code: /**
   * Copyright 2017 Alexey Ragozin
   *
   * 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.gridkit.jvmtool.gcmon;
  
  import org.gridkit.jvmtool.event.SimpleCounterCollection;
  import org.gridkit.jvmtool.event.SimpleTagCollection;
  
  public class MemoryInfoEventPojo implements MemoryPoolInfoEvent {
  
      private long timestamp;
  
      private SimpleTagCollection tags = new SimpleTagCollection();
      private SimpleCounterCollection counters = new SimpleCounterCollection();
  
      @Override
      public long timestamp() {
          return timestamp;
      }
  
      public void timestamp(long timestamp) {
          this.timestamp = timestamp;
      }
  
      @Override
      public SimpleCounterCollection counters() {
          return counters;
      }
  
      @Override
      public SimpleTagCollection tags() {
          return tags;
      }
  
      @Override
      public String name() {
          return tags.firstTagFor(MEM_POOL_NAME);
      }
  
      public void name(String value) {
          tags.put(MEM_POOL_NAME, value);
      }
  
      @Override
      public boolean nonHeap() {
          return tags.firstTagFor(MEM_POOL_NON_HEAP) != null;
      }
  
      public void nonHeap(boolean nonHeap) {
          if (nonHeap) {
              tags.put(MEM_POOL_NON_HEAP, "");
          }
      }
  
      @Override
      public Iterable<String> memoryManagers() {
          return tags.tagsFor(MEM_POOL_MEMORY_MANAGER);
      }
  
      @Override
      public MemoryUsageBean peakUsage() {
          return readMemUsage(MEM_POOL_MEMORY_PEAK);
      }
  
      public void peakUsage(MemoryUsageBean usage) {
          storeMemUsage(MEM_POOL_MEMORY_PEAK, usage);
      }
  
      @Override
      public MemoryUsageBean currentUsage() {
          return readMemUsage(MEM_POOL_MEMORY_USAGE);
      }
  
      public void currentUsage(MemoryUsageBean usage) {
          storeMemUsage(MEM_POOL_MEMORY_USAGE, usage);
      }
  
      @Override
      public MemoryUsageBean collectionUsage() {
          return readMemUsage(MEM_POOL_COLLECTION_USAGE);
      }
  
      public void collectionUsage(MemoryUsageBean usage) {
          storeMemUsage(MEM_POOL_COLLECTION_USAGE, usage);
      }
  
      private MemoryUsageBean readMemUsage(String name) {
          if (counters.getValue(name + "." + MEM_USAGE_INIT) >= 0) {
              return new MemoryUsageBean(
                      counters.getValue(name + "." + MEM_USAGE_INIT),
                      counters.getValue(name + "." + MEM_USAGE_USED),
                      counters.getValue(name + "." + MEM_USAGE_COMMITTED),
                      counters.getValue(name + "." + MEM_USAGE_MAX));
          }
          else {
              return null;
          }
      }
  
      private void storeMemUsage(String name, MemoryUsageBean bean) {
          counters.set(name + "." + MEM_USAGE_INIT, bean.init());
          counters.set(name + "." + MEM_USAGE_USED, bean.used());
          counters.set(name + "." + MEM_USAGE_COMMITTED, bean.committed());
          counters.set(name + "." + MEM_USAGE_MAX, bean.max());
      }
  }
  