| /* |
| * 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.mapreduce.counters; |
| |
| import java.io.DataInput; |
| import java.io.DataOutput; |
| import java.io.IOException; |
| |
| import org.apache.hadoop.classification.InterfaceAudience; |
| import org.apache.hadoop.io.Text; |
| import org.apache.hadoop.io.WritableUtils; |
| import org.apache.hadoop.mapreduce.Counter; |
| import org.apache.hadoop.util.StringInterner; |
| |
| /** |
| * A generic counter implementation |
| */ |
| @InterfaceAudience.Private |
| public class GenericCounter extends AbstractCounter { |
| |
| private String name; |
| private String displayName; |
| private long value = 0; |
| |
| public GenericCounter() { |
| // mostly for readFields |
| } |
| |
| public GenericCounter(String name, String displayName) { |
| this.name = name; |
| this.displayName = displayName; |
| } |
| |
| public GenericCounter(String name, String displayName, long value) { |
| this.name = name; |
| this.displayName = displayName; |
| this.value = value; |
| } |
| |
| @Override @Deprecated |
| public synchronized void setDisplayName(String displayName) { |
| this.displayName = displayName; |
| } |
| |
| @Override |
| public synchronized void readFields(DataInput in) throws IOException { |
| name = StringInterner.weakIntern(Text.readString(in)); |
| displayName = in.readBoolean() ? |
| StringInterner.weakIntern(Text.readString(in)) : name; |
| value = WritableUtils.readVLong(in); |
| } |
| |
| /** |
| * GenericCounter ::= keyName isDistinctDisplayName [displayName] value |
| */ |
| @Override |
| public synchronized void write(DataOutput out) throws IOException { |
| Text.writeString(out, name); |
| boolean distinctDisplayName = ! name.equals(displayName); |
| out.writeBoolean(distinctDisplayName); |
| if (distinctDisplayName) { |
| Text.writeString(out, displayName); |
| } |
| WritableUtils.writeVLong(out, value); |
| } |
| |
| @Override |
| public synchronized String getName() { |
| return name; |
| } |
| |
| @Override |
| public synchronized String getDisplayName() { |
| return displayName; |
| } |
| |
| @Override |
| public synchronized long getValue() { |
| return value; |
| } |
| |
| @Override |
| public synchronized void setValue(long value) { |
| this.value = value; |
| } |
| |
| @Override |
| public synchronized void increment(long incr) { |
| value += incr; |
| } |
| |
| @Override |
| public Counter getUnderlyingCounter() { |
| return this; |
| } |
| } |