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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.process;

import com.gemstone.gemfire.internal.process.ProcessUtils.InternalProcessUtils;
import com.sun.tools.attach.VirtualMachine;
import com.sun.tools.attach.VirtualMachineDescriptor;

/**
 * Implementation of the {@link ProcessUtils} SPI that uses the JDK Attach API.
 * 
 * @author Kirk Lund
 * @since 8.0
 */
final class AttachProcessUtils implements InternalProcessUtils {
  
  AttachProcessUtils() {}
  
  @Override
  public boolean isProcessAlive(final int pid) {
    for (VirtualMachineDescriptor vm : VirtualMachine.list()) {
      if (vm.id().equals(String.valueOf(pid))) {
        return true; // found the vm
      }
    }
    return false;
  }

  @Override
  public boolean killProcess(final int pid) {
    throw new UnsupportedOperationException("killProcess(int) not supported by AttachProcessUtils");
  }
}