| /* |
| * 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.ignite.internal; |
| |
| import org.apache.ignite.IgniteCheckedException; |
| import org.apache.ignite.internal.util.future.IgniteFutureImpl; |
| import org.apache.ignite.lang.IgniteAsyncSupport; |
| import org.apache.ignite.lang.IgniteFuture; |
| |
| /** |
| * Adapter for {@link org.apache.ignite.lang.IgniteAsyncSupport}. |
| */ |
| public class AsyncSupportAdapter<T extends IgniteAsyncSupport> implements IgniteAsyncSupport { |
| /** Future for previous asynchronous operation. */ |
| protected ThreadLocal<IgniteFuture<?>> curFut; |
| |
| /** |
| * Default constructor. |
| */ |
| public AsyncSupportAdapter() { |
| // No-op. |
| } |
| |
| /** |
| * @param async Async enabled flag. |
| */ |
| public AsyncSupportAdapter(boolean async) { |
| if (async) |
| curFut = new ThreadLocal<>(); |
| } |
| |
| /** {@inheritDoc} */ |
| @Override public T withAsync() { |
| if (isAsync()) |
| return (T)this; |
| |
| return createAsyncInstance(); |
| } |
| |
| /** |
| * Creates component with asynchronous mode enabled. |
| * |
| * @return Component with asynchronous mode enabled. |
| */ |
| protected T createAsyncInstance() { |
| throw new UnsupportedOperationException(); |
| } |
| |
| /** {@inheritDoc} */ |
| @Override public boolean isAsync() { |
| return curFut != null; |
| } |
| |
| /** {@inheritDoc} */ |
| @Override public <R> IgniteFuture<R> future() { |
| return future(true); |
| } |
| |
| /** |
| * Gets and optionally resets future for previous asynchronous operation. |
| * |
| * @param reset Specifies whether to reset future. |
| * |
| * @return Future for previous asynchronous operation. |
| */ |
| public <R> IgniteFuture<R> future(boolean reset) { |
| if (curFut == null) |
| throw new IllegalStateException("Asynchronous mode is disabled."); |
| |
| IgniteFuture<?> fut = curFut.get(); |
| |
| if (fut == null) |
| throw new IllegalStateException("Asynchronous operation not started."); |
| |
| if (reset) |
| curFut.set(null); |
| |
| return (IgniteFuture<R>)fut; |
| } |
| |
| /** |
| * @param fut Future. |
| * @return If async mode is enabled saves future and returns {@code null}, |
| * otherwise waits for future and returns result. |
| * @throws IgniteCheckedException If asynchronous mode is disabled and future failed. |
| */ |
| public <R> R saveOrGet(IgniteInternalFuture<R> fut) throws IgniteCheckedException { |
| if (curFut != null) { |
| curFut.set(createFuture(fut)); |
| |
| return null; |
| } |
| else |
| return fut.get(); |
| } |
| |
| /** |
| * @param fut Internal future. |
| * @return Public API future. |
| */ |
| protected <R> IgniteFuture<R> createFuture(IgniteInternalFuture<R> fut) { |
| return new IgniteFutureImpl<>(fut); |
| } |
| } |