INT-4029: TCP: Add Buffer Pooling to Deserializers

JIRA: https://jira.spring.io/browse/INT-4029

Support the use of buffer pools in the deserializer code to
allow buffer reuse.

spring-integration-ip/src/test/java/org/springframework/integration/ip/tcp/serializer/PooledDeserializationTests.java

@@ -0,0 +1,72 @@
+/*
+ * Copyright 2016 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.ip.tcp.serializer;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNotSame;
+import static org.junit.Assert.fail;
+
+import java.io.ByteArrayInputStream;
+import java.io.IOException;
+import java.util.Set;
+
+import org.junit.Test;
+
+import org.springframework.integration.test.util.TestUtils;
+
+/**
+ * @author Gary Russell
+ * @since 4.3
+ *
+ */
+public class PooledDeserializationTests {
+
+	@Test
+	public void testCRLF() throws IOException {
+		ByteArrayCrLfSerializer deser = new ByteArrayCrLfSerializer();
+		deser.setPoolSize(2);
+		ByteArrayInputStream bais = new ByteArrayInputStream("foo\r\n".getBytes());
+		for (int i = 0; i < 5; i++) {
+			bais.reset();
+			byte[] bytes = deser.deserialize(bais);
+			assertEquals("foo", new String(bytes));
+		}
+		try {
+			deser.deserialize(bais);
+			fail("Expected SoftEndOfStreamException");
+		}
+		catch (SoftEndOfStreamException e) {
+			// expected
+		}
+		assertEquals(1, TestUtils.getPropertyValue(deser, "pool.allocated", Set.class).size());
+		assertEquals(0, TestUtils.getPropertyValue(deser, "pool.inUse", Set.class).size());
+	}
+
+	@Test
+	public void testRawMaxMessageSizeEqualDontReturnPooledItem() throws IOException {
+		ByteArrayRawSerializer deser = new ByteArrayRawSerializer();
+		deser.setPoolSize(2);
+		deser.setMaxMessageSize(3);
+		ByteArrayInputStream bais = new ByteArrayInputStream("foo".getBytes());
+		byte[] bytes = deser.deserialize(bais);
+		assertEquals("foo", new String(bytes));
+		assertEquals(1, TestUtils.getPropertyValue(deser, "pool.allocated", Set.class).size());
+		assertEquals(0, TestUtils.getPropertyValue(deser, "pool.inUse", Set.class).size());
+		assertNotSame(bytes, TestUtils.getPropertyValue(deser, "pool.allocated", Set.class).iterator().next());
+	}
+
+}