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/*
 * Copyright (c) 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016 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
 *  or .
 * 
 * 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> 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;
  }
}