| /* |
| * 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.flink.statefun.flink.core.functions; |
| |
| import java.util.Optional; |
| import java.util.OptionalLong; |
| import javax.annotation.Nullable; |
| import org.apache.flink.core.memory.DataOutputView; |
| import org.apache.flink.statefun.flink.core.message.Message; |
| import org.apache.flink.statefun.flink.core.message.MessageFactory; |
| import org.apache.flink.statefun.sdk.Address; |
| import org.apache.flink.statefun.sdk.AsyncOperationResult; |
| import org.apache.flink.statefun.sdk.AsyncOperationResult.Status; |
| |
| /** |
| * Wraps the original {@link Message} where it's payload is the user supplied metadata associated |
| * with an async operation. |
| */ |
| final class AsyncMessageDecorator<T> implements Message { |
| private final PendingAsyncOperations pendingAsyncOperations; |
| private final long futureId; |
| private final Message message; |
| private final Throwable throwable; |
| private final T result; |
| private final boolean restored; |
| |
| AsyncMessageDecorator( |
| PendingAsyncOperations pendingAsyncOperations, |
| long futureId, |
| Message message, |
| T result, |
| Throwable throwable) { |
| this.futureId = futureId; |
| this.pendingAsyncOperations = pendingAsyncOperations; |
| this.message = message; |
| this.throwable = throwable; |
| this.result = result; |
| this.restored = false; |
| } |
| |
| AsyncMessageDecorator( |
| PendingAsyncOperations asyncOperationState, Long futureId, Message metadataMessage) { |
| this.futureId = futureId; |
| this.pendingAsyncOperations = asyncOperationState; |
| this.message = metadataMessage; |
| this.throwable = null; |
| this.result = null; |
| this.restored = true; |
| } |
| |
| @Nullable |
| @Override |
| public Address source() { |
| return message.source(); |
| } |
| |
| @Override |
| public Address target() { |
| return message.target(); |
| } |
| |
| @Override |
| public Object payload(MessageFactory context, ClassLoader targetClassLoader) { |
| final Status status; |
| if (restored) { |
| status = Status.UNKNOWN; |
| } else if (throwable == null) { |
| status = Status.SUCCESS; |
| } else { |
| status = Status.FAILURE; |
| } |
| Object metadata = message.payload(context, targetClassLoader); |
| return new AsyncOperationResult<>(metadata, status, result, throwable); |
| } |
| |
| @Override |
| public OptionalLong isBarrierMessage() { |
| return OptionalLong.empty(); |
| } |
| |
| @Override |
| public Optional<String> cancellationToken() { |
| return message.cancellationToken(); |
| } |
| |
| @Override |
| public void postApply() { |
| pendingAsyncOperations.remove(source(), futureId); |
| } |
| |
| @Override |
| public Message copy(MessageFactory context) { |
| throw new UnsupportedOperationException(); |
| } |
| |
| @Override |
| public void writeTo(MessageFactory context, DataOutputView target) { |
| throw new UnsupportedOperationException(); |
| } |
| } |