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/*
 * Copyright (c) 2004 - 2012 Eike Stepper (Berlin, Germany) and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *    Eike Stepper - initial API and implementation
 *    Simon McDuff - bug 201266
 *    Simon McDuff - bug 230832
 */
package org.eclipse.emf.cdo.internal.common.revision;

import org.eclipse.emf.cdo.common.branch.CDOBranch;
import org.eclipse.emf.cdo.common.id.CDOID;
import org.eclipse.emf.cdo.common.revision.CDORevision;
import org.eclipse.emf.cdo.common.revision.CDORevisionKey;
import org.eclipse.emf.cdo.spi.common.revision.InternalCDORevision;
import org.eclipse.emf.cdo.spi.common.revision.InternalCDORevisionCache;

import org.eclipse.net4j.util.event.IListener;
import org.eclipse.net4j.util.ref.ReferenceQueueWorker;

import java.lang.ref.Reference;
import java.lang.ref.ReferenceQueue;
import java.lang.ref.SoftReference;
import java.text.MessageFormat;

/**
 * @author Eike Stepper
 */
public abstract class AbstractCDORevisionCache extends ReferenceQueueWorker<InternalCDORevision> implements
    InternalCDORevisionCache
{
  private static boolean disableGC;

  public AbstractCDORevisionCache()
  {
  }

  @Override
  protected void work(Reference<? extends InternalCDORevision> reference)
  {
    CDORevisionKey key = (CDORevisionKey)reference;

    CDOID id = key.getID();
    CDOBranch branch = key.getBranch();
    int version = key.getVersion();

    InternalCDORevision revision = (InternalCDORevision)removeRevision(id, branch.getVersion(version));
    if (revision == null)
    {
      // Use revision in eviction event
      key = revision;
    }

    IListener[] listeners = getListeners();
    if (listeners != null)
    {
      fireEvent(new EvictionEventImpl(this, key), listeners);
    }
  }

  protected Reference<InternalCDORevision> createReference(CDORevision revision)
  {
    if (disableGC)
    {
      return new CacheStrongReference((InternalCDORevision)revision);
    }

    return new CacheSoftReference((InternalCDORevision)revision, getQueue());
  }

  /**
   * @author Eike Stepper
   */
  private static final class CacheSoftReference extends SoftReference<InternalCDORevision> implements CDORevisionKey
  {
    private CDOID id;

    private CDOBranch branch;

    private int version;

    public CacheSoftReference(InternalCDORevision revision, ReferenceQueue<InternalCDORevision> queue)
    {
      super(revision, queue);
      id = revision.getID();
      branch = revision.getBranch();
      version = revision.getVersion();
    }

    public CDOID getID()
    {
      return id;
    }

    public CDOBranch getBranch()
    {
      return branch;
    }

    public int getVersion()
    {
      return version;
    }

    @Override
    public String toString()
    {
      return MessageFormat.format("{0}:{1}v{2}", getID(), getBranch().getID(), getVersion());
    }
  }

  /**
   * @author Eike Stepper
   */
  private static final class CacheStrongReference extends SoftReference<InternalCDORevision> implements CDORevisionKey
  {
    private CDOID id;

    private CDOBranch branch;

    private int version;

    public CacheStrongReference(InternalCDORevision revision)
    {
      super(revision);
      id = revision.getID();
      branch = revision.getBranch();
      version = revision.getVersion();
    }

    public CDOID getID()
    {
      return id;
    }

    public CDOBranch getBranch()
    {
      return branch;
    }

    public int getVersion()
    {
      return version;
    }

    @Override
    public String toString()
    {
      return MessageFormat.format("{0}:{1}v{2}", getID(), getBranch().getID(), getVersion());
    }
  }
}

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