/**
* 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 com.facebook.swift.codec.ThriftConstructor;
import com.facebook.swift.codec.ThriftField;
import com.facebook.swift.codec.ThriftStruct;
import org.apache.hadoop.io.*;
import java.io.*;
import java.util.Arrays;
import java.util.List;
/****************************************************
* A LocatedBlock is a pair of Block, DatanodeInfo[]
* objects. It tells where to find a Block.
*
****************************************************/
@ThriftStruct
public class LocatedBlock implements Writable {
static { // register a ctor
WritableFactories.setFactory
(LocatedBlock.class,
new WritableFactory() {
public Writable newInstance() { return new LocatedBlock(); }
});
}
private Block 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;
/**
*/
public LocatedBlock() {
this(new Block(), new DatanodeInfo[0], 0L, false);
}
/**
*/
public LocatedBlock(Block b, DatanodeInfo[] locs) {
this(b, locs, -1, false); // startOffset is unknown
}
/**
*/
public LocatedBlock(Block b, DatanodeInfo[] locs, long startOffset) {
this(b, locs, startOffset, false);
}
/**
*/
public LocatedBlock(Block 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;
}
}
@ThriftConstructor
public LocatedBlock(@ThriftField(1) Block block, @ThriftField(2) List<DatanodeInfo> datanodes,
@ThriftField(3) long startOffset, @ThriftField(4) boolean corrupt) {
this(block, datanodes.toArray(new DatanodeInfo[datanodes.size()]), startOffset, corrupt);
}
/**
*/
@ThriftField(1)
public Block getBlock() {
return b;
}
/**
*/
public DatanodeInfo[] getLocations() {
return locs;
}
@ThriftField(2)
public List<DatanodeInfo> getDatanodes() {
return Arrays.asList(locs);
}
@ThriftField(3)
public long getStartOffset() {
return offset;
}
public void setBlockSize(long size) {
b.setNumBytes(size);
}
public long getBlockSize() {
return b.getNumBytes();
}
void setStartOffset(long value) {
this.offset = value;
}
void setCorrupt(boolean corrupt) {
this.corrupt = corrupt;
}
@ThriftField(value = 4, name = "corrupt")
public boolean isCorrupt() {
return this.corrupt;
}
///////////////////////////////////////////
// Writable
///////////////////////////////////////////
public void write(DataOutput out) throws IOException {
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 {
this.corrupt = in.readBoolean();
offset = in.readLong();
this.b = new Block();
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);
}
}
@Override
public String toString() {
return "[offset " + offset + " size " + getBlockSize() + " end " +
(offset + getBlockSize()) + "]";
}
public static void write(DataOutput out, LocatedBlock elem) throws IOException {
LocatedBlock block = new LocatedBlock(elem.getBlock(), elem.getLocations(),
elem.getStartOffset(), elem.isCorrupt());
block.write(out);
}
public static LocatedBlock read(DataInput in) throws IOException {
LocatedBlock block = new LocatedBlock();
block.readFields(in);
return block;
}
}