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/*
 * Copyright (c) 2010-2015 Pivotal Software, Inc. All rights reserved.
 *
 * 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. See accompanying
 * LICENSE file.
 */
package com.gemstone.gemfire.internal.size;

import java.lang.instrument.Instrumentation;


public class InstrumentationSingleObjectSizer implements SingleObjectSizer {
  
  private static Instrumentation instrumentation;
  
  public static void premain(String agentArgs, Instrumentation instrumentation) {
    InstrumentationSingleObjectSizer.instrumentation = instrumentation;
  }
  
  public InstrumentationSingleObjectSizer() {
    if(instrumentation == null) {
      throw new RuntimeException("SizeOfUtil50 must be used as an instrumentation agent by specifying -javaagent:/path/to/sizeagent.jar to java on the command line");
    }
    
  }

  public long sizeof(Object object) {
    return instrumentation.getObjectSize(object);
  }

  public boolean isAgentAttached() {
    return true;
  }
}