| /** |
| * 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.distributedlog.zk; |
| |
| import com.google.common.collect.Lists; |
| import org.apache.distributedlog.ZooKeeperClient; |
| import org.apache.distributedlog.util.FutureUtils; |
| import org.apache.distributedlog.util.Transaction; |
| import com.twitter.util.Future; |
| import com.twitter.util.Promise; |
| import org.apache.zookeeper.AsyncCallback; |
| import org.apache.zookeeper.KeeperException; |
| import org.apache.zookeeper.OpResult; |
| |
| import java.util.List; |
| import java.util.concurrent.atomic.AtomicBoolean; |
| |
| /** |
| * ZooKeeper Transaction |
| */ |
| public class ZKTransaction implements Transaction<Object>, AsyncCallback.MultiCallback { |
| |
| private final ZooKeeperClient zkc; |
| private final List<ZKOp> ops; |
| private final List<org.apache.zookeeper.Op> zkOps; |
| private final Promise<Void> result; |
| private final AtomicBoolean done = new AtomicBoolean(false); |
| |
| public ZKTransaction(ZooKeeperClient zkc) { |
| this.zkc = zkc; |
| this.ops = Lists.newArrayList(); |
| this.zkOps = Lists.newArrayList(); |
| this.result = new Promise<Void>(); |
| } |
| |
| @Override |
| public void addOp(Op<Object> operation) { |
| if (done.get()) { |
| throw new IllegalStateException("Add an operation to a finished transaction"); |
| } |
| assert(operation instanceof ZKOp); |
| ZKOp zkOp = (ZKOp) operation; |
| this.ops.add(zkOp); |
| this.zkOps.add(zkOp.getOp()); |
| } |
| |
| @Override |
| public Future<Void> execute() { |
| if (!done.compareAndSet(false, true)) { |
| return result; |
| } |
| try { |
| zkc.get().multi(zkOps, this, result); |
| } catch (ZooKeeperClient.ZooKeeperConnectionException e) { |
| result.setException(FutureUtils.zkException(e, "")); |
| } catch (InterruptedException e) { |
| result.setException(FutureUtils.zkException(e, "")); |
| } |
| return result; |
| } |
| |
| @Override |
| public void abort(Throwable cause) { |
| if (!done.compareAndSet(false, true)) { |
| return; |
| } |
| for (int i = 0; i < ops.size(); i++) { |
| ops.get(i).abortOpResult(cause, null); |
| } |
| FutureUtils.setException(result, cause); |
| } |
| |
| @Override |
| public void processResult(int rc, String path, Object ctx, List<OpResult> results) { |
| if (KeeperException.Code.OK.intValue() == rc) { // transaction succeed |
| for (int i = 0; i < ops.size(); i++) { |
| ops.get(i).commitOpResult(results.get(i)); |
| } |
| FutureUtils.setValue(result, null); |
| } else { |
| KeeperException ke = KeeperException.create(KeeperException.Code.get(rc)); |
| for (int i = 0; i < ops.size(); i++) { |
| ops.get(i).abortOpResult(ke, null != results ? results.get(i) : null); |
| } |
| FutureUtils.setException(result, ke); |
| } |
| } |
| } |