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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.
*/
package org.apache.samza.system;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.fail;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.NoSuchElementException;
import java.util.Set;
import org.apache.samza.Partition;
import org.junit.Test;
public class TestSystemStreamPartitionIterator {
private static final SystemStreamPartition SSP = new SystemStreamPartition("test", "test", new Partition(0));
@Test
public void testHasNextShouldWork() {
int numMessages = 10;
MockSystemConsumer consumer = new MockSystemConsumer(numMessages);
SystemStreamPartitionIterator iterator = new SystemStreamPartitionIterator(consumer, SSP);
while (iterator.hasNext()) {
assertEquals(--numMessages, iterator.next().getMessage());
}
assertFalse(iterator.hasNext());
assertEquals(0, numMessages);
}
@Test
public void testNextWithoutHasNextCallShouldWorkWhenAvailableAndFailWhenNot() {
int numMessages = 10;
MockSystemConsumer consumer = new MockSystemConsumer(numMessages);
SystemStreamPartitionIterator iterator = new SystemStreamPartitionIterator(consumer, SSP);
for (int i = 0; i < numMessages; ++i) {
assertEquals(numMessages - i - 1, iterator.next().getMessage());
}
assertFalse(iterator.hasNext());
try {
iterator.next();
fail("Expected not to get any more messages from iterator.");
} catch (NoSuchElementException e) {
// expected
}
}
@Test
public void testNoMessages() {
int numMessages = 0;
MockSystemConsumer consumer = new MockSystemConsumer(numMessages);
SystemStreamPartitionIterator iterator = new SystemStreamPartitionIterator(consumer, SSP);
assertFalse(iterator.hasNext());
try {
iterator.next();
fail("Expected not to get any more messages from iterator.");
} catch (NoSuchElementException e) {
// expected
}
}
public class MockSystemConsumer implements SystemConsumer {
private int numPollReturnsWithMessages;
public MockSystemConsumer(int numMessages) {
this.numPollReturnsWithMessages = numMessages;
}
@Override
public void start() {
}
@Override
public void stop() {
}
@Override
public void register(SystemStreamPartition systemStreamPartition, String startingOffset) {
}
@Override
public Map<SystemStreamPartition, List<IncomingMessageEnvelope>> poll(Set<SystemStreamPartition> systemStreamPartitions, long timeout) {
Map<SystemStreamPartition, List<IncomingMessageEnvelope>> systemStreamPartitionEnvelopes = new HashMap<SystemStreamPartition, List<IncomingMessageEnvelope>>();
for (SystemStreamPartition systemStreamPartition : systemStreamPartitions) {
List<IncomingMessageEnvelope> q = new ArrayList<IncomingMessageEnvelope>();
if (numPollReturnsWithMessages-- > 0) {
q.add(new IncomingMessageEnvelope(SSP, "", null, numPollReturnsWithMessages));
}
systemStreamPartitionEnvelopes.put(systemStreamPartition, q);
}
return systemStreamPartitionEnvelopes;
}
}
}