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/*
* Copyright (c) 2011, 2012, 2015, 2016, 2020 Eike Stepper (Loehne, 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.common.lock;
import org.eclipse.emf.cdo.common.CDOCommonSession;
import org.eclipse.emf.cdo.common.CDOCommonView;
import org.eclipse.emf.cdo.common.branch.CDOBranch;
import org.eclipse.emf.cdo.common.branch.CDOBranchPoint;
import org.eclipse.emf.cdo.common.id.CDOID;
import org.eclipse.emf.cdo.common.lock.CDOLockChangeInfo.Operation;
import org.eclipse.emf.cdo.common.lock.IDurableLockingManager.LockArea;
import org.eclipse.emf.cdo.common.lock.IDurableLockingManager.LockGrade;
import org.eclipse.emf.cdo.common.revision.CDOIDAndBranch;
import org.eclipse.emf.cdo.internal.common.lock.CDOLockAreaImpl;
import org.eclipse.emf.cdo.internal.common.lock.CDOLockChangeInfoImpl;
import org.eclipse.emf.cdo.internal.common.lock.CDOLockOwnerImpl;
import org.eclipse.emf.cdo.internal.common.lock.CDOLockStateImpl;
import org.eclipse.emf.cdo.spi.common.lock.InternalCDOLockState;
import org.eclipse.net4j.util.CheckUtil;
import org.eclipse.net4j.util.HexUtil;
import org.eclipse.net4j.util.concurrent.IRWLockManager.LockType;
import org.eclipse.net4j.util.concurrent.RWOLockManager.LockState;
import java.util.Map;
import java.util.Random;
/**
* Various static methods that may help with classes related to CDO locks.
*
* @author Caspar De Groot
* @since 4.1
*/
public final class CDOLockUtil
{
private static final int DURABLE_SESSION_ID = 0;
private static final int DURABLE_VIEW_ID = 0;
private CDOLockUtil()
{
}
/**
* @since 4.12
*/
public static CDOID getLockedObjectID(Object lockedObject)
{
if (lockedObject instanceof CDOID)
{
return (CDOID)lockedObject;
}
if (lockedObject instanceof CDOIDAndBranch)
{
return ((CDOIDAndBranch)lockedObject).getID();
}
return null;
}
/**
* @since 4.12
*/
public static CDOBranch getLockedObjectBranch(Object lockedObject)
{
if (lockedObject instanceof CDOIDAndBranch)
{
return ((CDOIDAndBranch)lockedObject).getBranch();
}
return null;
}
public static CDOLockState copyLockState(CDOLockState lockState)
{
return copyLockState(lockState, lockState.getLockedObject());
}
/**
* @since 4.12
*/
public static CDOLockState copyLockState(CDOLockState lockState, Object lockedObject)
{
CheckUtil.checkArg(lockState instanceof CDOLockStateImpl, "lockState instanceof CDOLockStateImpl");
return ((CDOLockStateImpl)lockState).copy(lockedObject);
}
public static CDOLockState createLockState(Object target)
{
return new CDOLockStateImpl(target);
}
public static CDOLockState createLockState(LockState<Object, ? extends CDOCommonView> lockState)
{
CheckUtil.checkArg(lockState, "lockState");
InternalCDOLockState cdoLockState = new CDOLockStateImpl(lockState.getLockedObject());
for (CDOCommonView view : lockState.getReadLockOwners())
{
String durableLockingID = view.getDurableLockingID();
int sessionID, viewID;
CDOCommonSession session = view.getSession();
boolean isDurableView = session == null;
if (isDurableView)
{
sessionID = DURABLE_SESSION_ID;
viewID = DURABLE_VIEW_ID;
}
else
{
sessionID = session.getSessionID();
viewID = view.getViewID();
}
CDOLockOwner owner = new CDOLockOwnerImpl(sessionID, viewID, durableLockingID, isDurableView);
cdoLockState.addReadLockOwner(owner);
}
CDOCommonView writeLockOwner = lockState.getWriteLockOwner();
if (writeLockOwner != null)
{
CDOLockOwner owner = createLockOwner(writeLockOwner);
cdoLockState.setWriteLockOwner(owner);
}
CDOCommonView writeOptionOwner = lockState.getWriteOptionOwner();
if (writeOptionOwner != null)
{
CDOLockOwner owner = createLockOwner(writeOptionOwner);
cdoLockState.setWriteOptionOwner(owner);
}
return cdoLockState;
}
public static CDOLockOwner createLockOwner(CDOCommonView view)
{
String durableLockingID = view.getDurableLockingID();
CDOCommonSession session = view.getSession();
if (session != null)
{
int sessionID = session.getSessionID();
int viewID = view.getViewID();
return new CDOLockOwnerImpl(sessionID, viewID, durableLockingID, false);
}
CheckUtil.checkNull(durableLockingID, "durableLockingID");
return new CDOLockOwnerImpl(DURABLE_SESSION_ID, DURABLE_VIEW_ID, durableLockingID, true);
}
public static CDOLockChangeInfo createLockChangeInfo(long timestamp, CDOLockOwner lockOwner, CDOBranch branch, Operation op, LockType lockType,
CDOLockState[] cdoLockStates)
{
return new CDOLockChangeInfoImpl(branch.getPoint(timestamp), lockOwner, cdoLockStates, op, lockType);
}
public static CDOLockChangeInfo createLockChangeInfo()
{
return new CDOLockChangeInfoImpl();
}
public static CDOLockChangeInfo createLockChangeInfo(long timestamp, CDOCommonView view, CDOBranch viewedBranch, Operation op, LockType lockType,
CDOLockState[] cdoLockStates)
{
CDOLockOwner lockOwner = createLockOwner(view);
return createLockChangeInfo(timestamp, lockOwner, viewedBranch, op, lockType, cdoLockStates);
}
public static LockArea createLockArea(String durableLockingID, String userID, CDOBranchPoint branchPoint, boolean readOnly, Map<CDOID, LockGrade> locks)
{
return new CDOLockAreaImpl(durableLockingID, userID, branchPoint, readOnly, locks);
}
public static LockArea createLockArea(String durableLockingID)
{
return new CDOLockAreaImpl(durableLockingID);
}
public static String createDurableLockingID()
{
return createDurableLockingID(LockArea.DEFAULT_DURABLE_LOCKING_ID_BYTES);
}
public static String createDurableLockingID(int bytes)
{
byte[] buffer = new byte[bytes];
Random random = new Random(System.currentTimeMillis());
random.nextBytes(buffer);
return HexUtil.bytesToHex(buffer);
}
}
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