?? locatedblock.java
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/** * Copyright 2005 The Apache Software Foundation * * 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. */package org.apache.hadoop.dfs;import org.apache.hadoop.io.*;import java.io.*;/**************************************************** * A LocatedBlock is a pair of Block, DatanodeInfo[] * objects. It tells where to find a Block. * * @author Michael Cafarella ****************************************************/class LocatedBlock implements Writable { static { // register a ctor WritableFactories.setFactory (LocatedBlock.class, new WritableFactory() { public Writable newInstance() { return new LocatedBlock(); } }); } Block b; DatanodeInfo locs[]; /** */ public LocatedBlock() { this.b = new Block(); this.locs = new DatanodeInfo[0]; } /** */ public LocatedBlock(Block b, DatanodeInfo[] locs) { this.b = b; this.locs = locs; } /** */ public Block getBlock() { return b; } /** */ DatanodeInfo[] getLocations() { return locs; } /////////////////////////////////////////// // Writable /////////////////////////////////////////// public void write(DataOutput out) throws IOException { 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.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); } }}
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