IFSImpl.java
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上传日期:2018-01-08
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- /**
- *
- * 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.
- *
- * @author: Sriram Rao (Kosmix Corp.)
- *
- * We need to provide the ability to the code in fs/kfs without really
- * having a KFS deployment. In particular, the glue code that wraps
- * around calls to KfsAccess object. This is accomplished by defining a
- * filesystem implementation interface:
- * -- for testing purposes, a dummy implementation of this interface
- * will suffice; as long as the dummy implementation is close enough
- * to doing what KFS does, we are good.
- * -- for deployment purposes with KFS, this interface is
- * implemented by the KfsImpl object.
- */
- package org.apache.hadoop.fs.kfs;
- import java.io.*;
- import org.apache.hadoop.fs.FSDataInputStream;
- import org.apache.hadoop.fs.FSDataOutputStream;
- import org.apache.hadoop.fs.FileStatus;
- import org.apache.hadoop.fs.Path;
- interface IFSImpl {
- public boolean exists(String path) throws IOException;
- public boolean isDirectory(String path) throws IOException;
- public boolean isFile(String path) throws IOException;
- public String[] readdir(String path) throws IOException;
- public FileStatus[] readdirplus(Path path) throws IOException;
- public int mkdirs(String path) throws IOException;
- public int rename(String source, String dest) throws IOException;
- public int rmdir(String path) throws IOException;
- public int remove(String path) throws IOException;
- public long filesize(String path) throws IOException;
- public short getReplication(String path) throws IOException;
- public short setReplication(String path, short replication) throws IOException;
- public String[][] getDataLocation(String path, long start, long len) throws IOException;
- public long getModificationTime(String path) throws IOException;
- public FSDataOutputStream create(String path, short replication, int bufferSize) throws IOException;
- public FSDataInputStream open(String path, int bufferSize) throws IOException;
-
- };