TestIFileStreams.java
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上传日期:2018-01-08
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- /**
- * 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.mapred;
- import org.apache.hadoop.fs.ChecksumException;
- import org.apache.hadoop.io.DataInputBuffer;
- import org.apache.hadoop.io.DataOutputBuffer;
- import junit.framework.TestCase;
- public class TestIFileStreams extends TestCase {
- public void testIFileStream() throws Exception {
- final int DLEN = 100;
- DataOutputBuffer dob = new DataOutputBuffer(DLEN + 4);
- IFileOutputStream ifos = new IFileOutputStream(dob);
- for (int i = 0; i < DLEN; ++i) {
- ifos.write(i);
- }
- ifos.close();
- DataInputBuffer dib = new DataInputBuffer();
- dib.reset(dob.getData(), DLEN + 4);
- IFileInputStream ifis = new IFileInputStream(dib, 104);
- for (int i = 0; i < DLEN; ++i) {
- assertEquals(i, ifis.read());
- }
- ifis.close();
- }
- public void testBadIFileStream() throws Exception {
- final int DLEN = 100;
- DataOutputBuffer dob = new DataOutputBuffer(DLEN + 4);
- IFileOutputStream ifos = new IFileOutputStream(dob);
- for (int i = 0; i < DLEN; ++i) {
- ifos.write(i);
- }
- ifos.close();
- DataInputBuffer dib = new DataInputBuffer();
- final byte[] b = dob.getData();
- ++b[17];
- dib.reset(b, DLEN + 4);
- IFileInputStream ifis = new IFileInputStream(dib, 104);
- int i = 0;
- try {
- while (i < DLEN) {
- if (17 == i) {
- assertEquals(18, ifis.read());
- } else {
- assertEquals(i, ifis.read());
- }
- ++i;
- }
- ifis.close();
- } catch (ChecksumException e) {
- assertEquals("Unexpected bad checksum", DLEN - 1, i);
- return;
- }
- fail("Did not detect bad data in checksum");
- }
- public void testBadLength() throws Exception {
- final int DLEN = 100;
- DataOutputBuffer dob = new DataOutputBuffer(DLEN + 4);
- IFileOutputStream ifos = new IFileOutputStream(dob);
- for (int i = 0; i < DLEN; ++i) {
- ifos.write(i);
- }
- ifos.close();
- DataInputBuffer dib = new DataInputBuffer();
- dib.reset(dob.getData(), DLEN + 4);
- IFileInputStream ifis = new IFileInputStream(dib, 100);
- int i = 0;
- try {
- while (i < DLEN - 8) {
- assertEquals(i++, ifis.read());
- }
- ifis.close();
- } catch (ChecksumException e) {
- assertEquals("Checksum before close", i, DLEN - 8);
- return;
- }
- fail("Did not detect bad data in checksum");
- }
- }