| /* |
| * 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.plugins.document; |
| |
| import java.util.List; |
| import java.util.concurrent.Callable; |
| import java.util.concurrent.CountDownLatch; |
| import java.util.concurrent.ExecutionException; |
| import java.util.concurrent.Future; |
| |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import com.google.common.collect.Lists; |
| import com.google.common.util.concurrent.Futures; |
| import com.google.common.util.concurrent.SettableFuture; |
| |
| import static com.google.common.base.Preconditions.checkArgument; |
| import static com.google.common.base.Preconditions.checkState; |
| import static org.apache.jackrabbit.oak.plugins.document.Collection.NODES; |
| |
| /** |
| * Combines multiple {@link UpdateOp} into a single call to the |
| * {@link DocumentStore}. |
| */ |
| final class BatchCommit { |
| |
| private static final Logger LOG = LoggerFactory.getLogger(BatchCommit.class); |
| |
| private final CountDownLatch finished = new CountDownLatch(1); |
| private final String id; |
| private final BatchCommitQueue queue; |
| |
| private List<UpdateOp> ops; |
| private List<Future<NodeDocument>> results; |
| |
| private boolean executing; |
| |
| BatchCommit(String id, BatchCommitQueue queue, boolean onHold) { |
| this.id = id; |
| this.queue = queue; |
| if (onHold) { |
| ops = Lists.newArrayList(); |
| results = Lists.newArrayList(); |
| } |
| } |
| |
| String getId() { |
| return id; |
| } |
| |
| Callable<NodeDocument> enqueue(final UpdateOp op) { |
| checkArgument(op.getId().equals(id), |
| "Cannot add UpdateOp with id %s to BatchCommit with id %s", |
| op.getId(), id); |
| Callable<NodeDocument> result; |
| synchronized (this) { |
| checkState(!executing, "Cannot enqueue when batch is already executing"); |
| if (ops != null) { |
| ops.add(op); |
| result = new Callable<NodeDocument>() { |
| int idx = ops.size() - 1; |
| @Override |
| public NodeDocument call() throws Exception { |
| synchronized (BatchCommit.this) { |
| while (!executing) { |
| LOG.debug("Waiting until BatchCommit is executing. {}", id); |
| BatchCommit.this.wait(); |
| } |
| } |
| try { |
| return execute(idx).get(); |
| } catch (ExecutionException e) { |
| throw DocumentStoreException.convert(e.getCause()); |
| } |
| } |
| }; |
| } else { |
| // not on hold and no other operation in this batch |
| executing = true; |
| result = new Callable<NodeDocument>() { |
| @Override |
| public NodeDocument call() throws Exception { |
| try { |
| return queue.getStore().findAndUpdate(NODES, op); |
| } finally { |
| queue.finished(BatchCommit.this); |
| } |
| } |
| }; |
| } |
| } |
| return result; |
| } |
| |
| void release() { |
| synchronized (this) { |
| executing = true; |
| notifyAll(); |
| } |
| } |
| |
| Future<NodeDocument> execute(int idx) { |
| if (idx == 0) { |
| NodeDocument before = null; |
| try { |
| UpdateOp combined = UpdateOp.combine(id, ops); |
| LOG.debug("Batch committing {} updates", ops.size()); |
| before = queue.getStore().findAndUpdate(NODES, combined); |
| } catch (Throwable t) { |
| LOG.warn("BatchCommit failed, will retry individually. " + t.getMessage()); |
| } finally { |
| queue.finished(this); |
| } |
| try { |
| if (before == null) { |
| // batch commit unsuccessful, execute individually |
| executeIndividually(); |
| } else { |
| populateResults(before); |
| } |
| } finally { |
| finished.countDown(); |
| } |
| } else { |
| try { |
| finished.await(); |
| } catch (InterruptedException e) { |
| String msg = "Interrupted while waiting for batch commit to finish"; |
| return Futures.immediateFailedFuture(new DocumentStoreException(msg)); |
| } |
| } |
| return results.get(idx); |
| } |
| |
| void executeIndividually() { |
| DocumentStore store = queue.getStore(); |
| for (UpdateOp op : ops) { |
| SettableFuture<NodeDocument> result = SettableFuture.create(); |
| try { |
| result.set(store.findAndUpdate(NODES, op)); |
| } catch (Throwable t) { |
| result.setException(t); |
| } |
| results.add(result); |
| } |
| } |
| |
| void populateResults(NodeDocument before) { |
| DocumentStore store = queue.getStore(); |
| for (UpdateOp op : ops) { |
| results.add(Futures.immediateFuture(before)); |
| NodeDocument after = new NodeDocument(store); |
| before.deepCopy(after); |
| UpdateUtils.applyChanges(after, op); |
| before = after; |
| } |
| } |
| } |