Added tests for PollingSourceAdapter.

spring-integration-core/src/test/java/org/springframework/integration/adapter/PollingSourceAdapterTests.java

@@ -0,0 +1,121 @@
+/*
+ * Copyright 2002-2007 the original author or authors.
+ *
+ * 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.
+ */
+
+package org.springframework.integration.adapter;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNotNull;
+import static org.junit.Assert.assertNull;
+
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.List;
+import java.util.concurrent.atomic.AtomicInteger;
+
+import org.junit.Test;
+
+import org.springframework.integration.MessageHandlingException;
+import org.springframework.integration.channel.PointToPointChannel;
+import org.springframework.integration.message.Message;
+
+/**
+ * @author Mark Fisher
+ */
+public class PollingSourceAdapterTests {
+
+	@Test
+	public void testPolledSourceSendsToChannel() {
+		TestSource source = new TestSource("testing", 1);
+		PointToPointChannel channel = new PointToPointChannel();
+		PollingSourceAdapter<String> adapter = new PollingSourceAdapter<String>(source, channel, 100);
+		adapter.receiveAndDispatch();
+		Message<?> message = channel.receive();
+		assertNotNull("message should not be null", message);
+		assertEquals("testing.1", message.getPayload());
+	}
+
+	@Test
+	public void testSendTimeout() {
+		TestSource source = new TestSource("testing", 1);
+		PointToPointChannel channel = new PointToPointChannel(1);
+		PollingSourceAdapter<String> adapter = new PollingSourceAdapter<String>(source, channel, 500);
+		adapter.setSendTimeout(10);
+		adapter.receiveAndDispatch();
+		adapter.receiveAndDispatch();
+		Message<?> message1 = channel.receive();
+		assertNotNull("message should not be null", message1);
+		assertEquals("testing.1", message1.getPayload());
+		Message<?> message2 = channel.receive(0);
+		assertNull("second message should be null", message2);
+		adapter.receiveAndDispatch();
+		Message<?> message3 = channel.receive(0);
+		assertNotNull("third message should not be null", message3);
+		assertEquals("testing.3", message3.getPayload());
+	}
+
+	@Test
+	public void testMultipleMessagesPerPoll() {
+		TestSource source = new TestSource("testing", 3);
+		PointToPointChannel channel = new PointToPointChannel();
+		PollingSourceAdapter<String> adapter = new PollingSourceAdapter<String>(source, channel, 1000);
+		adapter.setLimit(5);
+		adapter.receiveAndDispatch();
+		Message<?> message1 = channel.receive(0);
+		assertNotNull("message should not be null", message1);
+		assertEquals("testing.1", message1.getPayload());
+		Message<?> message2 = channel.receive(0);
+		assertNotNull("message should not be null", message2);
+		assertEquals("testing.2", message2.getPayload());
+		Message<?> message3 = channel.receive(0);
+		assertNotNull("message should not be null", message3);
+		assertEquals("testing.3", message3.getPayload());		
+		Message<?> message4 = channel.receive(0);
+		assertNull("message should be null", message4);
+	}
+
+	@Test(expected=MessageHandlingException.class)
+	public void testResultSizeExceedsLimit() {
+		TestSource source = new TestSource("testing", 3);
+		PointToPointChannel channel = new PointToPointChannel();
+		PollingSourceAdapter<String> adapter = new PollingSourceAdapter<String>(source, channel, 1000);
+		adapter.setLimit(2);
+		adapter.receiveAndDispatch();
+	}
+
+
+	private static class TestSource implements PollableSource<String> {
+
+		private String message;
+
+		private int messagesPerPoll;
+
+		private AtomicInteger count = new AtomicInteger();
+
+		public TestSource(String message, int messagesPerPoll) {
+			this.message = message;
+			this.messagesPerPoll = messagesPerPoll;
+		}
+
+		public Collection<String> poll(int limit) {
+			List<String> results = new ArrayList<String>(this.messagesPerPoll);
+			for (int i = 0; i < this.messagesPerPoll; i++) {
+				results.add(message + "." + count.incrementAndGet());
+			}
+			return results;
+		}
+	}
+
+}