| /** |
| * 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.hdfs.server.namenode; |
| |
| import static org.junit.Assert.assertEquals; |
| import static org.junit.Assert.assertFalse; |
| import static org.junit.Assert.assertTrue; |
| import static org.junit.Assert.fail; |
| |
| import java.io.IOException; |
| |
| import org.apache.hadoop.io.DataOutputBuffer; |
| import org.junit.Test; |
| |
| public class TestEditsDoubleBuffer { |
| @Test |
| public void testDoubleBuffer() throws IOException { |
| EditsDoubleBuffer buf = new EditsDoubleBuffer(1024); |
| |
| assertTrue(buf.isFlushed()); |
| byte[] data = new byte[100]; |
| buf.writeRaw(data, 0, data.length); |
| assertEquals("Should count new data correctly", |
| data.length, buf.countBufferedBytes()); |
| |
| assertTrue("Writing to current buffer should not affect flush state", |
| buf.isFlushed()); |
| |
| // Swap the buffers |
| buf.setReadyToFlush(); |
| assertEquals("Swapping buffers should still count buffered bytes", |
| data.length, buf.countBufferedBytes()); |
| assertFalse(buf.isFlushed()); |
| |
| // Flush to a stream |
| DataOutputBuffer outBuf = new DataOutputBuffer(); |
| buf.flushTo(outBuf); |
| assertEquals(data.length, outBuf.getLength()); |
| assertTrue(buf.isFlushed()); |
| assertEquals(0, buf.countBufferedBytes()); |
| |
| // Write some more |
| buf.writeRaw(data, 0, data.length); |
| assertEquals("Should count new data correctly", |
| data.length, buf.countBufferedBytes()); |
| buf.setReadyToFlush(); |
| buf.flushTo(outBuf); |
| |
| assertEquals(data.length * 2, outBuf.getLength()); |
| |
| assertEquals(0, buf.countBufferedBytes()); |
| |
| outBuf.close(); |
| } |
| |
| @Test |
| public void shouldFailToCloseWhenUnflushed() throws IOException { |
| EditsDoubleBuffer buf = new EditsDoubleBuffer(1024); |
| buf.writeRaw(new byte[1], 0, 1); |
| try { |
| buf.close(); |
| fail("Did not fail to close with unflushed data"); |
| } catch (IOException ioe) { |
| if (!ioe.toString().contains("still to be flushed")) { |
| throw ioe; |
| } |
| } |
| } |
| } |