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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.admin.remote;

import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;

import com.gemstone.gemfire.CancelException;
import com.gemstone.gemfire.cache.persistence.PersistentID;
import com.gemstone.gemfire.distributed.DistributedMember;
import com.gemstone.gemfire.distributed.internal.DM;
import com.gemstone.gemfire.distributed.internal.DistributionManager;
import com.gemstone.gemfire.distributed.internal.DistributionMessage;
import com.gemstone.gemfire.distributed.internal.ReplyException;
import com.gemstone.gemfire.internal.cache.DiskStoreImpl;
import com.gemstone.gemfire.internal.cache.GemFireCacheImpl;
import com.gemstone.gemfire.internal.util.ArrayUtils;

/**
 * An instruction to all members with cache that they should 
 * compact their disk stores.
 * @author dsmith
 *
 */
public class CompactRequest extends AdminRequest {
  public CompactRequest() {
  }
  
  public static Map> send(DM dm) {
    Set recipients = dm.getOtherDistributionManagerIds();
    CompactRequest request = new CompactRequest();
    request.setRecipients(recipients);
    
    CompactReplyProcessor replyProcessor = new CompactReplyProcessor(dm, recipients);
    request.msgId = replyProcessor.getProcessorId();
    dm.putOutgoing(request);
    
    request.setSender(dm.getDistributionManagerId());
    request.process((DistributionManager)dm);
    
    try {
      replyProcessor.waitForReplies();
    } catch (ReplyException e) {
      if(!(e.getCause() instanceof CancelException)) {
        e.handleAsUnexpected();
      }
    } catch (InterruptedException e) {
      e.printStackTrace();
    }
    
    return replyProcessor.results;
  }
  
  @Override
  protected void process(DistributionManager dm) {
    super.process(dm);
  }

  @Override
  protected AdminResponse createResponse(DistributionManager dm) {
    GemFireCacheImpl cache = GemFireCacheImpl.getInstance();
    HashSet compactedStores = new HashSet();
    if(cache != null && !cache.isClosed()) {
      for(DiskStoreImpl store : cache.listDiskStoresIncludingRegionOwned()) {
        if(store.forceCompaction()) {
          compactedStores.add(store.getPersistentID());
        }
      }
    }

    return new CompactResponse(this.getSender(), compactedStores);
  }

  public int getDSFID() {
    return COMPACT_REQUEST;
  }
  
  @Override
  public void fromData(DataInput in) throws IOException,ClassNotFoundException {
    super.fromData(in);
  }

  @Override
  public void toData(DataOutput out) throws IOException {
    super.toData(out);
  }

  @Override  
  public String toString() {
    return "Compact request sent to " + ArrayUtils.toString((Object[])this.getRecipients()) +
      " from " + this.getSender();
  }

  private static class CompactReplyProcessor extends AdminMultipleReplyProcessor {
    Map> results = Collections.synchronizedMap(new HashMap>());
    
    public CompactReplyProcessor(DM dm, Collection initMembers) {
      super(dm, initMembers);
    }
    
    @Override
    protected boolean stopBecauseOfExceptions() {
      return false;
    }

    @Override
    protected boolean allowReplyFromSender() {
      return true;
    }

    @Override
    protected void process(DistributionMessage msg, boolean warn) {
      if(msg instanceof CompactResponse) {
        final HashSet persistentIds = ((CompactResponse) msg).getPersistentIds();
        if(persistentIds != null && !persistentIds.isEmpty()) {
          results.put(msg.getSender(), persistentIds);
        }
      }
      super.process(msg, warn);
    }
    
    
  }
}