start();
}
public void stop() {
checker.stopWaiting();
}
public boolean join() throws InterruptedException {
thread.join(MAX_WAIT_MS);
return !thread.isAlive();
}
public void interrupt() {
thread.interrupt();
}
public boolean awaitSend(int npermits) throws InterruptedException {
return sendSem.tryAcquire(npermits, MAX_WAIT_MS, TimeUnit.MILLISECONDS);
}
public boolean awaitDecodeFailure() throws InterruptedException {
return decodeFailedSem.tryAcquire(MAX_WAIT_MS, TimeUnit.MILLISECONDS);
}
}
@Data
@NoArgsConstructor
@AllArgsConstructor
public static class MyMessage {
private String text;
}
}
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