hadoop MethodMetric 源码
haddop MethodMetric 代码
文件路径:/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/metrics2/lib/MethodMetric.java
/*
* 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.metrics2.lib;
import java.lang.reflect.Method;
import static org.apache.hadoop.util.Preconditions.*;
import org.apache.commons.lang3.StringUtils;
import org.apache.hadoop.metrics2.MetricsException;
import org.apache.hadoop.metrics2.MetricsRecordBuilder;
import org.apache.hadoop.metrics2.MetricsInfo;
import org.apache.hadoop.metrics2.annotation.Metric;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import static org.apache.hadoop.metrics2.util.Contracts.*;
/**
* Metric generated from a method, mostly used by annotation
*/
class MethodMetric extends MutableMetric {
private static final Logger LOG = LoggerFactory.getLogger(MethodMetric.class);
private final Object obj;
private final Method method;
private final MetricsInfo info;
private final MutableMetric impl;
MethodMetric(Object obj, Method method, MetricsInfo info, Metric.Type type) {
this.obj = checkNotNull(obj, "object");
this.method = checkArg(method, method.getParameterTypes().length == 0,
"Metric method should have no arguments");
this.method.setAccessible(true);
this.info = checkNotNull(info, "info");
impl = newImpl(checkNotNull(type, "metric type"));
}
private MutableMetric newImpl(Metric.Type metricType) {
Class<?> resType = method.getReturnType();
switch (metricType) {
case COUNTER:
return newCounter(resType);
case GAUGE:
return newGauge(resType);
case DEFAULT:
return resType == String.class ? newTag(resType) : newGauge(resType);
case TAG:
return newTag(resType);
default:
checkArg(metricType, false, "unsupported metric type");
return null;
}
}
MutableMetric newCounter(final Class<?> type) {
if (isInt(type) || isLong(type)) {
return new MutableMetric() {
@Override public void snapshot(MetricsRecordBuilder rb, boolean all) {
try {
Object ret = method.invoke(obj, (Object[])null);
if (isInt(type)) rb.addCounter(info, ((Integer) ret).intValue());
else rb.addCounter(info, ((Long) ret).longValue());
} catch (Exception ex) {
LOG.error("Error invoking method "+ method.getName(), ex);
}
}
};
}
throw new MetricsException("Unsupported counter type: "+ type.getName());
}
static boolean isInt(Class<?> type) {
boolean ret = type == Integer.TYPE || type == Integer.class;
return ret;
}
static boolean isLong(Class<?> type) {
return type == Long.TYPE || type == Long.class;
}
static boolean isFloat(Class<?> type) {
return type == Float.TYPE || type == Float.class;
}
static boolean isDouble(Class<?> type) {
return type == Double.TYPE || type == Double.class;
}
MutableMetric newGauge(final Class<?> t) {
if (isInt(t) || isLong(t) || isFloat(t) || isDouble(t)) {
return new MutableMetric() {
@Override public void snapshot(MetricsRecordBuilder rb, boolean all) {
try {
Object ret = method.invoke(obj, (Object[]) null);
if (isInt(t)) rb.addGauge(info, ((Integer) ret).intValue());
else if (isLong(t)) rb.addGauge(info, ((Long) ret).longValue());
else if (isFloat(t)) rb.addGauge(info, ((Float) ret).floatValue());
else rb.addGauge(info, ((Double) ret).doubleValue());
} catch (Exception ex) {
LOG.error("Error invoking method "+ method.getName(), ex);
}
}
};
}
throw new MetricsException("Unsupported gauge type: "+ t.getName());
}
MutableMetric newTag(Class<?> resType) {
if (resType == String.class) {
return new MutableMetric() {
@Override public void snapshot(MetricsRecordBuilder rb, boolean all) {
try {
Object ret = method.invoke(obj, (Object[]) null);
rb.tag(info, (String) ret);
} catch (Exception ex) {
LOG.error("Error invoking method "+ method.getName(), ex);
}
}
};
}
throw new MetricsException("Unsupported tag type: "+ resType.getName());
}
@Override public void snapshot(MetricsRecordBuilder builder, boolean all) {
impl.snapshot(builder, all);
}
static MetricsInfo metricInfo(Method method) {
return Interns.info(nameFrom(method), "Metric for "+ method.getName());
}
static String nameFrom(Method method) {
String methodName = method.getName();
if (methodName.startsWith("get")) {
return StringUtils.capitalize(methodName.substring(3));
}
return StringUtils.capitalize(methodName);
}
}
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