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NFS Client for Java - provides read/write access to data on NFS servers. The current implementation supports only NFS version 3.

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/**
 * Copyright 2016 EMC Corporation. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License").
 * You may not use this file except in compliance with the License.
 * A copy of the License is located at
 *
 * http://www.apache.org/licenses/LICENSE-2.0.txt
 *
 * or in the "license" file accompanying this file. This file 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 com.emc.ecs.nfsclient.nfs;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.emc.ecs.nfsclient.rpc.RpcException;
import com.emc.ecs.nfsclient.rpc.Xdr;

/**
 * The response, as specified by RFC 1813 (https://tools.ietf.org/html/rfc1813).
 * 
 * 

* Procedure WRITE writes data to a file. *

* * @author seibed */ public class NfsWriteResponse extends NfsResponseBase { private static final Logger _log = LoggerFactory.getLogger(NfsWriteResponse.class); /** * One of the values below. *
    *
  • UNSTABLE = 0 - Best effort was made, no promises.
  • *
  • DATA_SYNC = 1 - Committed all data to stable storage, plus enough * metadata for retrieval, before returning.
  • *
  • FILE_SYNC = 2 - Committed all data and metadata to stable storage * before returning.
  • *
*/ private int _committed; /** * The number of bytes of data written to the file. The server may write * fewer bytes than requested. If so, the actual number of bytes written * starting at location, offset, is returned. */ private int _count; /** * Weak cache consistency data for the file. */ private NfsWccData _fileWccData = new NfsWccData(); /** * This is a cookie that the client can use to determine whether the server * has changed state between a call to WRITE and a subsequent call to either * WRITE or COMMIT. This cookie must be consistent during a single instance * of the NFS version 3 protocol service and must be unique between * instances of the NFS version 3 protocol server, where uncommitted data * may be lost. */ private long _verf; /** * Creates the response, as specified by RFC 1813 * (https://tools.ietf.org/html/rfc1813). * *

* Procedure WRITE writes data to a file. *

* * @param nfsVersion * The NFS version number. This is ignored for now, as only NFSv3 * is supported, but is included to allow future support for * other versions. */ public NfsWriteResponse(int nfsVersion) { super(); } /* * (non-Javadoc) * * @see com.emc.ecs.nfsclient.nfs.NfsResponseBase#unmarshalling(com.emc.ecs. * nfsclient.rpc.Xdr) */ public void unmarshalling(Xdr xdr) throws RpcException { super.unmarshalling(xdr); _fileWccData = new NfsWccData(xdr); if (stateIsOk()) { _count = xdr.getInt(); _committed = xdr.getInt(); _verf = xdr.getLong(); _log.trace("committed {} verf {}", _committed, _verf); } } /** * @return One of the values below. *
    *
  • UNSTABLE = 0 - Best effort was made, no promises.
  • *
  • DATA_SYNC = 1 - Committed all data to stable storage, plus * enough metadata for retrieval, before returning.
  • *
  • FILE_SYNC = 2 - Committed all data and metadata to stable * storage before returning.
  • *
*/ public int getCommitted() { return _committed; } /** * @return The number of bytes of data written to the file. The server may * write fewer bytes than requested. If so, the actual number of * bytes written starting at location, offset, is * returned. */ public int getCount() { return _count; } /** * @return Weak cache consistency data for the file. */ public NfsWccData getFileWccData() { return _fileWccData; } /** * @return This is a cookie that the client can use to determine whether the * server has changed state between a call to WRITE and a subsequent * call to either WRITE or COMMIT. This cookie must be consistent * during a single instance of the NFS version 3 protocol service * and must be unique between instances of the NFS version 3 * protocol server, where uncommitted data may be lost. */ public long getVerf() { return _verf; } }




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