| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package org.apache.jackrabbit.oak.jcr.lock; |
| |
| import static com.google.common.base.Preconditions.checkNotNull; |
| |
| import javax.jcr.Node; |
| import javax.jcr.RepositoryException; |
| import javax.jcr.lock.Lock; |
| import javax.jcr.lock.LockException; |
| |
| import org.apache.jackrabbit.oak.jcr.delegate.SessionDelegate; |
| import org.apache.jackrabbit.oak.jcr.session.NodeImpl; |
| import org.apache.jackrabbit.oak.jcr.session.SessionContext; |
| import org.apache.jackrabbit.oak.jcr.delegate.NodeDelegate; |
| import org.apache.jackrabbit.oak.jcr.session.operation.NodeOperation; |
| import org.apache.jackrabbit.oak.jcr.session.operation.SessionOperation; |
| import org.jetbrains.annotations.NotNull; |
| import org.jetbrains.annotations.Nullable; |
| |
| public final class LockImpl implements Lock { |
| |
| private final SessionContext context; |
| |
| private final NodeDelegate delegate; |
| |
| public LockImpl(@NotNull SessionContext context, @NotNull NodeDelegate delegate) { |
| this.context = checkNotNull(context); |
| this.delegate = checkNotNull(delegate); |
| } |
| |
| @Override |
| public Node getNode() { |
| try { |
| return NodeImpl.createNode(delegate, context); |
| } catch (RepositoryException e) { |
| throw new RuntimeException("Unable to access the lock node", e); |
| } |
| } |
| |
| @Override |
| public String getLockOwner() { |
| return savePerformNullable(new NodeOperation<String>(delegate, "getLockOwner") { |
| @Override |
| public String performNullable() { |
| return node.getLockOwner(); |
| } |
| }); |
| } |
| |
| @Override |
| public boolean isDeep() { |
| return getSessionDelegate().safePerform(new NodeOperation<Boolean>(delegate, "isDeep") { |
| @NotNull |
| @Override |
| public Boolean perform() { |
| return node.holdsLock(true); |
| } |
| }); |
| } |
| |
| @Override |
| public boolean isLive() { |
| return context.getSession().isLive() && getSessionDelegate().safePerform( |
| new NodeOperation<Boolean>(delegate, "isLive") { |
| @NotNull |
| @Override |
| public Boolean perform() { |
| return node.holdsLock(false); |
| } |
| }); |
| } |
| |
| |
| @Override |
| public String getLockToken() { |
| return savePerformNullable(new NodeOperation<String>(delegate, "getLockToken") { |
| @Override |
| public String performNullable() { |
| String token = node.getPath(); |
| if (context.getOpenScopedLocks().contains(token)) { |
| return token; |
| } else if (context.getSessionScopedLocks().contains(token)) { |
| // Prevent session-scoped locks from exposing their |
| // tokens to the session that holds the lock. However, |
| // another session of the lock owner will be able to |
| // acquire the lock token and thus release the lock. |
| return null; |
| } else if (node.isLockOwner( |
| context.getSessionDelegate().getAuthInfo().getUserID())) { |
| // The JCR spec allows the implementation to return the |
| // lock token even when the current session isn't already |
| // holding it. We use this feature to allow all sessions |
| // of the user who owns the lock to access its token. |
| return token; |
| } else { |
| return null; |
| } |
| } |
| }); |
| } |
| |
| @Override |
| public long getSecondsRemaining() { |
| if (isLive()) { |
| return Long.MAX_VALUE; |
| } else { |
| return -1; |
| } |
| } |
| |
| @Override |
| public boolean isSessionScoped() { |
| return getSessionDelegate().safePerform(new NodeOperation<Boolean>(delegate, "isSessionScoped") { |
| @NotNull |
| @Override |
| public Boolean perform() { |
| String path = node.getPath(); |
| return context.getSessionScopedLocks().contains(path); |
| } |
| }); |
| } |
| |
| @Override |
| public boolean isLockOwningSession() { |
| return getSessionDelegate().safePerform(new NodeOperation<Boolean>(delegate, "isLockOwningSessions") { |
| @NotNull |
| @Override |
| public Boolean perform() { |
| String path = node.getPath(); |
| return context.getSessionScopedLocks().contains(path) |
| || context.getOpenScopedLocks().contains(path); |
| } |
| }); |
| } |
| |
| @Override |
| public void refresh() throws LockException { |
| if (!isLive()) { |
| throw new LockException("This lock is not alive"); |
| } |
| } |
| |
| //-----------------------------------------------------------< private >-- |
| |
| private SessionDelegate getSessionDelegate() { |
| return context.getSessionDelegate(); |
| } |
| |
| @Nullable |
| private <U> U savePerformNullable(@NotNull SessionOperation<U> op) { |
| try { |
| return context.getSessionDelegate().performNullable(op); |
| } catch (RepositoryException e) { |
| throw new RuntimeException("Unexpected exception thrown by operation " + op, e); |
| } |
| } |
| } |