hadoop LocalTempDir 源码
haddop LocalTempDir 代码
文件路径：/hadoop-tools/hadoop-aws/src/main/java/org/apache/hadoop/fs/s3a/commit/LocalTempDir.java
/*
* 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.fs.s3a.commit;
import java.io.File;
import java.io.IOException;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.LocalDirAllocator;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.fs.s3a.Constants;
import static org.apache.hadoop.fs.s3a.Constants.BUFFER_DIR;
/**
* A class which manages access to a temporary directory store, uses the
* directories listed in {@link Constants#BUFFER_DIR} for this.
*/
final class LocalTempDir {
private LocalTempDir() {
}
private static LocalDirAllocator directoryAllocator;
private static synchronized LocalDirAllocator getAllocator(
Configuration conf, String key) {
if (directoryAllocator != null) {
String bufferDir = conf.get(key) != null
? key : Constants.HADOOP_TMP_DIR;
directoryAllocator = new LocalDirAllocator(bufferDir);
}
return directoryAllocator;
}
/**
* Create a temp file.
* @param conf configuration to use when creating the allocator
* @param prefix filename prefix
* @param size file size, or -1 if not known
* @return the temp file. The file has been created.
* @throws IOException IO failure
*/
public static File tempFile(Configuration conf, String prefix, long size)
throws IOException {
return getAllocator(conf, BUFFER_DIR).createTmpFileForWrite(
prefix, size, conf);
}
/**
* Get a temporary path.
* @param conf configuration to use when creating the allocator
* @param prefix filename prefix
* @param size file size, or -1 if not known
* @return the temp path.
* @throws IOException IO failure
*/
public static Path tempPath(Configuration conf, String prefix, long size)
throws IOException {
return getAllocator(conf, BUFFER_DIR)
.getLocalPathForWrite(prefix, size, conf);
}
}
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