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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.cache.persistence.soplog;

import java.io.File;
import java.io.IOException;
import java.util.ArrayDeque;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Deque;
import java.util.SortedMap;
import java.util.TreeMap;
import java.util.concurrent.atomic.AtomicLong;

import com.gemstone.gemfire.internal.cache.persistence.soplog.SortedOplog.SortedOplogReader;

/**
 * Provides a compactor that does no compaction, primarily for testing purposes.
 *  
 * @author bakera
 */
public class NonCompactor implements Compactor {
  /** the fileset */
  private final Fileset fileset;
  
  /** the current readers */
  private final Deque> readers;
  
  public static Fileset createFileset(final String name, final File dir) {
    return new Fileset() {
      private final AtomicLong file = new AtomicLong(0);
      
      @Override
      public SortedMap> recover() {
        return new TreeMap>();
      }

      @Override
      public File getNextFilename() {
        return new File(dir, name + "-" + System.currentTimeMillis() + "-" 
            + file.getAndIncrement() + ".soplog");
      }
    };
  }
  public NonCompactor(String name, File dir) {
    fileset = createFileset(name, dir);
    readers = new ArrayDeque>();
  }
  
  @Override
  public boolean compact() throws IOException {
    // liar!
    return true;
  }

  @Override
  public void compact(boolean force, CompactionHandler cd) {
  }

  @Override
  public synchronized Collection> getActiveReaders(
      byte[] start, byte[] end) {
    for (TrackedReference tr : readers) {
      tr.increment();
    }
    return new ArrayList>(readers);
  }

  @Override
  public void add(SortedOplog soplog) throws IOException {
    readers.addFirst(new TrackedReference(soplog.createReader()));
  }

  @Override
  public synchronized void clear() throws IOException {
    for (TrackedReference tr : readers) {
      tr.get().close();
      readers.remove(tr);
    }
  }

  @Override
  public synchronized void close() throws IOException {
    clear();
  }

  @Override
  public CompactionTracker getTracker() {
    return null;
  }
  
  @Override
  public Fileset getFileset() {
    return fileset;
  }
}