JobBase.java
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上传日期:2018-01-08
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文件大小:5k
- /**
- * 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.contrib.utils.join;
- import java.util.SortedMap;
- import java.util.TreeMap;
- import java.util.Map.Entry;
- import java.util.Iterator;
- import org.apache.commons.logging.Log;
- import org.apache.commons.logging.LogFactory;
- import org.apache.hadoop.mapred.JobConf;
- import org.apache.hadoop.mapred.Mapper;
- import org.apache.hadoop.mapred.Reducer;
- /**
- * A common base implementing some statics collecting mechanisms that are
- * commonly used in a typical map/reduce job.
- *
- */
- public abstract class JobBase implements Mapper, Reducer {
- public static final Log LOG = LogFactory.getLog("datajoin.job");
- private SortedMap<Object, Long> longCounters = null;
- private SortedMap<Object, Double> doubleCounters = null;
- /**
- * Set the given counter to the given value
- *
- * @param name
- * the counter name
- * @param value
- * the value for the counter
- */
- protected void setLongValue(Object name, long value) {
- this.longCounters.put(name, new Long(value));
- }
- /**
- * Set the given counter to the given value
- *
- * @param name
- * the counter name
- * @param value
- * the value for the counter
- */
- protected void setDoubleValue(Object name, double value) {
- this.doubleCounters.put(name, new Double(value));
- }
- /**
- *
- * @param name
- * the counter name
- * @return return the value of the given counter.
- */
- protected Long getLongValue(Object name) {
- return this.longCounters.get(name);
- }
- /**
- *
- * @param name
- * the counter name
- * @return return the value of the given counter.
- */
- protected Double getDoubleValue(Object name) {
- return this.doubleCounters.get(name);
- }
- /**
- * Increment the given counter by the given incremental value If the counter
- * does not exist, one is created with value 0.
- *
- * @param name
- * the counter name
- * @param inc
- * the incremental value
- * @return the updated value.
- */
- protected Long addLongValue(Object name, long inc) {
- Long val = this.longCounters.get(name);
- Long retv = null;
- if (val == null) {
- retv = new Long(inc);
- } else {
- retv = new Long(val.longValue() + inc);
- }
- this.longCounters.put(name, retv);
- return retv;
- }
- /**
- * Increment the given counter by the given incremental value If the counter
- * does not exist, one is created with value 0.
- *
- * @param name
- * the counter name
- * @param inc
- * the incremental value
- * @return the updated value.
- */
- protected Double addDoubleValue(Object name, double inc) {
- Double val = this.doubleCounters.get(name);
- Double retv = null;
- if (val == null) {
- retv = new Double(inc);
- } else {
- retv = new Double(val.doubleValue() + inc);
- }
- this.doubleCounters.put(name, retv);
- return retv;
- }
- /**
- * log the counters
- *
- */
- protected void report() {
- LOG.info(getReport());
- }
- /**
- * log the counters
- *
- */
- protected String getReport() {
- StringBuffer sb = new StringBuffer();
- Iterator iter = this.longCounters.entrySet().iterator();
- while (iter.hasNext()) {
- Entry e = (Entry) iter.next();
- sb.append(e.getKey().toString()).append("t").append(e.getValue())
- .append("n");
- }
- iter = this.doubleCounters.entrySet().iterator();
- while (iter.hasNext()) {
- Entry e = (Entry) iter.next();
- sb.append(e.getKey().toString()).append("t").append(e.getValue())
- .append("n");
- }
- return sb.toString();
- }
- /**
- * Initializes a new instance from a {@link JobConf}.
- *
- * @param job
- * the configuration
- */
- public void configure(JobConf job) {
- this.longCounters = new TreeMap<Object, Long>();
- this.doubleCounters = new TreeMap<Object, Double>();
- }
- }