/*
 * 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.skywalking.apm.agent.core.jvm.gc;

import java.lang.management.GarbageCollectorMXBean;
import java.util.LinkedList;
import java.util.List;
import org.apache.skywalking.apm.network.proto.GC;
import org.apache.skywalking.apm.network.proto.GCPhrase;

/**
 * @author wusheng
 */
public abstract class GCModule implements GCMetricAccessor {
    private List<GarbageCollectorMXBean> beans;

    private long lastGCCount = 0;
    private long lastCollectionTime = 0;

    public GCModule(List<GarbageCollectorMXBean> beans) {
        this.beans = beans;
    }

    @Override
    public List<GC> getGCList() {
        List<GC> gcList = new LinkedList<GC>();
        for (GarbageCollectorMXBean bean : beans) {
            String name = bean.getName();
            GCPhrase phrase;
            if (name.equals(getNewGCName())) {
                phrase = GCPhrase.NEW;
            } else if (name.equals(getOldGCName())) {
                phrase = GCPhrase.OLD;
            } else {
                continue;
            }

            long collectionCount = bean.getCollectionCount();
            long gcCount = collectionCount - lastGCCount;
            lastGCCount = collectionCount;

            long time = bean.getCollectionTime();
            long gcTime = time - lastCollectionTime;
            lastCollectionTime = time;

            gcList.add(
                GC.newBuilder().setPhrase(phrase)
                    .setCount(gcCount)
                    .setTime(gcTime)
                    .build()
            );
        }

        return gcList;
    }

    protected abstract String getOldGCName();

    protected abstract String getNewGCName();
}

@@ -1220,24 +1220,25 @@
 te long last
+O
 GCCount = 0;
@@ -1255,24 +1255,106 @@
 te long last
+YGCCount = 0;%0A    private long lastOGCCollectionTime = 0;%0A    private long lastYGC
 CollectionTi
@@ -1674,16 +1674,75 @@
 phrase;%0A
+            long gcCount = 0;%0A            long gcTime = 0;%0A
         
@@ -1827,24 +1827,352 @@
             
+    long collectionCount = bean.getCollectionCount();%0A                gcCount = collectionCount - lastYGCCount;%0A                lastYGCCount = collectionCount;%0A%0A                long time = bean.getCollectionTime();%0A                gcTime = time - lastYGCCollectionTime;%0A                lastYGCCollectionTime = time;%0A            
 %7D else if (n
@@ -2248,66 +2248,8 @@
     
-        %7D else %7B%0A                continue;%0A            %7D%0A%0A
     
@@ -2310,36 +2310,35 @@
 ();%0A            
-long
+   
  gcCount = colle
@@ -2350,24 +2350,25 @@
 Count - last
+O
 GCCount;%0A   
@@ -2376,20 +2376,25 @@
         
+   
+ 
 last
+O
 GCCount 
@@ -2405,32 +2405,36 @@
 llectionCount;%0A%0A
+    
             long
@@ -2471,36 +2471,35 @@
 ();%0A            
-long
+   
  gcTime = time -
@@ -2499,24 +2499,27 @@
  time - last
+OGC
 CollectionTi
@@ -2534,20 +2534,27 @@
         
+    
 last
+OGC
 Collecti
@@ -2567,16 +2567,77 @@
  = time;
+%0A            %7D else %7B%0A                continue;%0A            %7D
 %0A%0A      

Fix the GC value is incorrect (#1147)