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/*
 * Copyright (c) 2016 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
 */
package org.eclipse.emf.cdo.server.internal.net4j.protocol;

import org.eclipse.emf.cdo.common.id.CDOID;
import org.eclipse.emf.cdo.common.protocol.CDODataInput;
import org.eclipse.emf.cdo.common.protocol.CDODataOutput;
import org.eclipse.emf.cdo.common.protocol.CDOProtocolConstants;
import org.eclipse.emf.cdo.common.revision.CDORevision;
import org.eclipse.emf.cdo.common.revision.CDORevisionHandler;
import org.eclipse.emf.cdo.server.IUnitManager;
import org.eclipse.emf.cdo.spi.server.InternalView;

import org.eclipse.net4j.util.om.monitor.OMMonitor;

import java.io.IOException;

/**
 * @author Eike Stepper
 */
public class UnitIndication extends CDOServerReadIndicationWithMonitoring
{
  private int viewID;

  private CDOID rootID;

  private byte opcode;

  public UnitIndication(CDOServerProtocol protocol)
  {
    super(protocol, CDOProtocolConstants.SIGNAL_UNIT);
  }

  @Override
  protected void indicating(CDODataInput in, OMMonitor monitor) throws Exception
  {
    viewID = in.readInt();
    rootID = in.readCDOID();
    opcode = in.readByte();
  }

  @Override
  protected void responding(final CDODataOutput out, OMMonitor monitor) throws Exception
  {
    if (opcode == CDOProtocolConstants.UNIT_CHECK)
    {
      IUnitManager unitManager = getRepository().getUnitManager();
      out.writeBoolean(unitManager.isUnit(rootID));
      return;
    }

    final IOException[] ioException = { null };
    final RuntimeException[] runtimeException = { null };
    InternalView view = getView(viewID);

    boolean success = view.openUnit(rootID, opcode == CDOProtocolConstants.UNIT_CREATE, new CDORevisionHandler()
    {
      public boolean handleRevision(CDORevision revision)
      {
        try
        {
          out.writeCDORevision(revision, CDORevision.UNCHUNKED); // Exposes revision to client side
          return true;
        }
        catch (IOException ex)
        {
          ioException[0] = ex;
        }
        catch (RuntimeException ex)
        {
          runtimeException[0] = ex;
        }

        return false;
      }
    }, monitor);

    if (ioException[0] != null)
    {
      throw ioException[0];
    }

    if (runtimeException[0] != null)
    {
      throw runtimeException[0];
    }

    out.writeCDORevision(null, CDORevision.UNCHUNKED); // No more revisions
    out.writeBoolean(success);

    int xxx;
    System.out.println("--> DONE");
  }
}