| /** |
| * 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.protocol; |
| |
| import org.apache.hadoop.classification.InterfaceAudience; |
| import org.apache.hadoop.classification.InterfaceStability; |
| import org.apache.hadoop.hdfs.security.token.block.BlockTokenIdentifier; |
| import org.apache.hadoop.io.*; |
| import org.apache.hadoop.security.token.Token; |
| |
| import java.io.*; |
| |
| /**************************************************** |
| * A LocatedBlock is a pair of Block, DatanodeInfo[] |
| * objects. It tells where to find a Block. |
| * |
| ****************************************************/ |
| @InterfaceAudience.Private |
| @InterfaceStability.Evolving |
| public class LocatedBlock implements Writable { |
| |
| static { // register a ctor |
| WritableFactories.setFactory |
| (LocatedBlock.class, |
| new WritableFactory() { |
| public Writable newInstance() { return new LocatedBlock(); } |
| }); |
| } |
| |
| private ExtendedBlock b; |
| private long offset; // offset of the first byte of the block in the file |
| private DatanodeInfo[] locs; |
| // corrupt flag is true if all of the replicas of a block are corrupt. |
| // else false. If block has few corrupt replicas, they are filtered and |
| // their locations are not part of this object |
| private boolean corrupt; |
| private Token<BlockTokenIdentifier> blockToken = new Token<BlockTokenIdentifier>(); |
| |
| public LocatedBlock() { |
| this(new ExtendedBlock(), new DatanodeInfo[0], 0L, false); |
| } |
| |
| |
| public LocatedBlock(ExtendedBlock eb) { |
| this(eb, new DatanodeInfo[0], 0L, false); |
| } |
| |
| public LocatedBlock(String bpid, Block b, DatanodeInfo[] locs) { |
| this(new ExtendedBlock(bpid, b), locs, -1, false); // startOffset is unknown |
| } |
| |
| public LocatedBlock(ExtendedBlock b, DatanodeInfo[] locs) { |
| this(b, locs, -1, false); // startOffset is unknown |
| } |
| |
| public LocatedBlock(ExtendedBlock b, DatanodeInfo[] locs, long startOffset) { |
| this(b, locs, startOffset, false); |
| } |
| |
| public LocatedBlock(ExtendedBlock b, DatanodeInfo[] locs, long startOffset, |
| boolean corrupt) { |
| this.b = b; |
| this.offset = startOffset; |
| this.corrupt = corrupt; |
| if (locs==null) { |
| this.locs = new DatanodeInfo[0]; |
| } else { |
| this.locs = locs; |
| } |
| } |
| |
| public Token<BlockTokenIdentifier> getBlockToken() { |
| return blockToken; |
| } |
| |
| public void setBlockToken(Token<BlockTokenIdentifier> token) { |
| this.blockToken = token; |
| } |
| |
| /** |
| */ |
| public ExtendedBlock getBlock() { |
| return b; |
| } |
| |
| /** |
| */ |
| public DatanodeInfo[] getLocations() { |
| return locs; |
| } |
| |
| public long getStartOffset() { |
| return offset; |
| } |
| |
| public long getBlockSize() { |
| return b.getNumBytes(); |
| } |
| |
| void setStartOffset(long value) { |
| this.offset = value; |
| } |
| |
| void setCorrupt(boolean corrupt) { |
| this.corrupt = corrupt; |
| } |
| |
| public boolean isCorrupt() { |
| return this.corrupt; |
| } |
| |
| /////////////////////////////////////////// |
| // Writable |
| /////////////////////////////////////////// |
| public void write(DataOutput out) throws IOException { |
| blockToken.write(out); |
| out.writeBoolean(corrupt); |
| out.writeLong(offset); |
| b.write(out); |
| out.writeInt(locs.length); |
| for (int i = 0; i < locs.length; i++) { |
| locs[i].write(out); |
| } |
| } |
| |
| public void readFields(DataInput in) throws IOException { |
| blockToken.readFields(in); |
| this.corrupt = in.readBoolean(); |
| offset = in.readLong(); |
| this.b = new ExtendedBlock(); |
| b.readFields(in); |
| int count = in.readInt(); |
| this.locs = new DatanodeInfo[count]; |
| for (int i = 0; i < locs.length; i++) { |
| locs[i] = new DatanodeInfo(); |
| locs[i].readFields(in); |
| } |
| } |
| |
| /** Read LocatedBlock from in. */ |
| public static LocatedBlock read(DataInput in) throws IOException { |
| final LocatedBlock lb = new LocatedBlock(); |
| lb.readFields(in); |
| return lb; |
| } |
| |
| @Override |
| public String toString() { |
| return getClass().getSimpleName() + "{" + b |
| + "; getBlockSize()=" + getBlockSize() |
| + "; corrupt=" + corrupt |
| + "; offset=" + offset |
| + "; locs=" + java.util.Arrays.asList(locs) |
| + "}"; |
| } |
| } |