| /** |
| * 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.hadoop.ipc; |
| |
| import static org.junit.Assert.assertEquals; |
| import java.io.ByteArrayInputStream; |
| import java.io.DataInputStream; |
| import java.io.IOException; |
| import org.apache.hadoop.ipc.ResponseBuffer; |
| import org.junit.Test; |
| |
| /** Unit tests for ResponseBuffer. */ |
| public class TestResponseBuffer { |
| @Test |
| public void testBuffer() throws IOException { |
| final int startSize = 8; |
| final String empty = ""; |
| ResponseBuffer buf = new ResponseBuffer(startSize); |
| assertEquals(startSize, buf.capacity()); |
| |
| // verify it's initially empty |
| checkBuffer(buf, empty); |
| // write "nothing" and re-verify it's empty |
| buf.writeBytes(empty); |
| checkBuffer(buf, empty); |
| |
| // write to the buffer twice and verify it's properly encoded |
| String s1 = "testing123"; |
| buf.writeBytes(s1); |
| checkBuffer(buf, s1); |
| String s2 = "456!"; |
| buf.writeBytes(s2); |
| checkBuffer(buf, s1 + s2); |
| |
| // reset should not change length of underlying byte array |
| int length = buf.capacity(); |
| buf.reset(); |
| assertEquals(length, buf.capacity()); |
| checkBuffer(buf, empty); |
| |
| // setCapacity will change length of underlying byte array |
| buf.setCapacity(startSize); |
| assertEquals(startSize, buf.capacity()); |
| checkBuffer(buf, empty); |
| |
| // make sure it still works |
| buf.writeBytes(s1); |
| checkBuffer(buf, s1); |
| buf.writeBytes(s2); |
| checkBuffer(buf, s1 + s2); |
| } |
| |
| private void checkBuffer(ResponseBuffer buf, String expected) |
| throws IOException { |
| // buffer payload length matches expected length |
| int expectedLength = expected.getBytes().length; |
| assertEquals(expectedLength, buf.size()); |
| // buffer has the framing bytes (int) |
| byte[] framed = buf.toByteArray(); |
| assertEquals(expectedLength + 4, framed.length); |
| |
| // verify encoding of buffer: framing (int) + payload bytes |
| DataInputStream dis = |
| new DataInputStream(new ByteArrayInputStream(framed)); |
| assertEquals(expectedLength, dis.readInt()); |
| assertEquals(expectedLength, dis.available()); |
| byte[] payload = new byte[expectedLength]; |
| dis.readFully(payload); |
| assertEquals(expected, new String(payload)); |
| } |
| } |