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/**
* 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:
* Eike Stepper - initial API and implementation
*/
package org.eclipse.emf.cdo.common.lock;
import org.eclipse.emf.cdo.common.branch.CDOBranchPoint;
import org.eclipse.emf.cdo.common.id.CDOID;
import org.eclipse.net4j.util.concurrent.IRWLockManager.LockType;
import java.util.Map;
/**
* @author Eike Stepper
* @since 4.0
* @noextend This interface is not intended to be extended by clients.
* @noimplement This interface is not intended to be implemented by clients.
*/
public interface IDurableLockingManager
{
public LockArea createLockArea(String userID, CDOBranchPoint branchPoint, boolean readOnly,
Map<CDOID, LockGrade> locks);
/**
* Returns the {@link LockArea lock area} specified by the given durableLockingID, never <code>null</code>.
*
* @throws LockAreaNotFoundException
* if the given durableLockingID is unknown.
*/
public LockArea getLockArea(String durableLockingID) throws LockAreaNotFoundException;
public void getLockAreas(String userIDPrefix, LockArea.Handler handler);
public void deleteLockArea(String durableLockingID);
/**
* @author Eike Stepper
* @noextend This interface is not intended to be extended by clients.
* @noimplement This interface is not intended to be implemented by clients.
*/
public interface LockArea extends CDOBranchPoint
{
public String getDurableLockingID();
public String getUserID();
public boolean isReadOnly();
public Map<CDOID, LockGrade> getLocks();
/**
* @author Eike Stepper
*/
public interface Handler
{
public boolean handleLockArea(LockArea area);
}
}
/**
* @author Eike Stepper
*/
public static class LockAreaNotFoundException extends IllegalStateException
{
private static final long serialVersionUID = 1L;
private String durableLockingID;
public LockAreaNotFoundException(String durableLockingID)
{
super("No lock area for ID=" + durableLockingID);
this.durableLockingID = durableLockingID;
}
public LockAreaNotFoundException(String message, Throwable cause, String durableLockingID)
{
super(message, cause);
this.durableLockingID = durableLockingID;
}
public String getDurableLockingID()
{
return durableLockingID;
}
}
/**
* @author Eike Stepper
* @noextend This interface is not intended to be extended by clients.
*/
public enum LockGrade
{
NONE(0), READ(1), WRITE(2), READ_WRITE(READ.getValue() | WRITE.getValue());
private final int value;
private LockGrade(int value)
{
this.value = value;
}
public int getValue()
{
return value;
}
public boolean isRead()
{
return (value & 1) != 0;
}
public boolean isWrite()
{
return (value & 2) != 0;
}
public LockGrade getUpdated(LockType type, boolean on)
{
int mask = type == LockType.READ ? 1 : 2;
if (on)
{
return get(value | mask);
}
return get(value & ~mask);
}
public static LockGrade get(LockType type)
{
if (type == LockType.READ)
{
return READ;
}
if (type == LockType.WRITE)
{
return WRITE;
}
return NONE;
}
public static LockGrade get(boolean read, boolean write)
{
return get((read ? 1 : 0) | (write ? 2 : 0));
}
public static LockGrade get(int value)
{
switch (value)
{
case 0:
return NONE;
case 1:
return READ;
case 2:
return WRITE;
case 3:
return READ_WRITE;
default:
throw new IllegalArgumentException("Invalid lock grade: " + value);
}
}
}
}
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