Added MessageStore strategy and SimpleMessageStore implementation for in-memory storage with a BoundedHashMap.

spring-integration-core/src/test/java/org/springframework/integration/message/SimpleMessageStoreTests.java

@@ -0,0 +1,82 @@
+/*
+ * Copyright 2002-2008 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.message;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNotNull;
+import static org.junit.Assert.assertNull;
+
+import org.junit.Test;
+
+/**
+ * @author Mark Fisher
+ */
+public class SimpleMessageStoreTests {
+
+	@Test
+	public void testPut() {
+		SimpleMessageStore store = new SimpleMessageStore();
+		Message<?> message1 = new StringMessage("message-1");
+		Message<?> previous = store.put(1, message1);
+		assertNull(previous);
+		assertNotNull(store.get(1));
+		assertEquals(message1, store.get(1));
+	}
+
+	@Test
+	public void testReplace() {
+		SimpleMessageStore store = new SimpleMessageStore();
+		Message<?> messageA = new StringMessage("message-a");
+		Message<?> messageB = new StringMessage("message-b");
+		store.put(1, messageA);
+		Message<?> previous = store.put(1, messageB);
+		assertEquals(messageA, previous);
+		assertEquals(messageB, store.get(1));
+	}
+
+	@Test
+	public void testRemove() {
+		SimpleMessageStore store = new SimpleMessageStore();
+		Message<?> message = new StringMessage("message");
+		assertNull(store.remove(1));
+		store.put(1, message);
+		assertEquals(message, store.remove(1));
+	}
+
+	@Test
+	public void testCapacityEnforced() {
+		SimpleMessageStore store = new SimpleMessageStore(3);
+		Message<?> message1 = new StringMessage("message-1");
+		Message<?> message2 = new StringMessage("message-2");
+		Message<?> message3 = new StringMessage("message-3");
+		Message<?> message4 = new StringMessage("message-4");
+		store.put(1, message1);
+		store.put(2, message2);
+		store.put(3, message3);
+		assertEquals(3, store.size());
+		assertEquals(message1, store.get(1));
+		assertEquals(message2, store.get(2));
+		assertEquals(message3, store.get(3));
+		store.put(4, message4);
+		assertEquals(3, store.size());
+		assertNull(store.get(1));
+		assertEquals(message2, store.get(2));
+		assertEquals(message3, store.get(3));
+		assertEquals(message4, store.get(4));
+	}
+
+}

spring-integration-core/src/test/java/org/springframework/integration/util/BoundedHashMapTests.java

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+/*
+ * Copyright 2002-2008 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.util;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertTrue;
+
+import org.junit.Test;
+
+/**
+ * @author Mark Fisher
+ */
+public class BoundedHashMapTests {
+
+	@Test
+	public void testCapacityEnforced() {
+		BoundedHashMap<String, Integer> map = new BoundedHashMap<String, Integer>(3);
+		map.put("A", 1);
+		map.put("B", 2);
+		map.put("C", 3);
+		assertEquals(3, map.size());
+		assertTrue(map.containsKey("A"));
+		assertTrue(map.containsKey("B"));
+		assertTrue(map.containsKey("C"));
+		map.put("D", 4);
+		assertEquals(3, map.size());
+		assertFalse(map.containsKey("A"));
+		assertTrue(map.containsKey("B"));
+		assertTrue(map.containsKey("C"));
+		assertTrue(map.containsKey("D"));
+	}
+
+}