Refine and document the ResultQueue a bit better.

spring-batch-infrastructure/src/test/java/org/springframework/batch/repeat/support/ThrottleLimitResultQueueTests.java

@@ -0,0 +1,89 @@
+/*
+ * Copyright 2006-2007 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.batch.repeat.support;
+
+import static org.junit.Assert.*;
+
+import java.util.NoSuchElementException;
+
+import org.junit.Test;
+
+
+/**
+ * @author Dave Syer
+ *
+ */
+public class ThrottleLimitResultQueueTests {
+	
+	private ThrottleLimitResultQueue<String> queue = new ThrottleLimitResultQueue<String>(1);
+	
+	@Test
+	public void testPutTake() throws Exception {
+		queue.expect();
+		assertTrue(queue.isExpecting());
+		assertTrue(queue.isEmpty());
+		queue.put("foo");
+		assertFalse(queue.isEmpty());
+		assertEquals("foo", queue.take());
+		assertFalse(queue.isExpecting());
+	}
+
+	@Test
+	public void testPutWithoutExpecting() throws Exception {
+		assertFalse(queue.isExpecting());
+		try {
+			queue.put("foo");
+			fail("Expected IllegalArgumentException");
+		} catch (IllegalArgumentException e) {
+			// expected
+		}
+	}
+
+	@Test
+	public void testTakeWithoutExpecting() throws Exception {
+		assertFalse(queue.isExpecting());
+		try {
+			queue.take();
+			fail("Expected NoSuchElementException");
+		} catch (NoSuchElementException e) {
+			// expected
+		}
+	}
+
+	@Test
+	public void testThrottleLimit() throws Exception {
+		queue.expect();
+		new Thread(new Runnable() {
+			public void run() {
+				try {
+					Thread.sleep(100L);
+				}
+				catch (InterruptedException e) {
+					e.printStackTrace();
+					Thread.currentThread().interrupt();
+				}
+				queue.put("foo");
+			}
+		}).start();
+		long t0 = System.currentTimeMillis();
+		queue.expect();
+		long t1 = System.currentTimeMillis();
+		assertEquals("foo", queue.take());
+		assertTrue(queue.isExpecting());
+		assertTrue("Did not block on expect (throttle limit should have been hit): time taken="+(t1-t0), t1-t0>50);
+	}
+
+}