1 files changed, 94 insertions, 0 deletions
diff --git a/plugins/org.eclipse.emf.cdo.server.net4j/src/org/eclipse/emf/cdo/server/internal/net4j/protocol/LockDelegationIndication.java b/plugins/org.eclipse.emf.cdo.server.net4j/src/org/eclipse/emf/cdo/server/internal/net4j/protocol/LockDelegationIndication.java
new file mode 100644
index 0000000000..eaa67fd485
--- /dev/null
+++ b/plugins/org.eclipse.emf.cdo.server.net4j/src/org/eclipse/emf/cdo/server/internal/net4j/protocol/LockDelegationIndication.java
@@ -0,0 +1,94 @@
+/**
+ * Copyright (c) 2004 - 2011 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:
+ *    Caspar De Groot - initial API and implementation
+ */
+package org.eclipse.emf.cdo.server.internal.net4j.protocol;
+
+import org.eclipse.emf.cdo.common.branch.CDOBranch;
+import org.eclipse.emf.cdo.common.lock.IDurableLockingManager.LockArea;
+import org.eclipse.emf.cdo.common.lock.IDurableLockingManager.LockAreaNotFoundException;
+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.server.IView;
+import org.eclipse.emf.cdo.spi.server.InternalLockManager;
+import org.eclipse.emf.cdo.spi.server.InternalSession;
+import org.eclipse.emf.cdo.spi.server.InternalView;
+
+import org.eclipse.net4j.util.CheckUtil;
+
+import java.io.IOException;
+
+/**
+ * @author Caspar De Groot
+ */
+public class LockDelegationIndication extends LockObjectsIndication
+{
+  private InternalView view;
+
+  private String lockAreaID;
+
+  public LockDelegationIndication(CDOServerProtocol protocol)
+  {
+    super(protocol, CDOProtocolConstants.SIGNAL_LOCK_DELEGATION);
+  }
+
+  @Override
+  protected void indicating(CDODataInput in) throws IOException
+  {
+    lockAreaID = in.readString();
+    super.indicating(in);
+  }
+
+  @Override
+  protected void responding(CDODataOutput out) throws IOException
+  {
+    try
+    {
+      super.responding(out);
+    }
+    finally
+    {
+      view.close();
+    }
+  }
+
+  @Override
+  protected IView getView(int viewID, CDOBranch viewedBranch)
+  {
+    // The view needs a lockArea...
+    InternalLockManager lockManager = getRepository().getLockManager();
+    InternalSession session = getSession();
+    LockArea lockArea;
+
+    try
+    {
+      lockArea = lockManager.getLockArea(lockAreaID);
+
+      // If we get here, the lockArea already exists.
+      view = (InternalView)lockManager.openView(session, InternalSession.TEMP_VIEW_ID, true, lockAreaID);
+    }
+    catch (LockAreaNotFoundException e)
+    {
+      // If we get here, the lockArea does not yet exist on the master, so we open
+      // a view without a lockArea first, then create a lockArea with the given ID,
+      // and associate it with the view.
+      view = session.openView(InternalSession.TEMP_VIEW_ID, viewedBranch.getHead());
+      lockArea = lockManager.createLockArea(view, lockAreaID);
+      view.setDurableLockingID(lockAreaID);
+    }
+
+    // The viewID received as an argument, is the ID of the client's view, which
+    // does not exist on the master. So we ignore this argument and open a new
+    // view instead.
+    CheckUtil.checkState(lockAreaID.equals(lockArea.getDurableLockingID()), "lockAreaID has incorrect value");
+
+    return view;
+  }
+}