| /* |
| * 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.tinkerpop.gremlin.structure.util; |
| |
| import org.apache.tinkerpop.gremlin.structure.Graph; |
| import org.apache.tinkerpop.gremlin.structure.Transaction; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| import java.util.Optional; |
| import java.util.function.Consumer; |
| |
| /** |
| * A base implementation of {@link Transaction} that provides core functionality for transaction listeners using |
| * {@link ThreadLocal}. In this implementation, the listeners are bound to the current thread of execution (usually |
| * the same as the transaction for most graph database implementations). Therefore, when {@link #commit()} is |
| * called on a particular thread, the only listeners that get notified are those bound to that thread. |
| * |
| * @see AbstractThreadedTransaction |
| * |
| * @author Stephen Mallette (http://stephen.genoprime.com) |
| */ |
| public abstract class AbstractThreadLocalTransaction extends AbstractTransaction { |
| protected final ThreadLocal<Consumer<Transaction>> readWriteConsumerInternal = |
| new ThreadLocal<Consumer<Transaction>>() { |
| @Override protected Consumer<Transaction> initialValue() { |
| return READ_WRITE_BEHAVIOR.AUTO; |
| } |
| }; |
| |
| protected final ThreadLocal<Consumer<Transaction>> closeConsumerInternal = |
| new ThreadLocal<Consumer<Transaction>>() { |
| @Override protected Consumer<Transaction> initialValue() { |
| return CLOSE_BEHAVIOR.ROLLBACK; |
| } |
| }; |
| |
| protected final ThreadLocal<List<Consumer<Transaction.Status>>> transactionListeners = new ThreadLocal<List<Consumer<Transaction.Status>>>() { |
| @Override |
| protected List<Consumer<Transaction.Status>> initialValue() { |
| return new ArrayList<>(); |
| } |
| }; |
| |
| public AbstractThreadLocalTransaction(final Graph g) { |
| super(g); |
| } |
| |
| @Override |
| protected void fireOnCommit() { |
| transactionListeners.get().forEach(c -> c.accept(Status.COMMIT)); |
| } |
| |
| @Override |
| protected void fireOnRollback() { |
| transactionListeners.get().forEach(c -> c.accept(Status.ROLLBACK)); |
| } |
| |
| @Override |
| public void addTransactionListener(final Consumer<Status> listener) { |
| transactionListeners.get().add(listener); |
| } |
| |
| @Override |
| public void removeTransactionListener(final Consumer<Status> listener) { |
| transactionListeners.get().remove(listener); |
| } |
| |
| @Override |
| public void clearTransactionListeners() { |
| transactionListeners.get().clear(); |
| } |
| |
| @Override |
| protected void doReadWrite() { |
| readWriteConsumerInternal.get().accept(this); |
| } |
| |
| @Override |
| protected void doClose() { |
| closeConsumerInternal.get().accept(this); |
| closeConsumerInternal.remove(); |
| readWriteConsumerInternal.remove(); |
| } |
| |
| @Override |
| public Transaction onReadWrite(final Consumer<Transaction> consumer) { |
| readWriteConsumerInternal.set(Optional.ofNullable(consumer).orElseThrow(Transaction.Exceptions::onReadWriteBehaviorCannotBeNull)); |
| return this; |
| } |
| |
| @Override |
| public Transaction onClose(final Consumer<Transaction> consumer) { |
| closeConsumerInternal.set(Optional.ofNullable(consumer).orElseThrow(Transaction.Exceptions::onReadWriteBehaviorCannotBeNull)); |
| return this; |
| } |
| } |