metricsrecordimpl.java

hadoop:Nutch集群平台

/*
 * MetricsRecordImpl.java
 *
 * Copyright 2006 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.metrics.spi;

import java.util.LinkedHashMap;
import java.util.Map;
import org.apache.hadoop.metrics.MetricsRecord;
import org.apache.hadoop.metrics.spi.AbstractMetricsContext.TagMap;

/**
 * An implementation of MetricsRecord.  Keeps a back-pointer to the context
 * from which it was created, and delegates back to it on <code>update</code>
 * and <code>remove()</code>.
 */
public class MetricsRecordImpl implements MetricsRecord {
    
    private TagMap tagTable = new TagMap();
    //private Map<String,MetricValue> metricTable = new LinkedHashMap<String,MetricValue>();
    private Map metricTable = new LinkedHashMap();
    
    private String recordName;
    private AbstractMetricsContext context;
    
    
    /** Creates a new instance of FileRecord */
    protected MetricsRecordImpl(String recordName, AbstractMetricsContext context)
    {
        this.recordName = recordName;
        this.context = context;
    }
    
    /**
     * Returns the record name. 
     *
     * @return the record name
     */
    public String getRecordName() {
        return recordName;
    }
    
    /**
     * Sets the named tag to the specified value.
     *
     * @param tagName name of the tag
     * @param tagValue new value of the tag
     * @throws MetricsException if the tagName conflicts with the configuration
     */
    public void setTag(String tagName, String tagValue) {
        tagTable.put(tagName, tagValue);
    }
    
    /**
     * Sets the named tag to the specified value.
     *
     * @param tagName name of the tag
     * @param tagValue new value of the tag
     * @throws MetricsException if the tagName conflicts with the configuration
     */
    public void setTag(String tagName, int tagValue) {
        tagTable.put(tagName, new Integer(tagValue));
    }
    
    /**
     * Sets the named tag to the specified value.
     *
     * @param tagName name of the tag
     * @param tagValue new value of the tag
     * @throws MetricsException if the tagName conflicts with the configuration
     */
    public void setTag(String tagName, short tagValue) {
        tagTable.put(tagName, new Short(tagValue));
    }
    
    /**
     * Sets the named tag to the specified value.
     *
     * @param tagName name of the tag
     * @param tagValue new value of the tag
     * @throws MetricsException if the tagName conflicts with the configuration
     */
    public void setTag(String tagName, byte tagValue) {
        tagTable.put(tagName, new Byte(tagValue));
    }
    
    /**
     * Sets the named metric to the specified value.
     *
     * @param metricName name of the metric
     * @param metricValue new value of the metric
     * @throws MetricsException if the metricName or the type of the metricValue 
     * conflicts with the configuration
     */
    public void setMetric(String metricName, int metricValue) {
        setAbsolute(metricName, new Integer(metricValue));
    }
    
    /**
     * Sets the named metric to the specified value.
     *
     * @param metricName name of the metric
     * @param metricValue new value of the metric
     * @throws MetricsException if the metricName or the type of the metricValue 
     * conflicts with the configuration
     */
    public void setMetric(String metricName, short metricValue) {
        setAbsolute(metricName, new Short(metricValue));
    }
    
    /**
     * Sets the named metric to the specified value.
     *
     * @param metricName name of the metric
     * @param metricValue new value of the metric
     * @throws MetricsException if the metricName or the type of the metricValue 
     * conflicts with the configuration
     */
    public void setMetric(String metricName, byte metricValue) {
        setAbsolute(metricName, new Byte(metricValue));
    }
    
    /**
     * Sets the named metric to the specified value.
     *
     * @param metricName name of the metric
     * @param metricValue new value of the metric
     * @throws MetricsException if the metricName or the type of the metricValue 
     * conflicts with the configuration
     */
    public void setMetric(String metricName, float metricValue) {
        setAbsolute(metricName, new Float(metricValue));
    }
    
    /**
     * Increments the named metric by the specified value.
     *
     * @param metricName name of the metric
     * @param metricValue incremental value
     * @throws MetricsException if the metricName or the type of the metricValue 
     * conflicts with the configuration
     */
    public void incrMetric(String metricName, int metricValue) {
        setIncrement(metricName, new Integer(metricValue));
    }
    
    /**
     * Increments the named metric by the specified value.
     *
     * @param metricName name of the metric
     * @param metricValue incremental value
     * @throws MetricsException if the metricName or the type of the metricValue 
     * conflicts with the configuration
     */
    public void incrMetric(String metricName, short metricValue) {
        setIncrement(metricName, new Short(metricValue));
    }
    
    /**
     * Increments the named metric by the specified value.
     *
     * @param metricName name of the metric
     * @param metricValue incremental value
     * @throws MetricsException if the metricName or the type of the metricValue 
     * conflicts with the configuration
     */
    public void incrMetric(String metricName, byte metricValue) {
        setIncrement(metricName, new Byte(metricValue));
    }
    
    /**
     * Increments the named metric by the specified value.
     *
     * @param metricName name of the metric
     * @param metricValue incremental value
     * @throws MetricsException if the metricName or the type of the metricValue 
     * conflicts with the configuration
     */
    public void incrMetric(String metricName, float metricValue) {
        setIncrement(metricName, new Float(metricValue));
    }
    
    private void setAbsolute(String metricName, Number metricValue) {
        metricTable.put(metricName, new MetricValue(metricValue, MetricValue.ABSOLUTE));
    }
    
    private void setIncrement(String metricName, Number metricValue) {
        metricTable.put(metricName, new MetricValue(metricValue, MetricValue.INCREMENT));
    }
    
    /**
     * Updates the table of buffered data which is to be sent periodically.
     * If the tag values match an existing row, that row is updated; 
     * otherwise, a new row is added.
     */
    public void update() {
        context.update(this);
    }
    
    /**
     * Removes the row, if it exists, in the buffered data table having tags 
     * that equal the tags that have been set on this record. 
     */
    public void remove() {
        context.remove(this);
    }

    TagMap getTagTable() {
        return tagTable;
    }

    //Map<String, MetricValue> getMetricTable() {
    Map getMetricTable() {
        return metricTable;
    }
}