| /* |
| * 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.camel.component.reactive.streams; |
| |
| import java.util.concurrent.ExecutorService; |
| |
| import org.apache.camel.AsyncCallback; |
| import org.apache.camel.Exchange; |
| import org.apache.camel.Processor; |
| import org.apache.camel.component.reactive.streams.api.CamelReactiveStreamsService; |
| import org.apache.camel.support.DefaultConsumer; |
| import org.apache.camel.util.ObjectHelper; |
| |
| /** |
| * The Camel reactive-streams consumer. |
| */ |
| public class ReactiveStreamsConsumer extends DefaultConsumer { |
| |
| private final ReactiveStreamsEndpoint endpoint; |
| private final CamelReactiveStreamsService service; |
| private ExecutorService executor; |
| |
| public ReactiveStreamsConsumer(ReactiveStreamsEndpoint endpoint, Processor processor, CamelReactiveStreamsService service) { |
| super(endpoint, processor); |
| this.endpoint = endpoint; |
| this.service = ObjectHelper.notNull(service, "service"); |
| } |
| |
| @Override |
| protected void doStart() throws Exception { |
| super.doStart(); |
| |
| int poolSize = endpoint.getConcurrentConsumers(); |
| if (executor == null) { |
| executor = getEndpoint().getCamelContext().getExecutorServiceManager().newFixedThreadPool(this, getEndpoint().getEndpointUri(), poolSize); |
| } |
| |
| this.service.attachCamelConsumer(endpoint.getStream(), this); |
| } |
| |
| @Override |
| protected void doStop() throws Exception { |
| super.doStop(); |
| this.service.detachCamelConsumer(endpoint.getStream()); |
| |
| if (executor != null) { |
| endpoint.getCamelContext().getExecutorServiceManager().shutdownNow(executor); |
| executor = null; |
| } |
| } |
| |
| public boolean process(Exchange exchange, AsyncCallback callback) { |
| exchange.getIn().setHeader(ReactiveStreamsConstants.REACTIVE_STREAMS_EVENT_TYPE, "onNext"); |
| return doSend(exchange, callback); |
| } |
| |
| public void onComplete() { |
| if (endpoint.isForwardOnComplete()) { |
| Exchange exchange = endpoint.createExchange(); |
| exchange.getIn().setHeader(ReactiveStreamsConstants.REACTIVE_STREAMS_EVENT_TYPE, "onComplete"); |
| |
| doSend(exchange, done -> { |
| }); |
| } |
| } |
| |
| public void onError(Throwable error) { |
| if (endpoint.isForwardOnError()) { |
| Exchange exchange = endpoint.createExchange(); |
| exchange.getIn().setHeader(ReactiveStreamsConstants.REACTIVE_STREAMS_EVENT_TYPE, "onError"); |
| exchange.getIn().setBody(error); |
| |
| doSend(exchange, done -> { |
| }); |
| } |
| } |
| |
| private boolean doSend(Exchange exchange, AsyncCallback callback) { |
| ExecutorService executorService = this.executor; |
| if (executorService != null && this.isRunAllowed()) { |
| |
| executorService.execute(() -> this.getAsyncProcessor().process(exchange, doneSync -> { |
| if (exchange.getException() != null) { |
| getExceptionHandler().handleException("Error processing exchange", exchange, exchange.getException()); |
| } |
| |
| callback.done(doneSync); |
| })); |
| return false; |
| |
| } else { |
| log.warn("Consumer not ready to process exchanges. The exchange {} will be discarded", exchange); |
| callback.done(true); |
| return true; |
| } |
| } |
| |
| @Override |
| public ReactiveStreamsEndpoint getEndpoint() { |
| return endpoint; |
| } |
| |
| } |