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.impl.saga; 018 019import java.util.Map; 020import java.util.concurrent.CompletableFuture; 021import java.util.concurrent.ConcurrentHashMap; 022import java.util.concurrent.ScheduledExecutorService; 023 024import org.apache.camel.CamelContext; 025import org.apache.camel.saga.CamelSagaCoordinator; 026import org.apache.camel.saga.CamelSagaService; 027import org.apache.camel.saga.CamelSagaStep; 028import org.apache.camel.support.ServiceSupport; 029import org.apache.camel.util.ObjectHelper; 030 031/** 032 * A in-memory implementation of a saga service. 033 */ 034public class InMemorySagaService extends ServiceSupport implements CamelSagaService { 035 036 public static final int DEFAULT_MAX_RETRY_ATTEMPTS = 5; 037 038 public static final long DEFAULT_RETRY_DELAY_IN_MILLISECONDS = 5000; 039 040 private CamelContext camelContext; 041 042 private Map<String, CamelSagaCoordinator> coordinators = new ConcurrentHashMap<>(); 043 044 private ScheduledExecutorService executorService; 045 046 private int maxRetryAttempts = DEFAULT_MAX_RETRY_ATTEMPTS; 047 048 private long retryDelayInMilliseconds = DEFAULT_RETRY_DELAY_IN_MILLISECONDS; 049 050 @Override 051 public CompletableFuture<CamelSagaCoordinator> newSaga() { 052 ObjectHelper.notNull(camelContext, "camelContext"); 053 054 String uuid = camelContext.getUuidGenerator().generateUuid(); 055 CamelSagaCoordinator coordinator = new InMemorySagaCoordinator(camelContext, this, uuid); 056 coordinators.put(uuid, coordinator); 057 058 return CompletableFuture.completedFuture(coordinator); 059 } 060 061 @Override 062 public CompletableFuture<CamelSagaCoordinator> getSaga(String id) { 063 return CompletableFuture.completedFuture(coordinators.get(id)); 064 } 065 066 @Override 067 public void registerStep(CamelSagaStep step) { 068 // do nothing 069 } 070 071 @Override 072 protected void doStart() throws Exception { 073 if (this.executorService == null) { 074 this.executorService = camelContext.getExecutorServiceManager() 075 .newDefaultScheduledThreadPool(this, "saga"); 076 } 077 } 078 079 @Override 080 protected void doStop() throws Exception { 081 if (this.executorService != null) { 082 camelContext.getExecutorServiceManager().shutdownGraceful(this.executorService); 083 this.executorService = null; 084 } 085 } 086 087 public ScheduledExecutorService getExecutorService() { 088 return executorService; 089 } 090 091 @Override 092 public void setCamelContext(CamelContext camelContext) { 093 this.camelContext = camelContext; 094 } 095 096 @Override 097 public CamelContext getCamelContext() { 098 return camelContext; 099 } 100 101 public int getMaxRetryAttempts() { 102 return maxRetryAttempts; 103 } 104 105 public void setMaxRetryAttempts(int maxRetryAttempts) { 106 this.maxRetryAttempts = maxRetryAttempts; 107 } 108 109 public long getRetryDelayInMilliseconds() { 110 return retryDelayInMilliseconds; 111 } 112 113 public void setRetryDelayInMilliseconds(long retryDelayInMilliseconds) { 114 this.retryDelayInMilliseconds = retryDelayInMilliseconds; 115 } 116 117}