/*
* Copyright (c) 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017 David Berkman
*
* This file is part of the SmallMind Code Project.
*
* The SmallMind Code Project is free software, you can redistribute
* it and/or modify it under either, at your discretion...
*
* 1) The terms of GNU Affero General Public License as published by the
* Free Software Foundation, either version 3 of the License, or (at
* your option) any later version.
*
* ...or...
*
* 2) The terms of the Apache License, Version 2.0.
*
* The SmallMind Code Project is distributed in the hope that it will
* be useful, but WITHOUT ANY WARRANTY; without even the implied warranty
* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License or Apache License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* and the Apache License along with the SmallMind Code Project. If not, see
* <http://www.gnu.org/licenses/> or <http://www.apache.org/licenses/LICENSE-2.0>.
*
* Additional permission under the GNU Affero GPL version 3 section 7
* ------------------------------------------------------------------
* If you modify this Program, or any covered work, by linking or
* combining it with other code, such other code is not for that reason
* alone subject to any of the requirements of the GNU Affero GPL
* version 3.
*/
package org.smallmind.instrument.context;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
import org.smallmind.instrument.InstrumentationManager;
import org.smallmind.instrument.Metric;
import org.smallmind.instrument.MetricProperty;
import org.smallmind.instrument.event.MetricEvent;
public abstract class NamedMetric<M extends Metric<M>> implements InvocationHandler {
private M metric;
private M proxyMetric;
private MetricAddress metricAddress;
public NamedMetric (M metric, String domain, MetricProperty... properties) {
this.metric = metric;
metricAddress = new MetricAddress(domain, properties);
proxyMetric = metric.getMetricClass().cast(Proxy.newProxyInstance(NamedMetric.class.getClassLoader(), new Class[]{metric.getMetricClass()}, this));
}
public abstract Method[] getUpdatingMethods ();
public M getProxy () {
return proxyMetric;
}
@Override
public Object invoke (Object proxy, Method method, Object[] args)
throws Throwable {
MetricContext metricContext = InstrumentationManager.getMetricContext();
Object result;
if (metricContext != null) {
metricContext.pushSnapshot(metricAddress);
}
try {
result = method.invoke(metric, args);
for (Method updatingMethod : getUpdatingMethods()) {
if (method.equals(updatingMethod)) {
InstrumentationManager.getMetricRegistry().fireMetricEvent(new MetricEvent(metric, metricAddress, method, args));
break;
}
}
} finally {
if (metricContext != null) {
metricContext.popSnapshot();
}
}
return result;
}
}