| /** |
| * 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.pulsar.functions.instance; |
| |
| import java.util.Iterator; |
| import java.util.concurrent.CompletableFuture; |
| import java.util.concurrent.Executor; |
| import java.util.concurrent.Executors; |
| import java.util.concurrent.LinkedBlockingQueue; |
| import lombok.AccessLevel; |
| import lombok.Getter; |
| import lombok.extern.slf4j.Slf4j; |
| |
| import org.apache.pulsar.functions.api.Function; |
| import org.apache.pulsar.functions.api.Record; |
| |
| import java.util.Map; |
| |
| /** |
| * This is the Java Instance. This is started by the runtimeSpawner using the JavaInstanceClient |
| * program if invoking via a process based invocation or using JavaInstance using a thread |
| * based invocation. |
| */ |
| @Slf4j |
| public class JavaInstance implements AutoCloseable { |
| |
| @Getter(AccessLevel.PACKAGE) |
| private final ContextImpl context; |
| private Function function; |
| private java.util.function.Function javaUtilFunction; |
| |
| // for Async function max out standing items |
| private final InstanceConfig instanceConfig; |
| private final Executor executor; |
| @Getter |
| private final LinkedBlockingQueue<CompletableFuture<Void>> pendingAsyncRequests; |
| |
| public JavaInstance(ContextImpl contextImpl, Object userClassObject, InstanceConfig instanceConfig) { |
| |
| this.context = contextImpl; |
| this.instanceConfig = instanceConfig; |
| this.executor = Executors.newSingleThreadExecutor(); |
| this.pendingAsyncRequests = new LinkedBlockingQueue<>(this.instanceConfig.getMaxPendingAsyncRequests()); |
| |
| // create the functions |
| if (userClassObject instanceof Function) { |
| this.function = (Function) userClassObject; |
| } else { |
| this.javaUtilFunction = (java.util.function.Function) userClassObject; |
| } |
| } |
| |
| public CompletableFuture<JavaExecutionResult> handleMessage(Record<?> record, Object input) { |
| if (context != null) { |
| context.setCurrentMessageContext(record); |
| } |
| |
| final CompletableFuture<JavaExecutionResult> future = new CompletableFuture<>(); |
| JavaExecutionResult executionResult = new JavaExecutionResult(); |
| |
| final Object output; |
| |
| try { |
| if (function != null) { |
| output = function.process(input, context); |
| } else { |
| output = javaUtilFunction.apply(input); |
| } |
| } catch (Exception ex) { |
| executionResult.setUserException(ex); |
| future.complete(executionResult); |
| return future; |
| } |
| |
| if (output instanceof CompletableFuture) { |
| // Function is in format: Function<I, CompletableFuture<O>> |
| try { |
| pendingAsyncRequests.put((CompletableFuture) output); |
| } catch (InterruptedException ie) { |
| log.warn("Exception while put Async requests", ie); |
| executionResult.setUserException(ie); |
| future.complete(executionResult); |
| return future; |
| } |
| |
| ((CompletableFuture) output).whenCompleteAsync((obj, throwable) -> { |
| if (log.isDebugEnabled()) { |
| log.debug("Got result async: object: {}, throwable: {}", obj, throwable); |
| } |
| |
| if (throwable != null) { |
| executionResult.setUserException(new Exception((Throwable)throwable)); |
| pendingAsyncRequests.remove(output); |
| future.complete(executionResult); |
| return; |
| } |
| executionResult.setResult(obj); |
| pendingAsyncRequests.remove(output); |
| future.complete(executionResult); |
| }, executor); |
| } else { |
| if (log.isDebugEnabled()) { |
| log.debug("Got result: object: {}", output); |
| } |
| executionResult.setResult(output); |
| future.complete(executionResult); |
| } |
| |
| return future; |
| } |
| |
| @Override |
| public void close() { |
| } |
| |
| public Map<String, Double> getAndResetMetrics() { |
| return context.getAndResetMetrics(); |
| } |
| |
| public void resetMetrics() { |
| context.resetMetrics(); |
| } |
| |
| public Map<String, Double> getMetrics() { |
| return context.getMetrics(); |
| } |
| } |