001/** 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 */ 017package org.apache.camel.processor.saga; 018 019import java.util.concurrent.CompletableFuture; 020 021import org.apache.camel.AsyncCallback; 022import org.apache.camel.CamelContext; 023import org.apache.camel.Exchange; 024import org.apache.camel.Processor; 025import org.apache.camel.model.SagaCompletionMode; 026import org.apache.camel.saga.CamelSagaCoordinator; 027import org.apache.camel.saga.CamelSagaService; 028import org.apache.camel.saga.CamelSagaStep; 029 030/** 031 * Saga processor implementing the REQUIRED propagation mode. 032 */ 033public class RequiredSagaProcessor extends SagaProcessor { 034 035 public RequiredSagaProcessor(CamelContext camelContext, Processor childProcessor, CamelSagaService sagaService, SagaCompletionMode completionMode, CamelSagaStep step) { 036 super(camelContext, childProcessor, sagaService, completionMode, step); 037 } 038 039 @Override 040 public boolean process(Exchange exchange, AsyncCallback callback) { 041 getCurrentSagaCoordinator(exchange).whenComplete((existingCoordinator, ex) -> ifNotException(ex, exchange, callback, () -> { 042 CompletableFuture<CamelSagaCoordinator> coordinatorFuture; 043 final boolean inheritedCoordinator; 044 if (existingCoordinator != null) { 045 coordinatorFuture = CompletableFuture.completedFuture(existingCoordinator); 046 inheritedCoordinator = true; 047 } else { 048 coordinatorFuture = sagaService.newSaga(); 049 inheritedCoordinator = false; 050 } 051 052 coordinatorFuture.whenComplete((coordinator, ex2) -> ifNotException(ex2, exchange, callback, () -> { 053 setCurrentSagaCoordinator(exchange, coordinator); 054 coordinator.beginStep(exchange, step).whenComplete((done, ex3) -> ifNotException(ex3, exchange, callback, () -> { 055 super.process(exchange, doneSync -> { 056 if (!inheritedCoordinator) { 057 // Saga starts and ends here 058 handleSagaCompletion(exchange, coordinator, null, callback); 059 } else { 060 callback.done(false); 061 } 062 }); 063 })); 064 })); 065 })); 066 067 return false; 068 } 069}