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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.management.internal.beans;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

import com.gemstone.gemfire.distributed.internal.locks.DLockService;
import com.gemstone.gemfire.distributed.internal.locks.DLockToken;
import com.gemstone.gemfire.management.internal.ManagementConstants;

/**
 * This class acts as a Bridge between JMX layer and GemFire layer
 * 
 * @author rishim
 * 
 */
public class LockServiceMBeanBridge {

  private DLockService lockService;

  public LockServiceMBeanBridge(DLockService lockService) {
    this.lockService = lockService;

  }

  /** Operations **/
  public void becomeLockGrantor() {
    lockService.becomeLockGrantor();

  }

  /**
   * 
   * @return currently held lock by this lock Service
   */

  public String[] listHeldLocks() {
    Map tokenMap = lockService.snapshotService();
    Iterator it = tokenMap.keySet().iterator();
    List listOfLocks = new ArrayList();
    int j = 0;
    while (it.hasNext()) {
      Object lockObject = it.next();
      DLockToken token = tokenMap.get(lockObject);
      if (token.getUsageCount() > 0) {
        // As lock objects are of Object type, this is the best
        // info we can give
        listOfLocks.add(lockObject.toString());
      }
    }
    if (listOfLocks.size() > 0) {
      String[] retStr = new String[listOfLocks.size()];
      listOfLocks.toArray(retStr);
      return retStr;
    }

    return ManagementConstants.NO_DATA_STRING;
  }

  /** Config Data **/

  public boolean isDistributed() {
    return lockService.isDistributed();
  }

  public boolean isLockGrantor() {
    return lockService.isLockGrantor();
  }

  public String fetchGrantorMember() {
    return lockService.peekLockGrantorId() != null ? lockService
        .peekLockGrantorId().getLockGrantorMember().getId() : null;
  }

  public int getMemberCount() {
    return 0;
  }

  public String[] getMemberNames() {
    return ManagementConstants.NO_DATA_STRING;
  }

  public String getName() {
    return lockService.getName();
  }

  /**
   * Returns a list of thread which are blocked on some Object
   * 
   * @return map of object Name and thread holding lock on that object
   */
  public Map listThreadsHoldingLock() {

    Map tokenMap = lockService.snapshotService();
    Iterator it = tokenMap.keySet().iterator();
    Map listOfLocks = new HashMap();
    int j = 0;
    while (it.hasNext()) {
      Object lockObject = it.next();
      DLockToken token = tokenMap.get(lockObject);
      if (token.getUsageCount() > 0) {
        listOfLocks.put(lockObject.toString(), token.getThreadName());
      }
    }

    return listOfLocks;

  }

  
} 















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