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 */ 017 package org.apache.camel.builder; 018 019 import java.util.List; 020 021 import org.apache.camel.Processor; 022 import org.apache.camel.model.OnExceptionDefinition; 023 import org.apache.camel.spi.RouteContext; 024 import org.apache.camel.util.ObjectHelper; 025 026 /** 027 * Represents a proxy to an error handler builder which is resolved by named reference 028 * 029 * @version $Revision: 768186 $ 030 */ 031 public class ErrorHandlerBuilderRef extends ErrorHandlerBuilderSupport { 032 public static final String DEFAULT_ERROR_HANDLER_BUILDER = "CamelDefaultErrorHandlerBuilder"; 033 private final String ref; 034 private ErrorHandlerBuilder handler; 035 private boolean supportTransacted; 036 037 public ErrorHandlerBuilderRef(String ref) { 038 this.ref = ref; 039 } 040 041 @Override 042 public void addErrorHandlers(OnExceptionDefinition exception) { 043 if (handler != null) { 044 handler.addErrorHandlers(exception); 045 } 046 super.addErrorHandlers(exception); 047 } 048 049 public Processor createErrorHandler(RouteContext routeContext, Processor processor) throws Exception { 050 if (handler == null) { 051 handler = lookupErrorHandlerBuilder(routeContext); 052 } 053 return handler.createErrorHandler(routeContext, processor); 054 } 055 056 /** 057 * Returns whether a specific error handler builder has been configured or not. 058 * <p/> 059 * Can be used to test if none has been configured and then install a custom error handler builder 060 * replacing the default error handler (that would have been used as fallback otherwise). 061 * <br/> 062 * This is for instance used by the transacted policy to setup a TransactedErrorHandlerBuilder 063 * in camel-spring. 064 */ 065 public boolean isErrorHandlerBuilderConfigued() { 066 return !DEFAULT_ERROR_HANDLER_BUILDER.equals(getRef()); 067 } 068 069 public boolean supportTransacted() { 070 return supportTransacted; 071 } 072 073 public ErrorHandlerBuilder lookupErrorHandlerBuilder(RouteContext routeContext) { 074 if (handler == null) { 075 // if the ref is the default then the we do not have any explicit error handler configured 076 // if that is the case then use error handlers configured on the route, as for instance 077 // the transacted error handler could have been configured on the route so we should use that one 078 if (!isErrorHandlerBuilderConfigued()) { 079 // see if there has been configured a route builder on the route 080 handler = routeContext.getRoute().getErrorHandlerBuilder(); 081 if (handler == null) { 082 handler = routeContext.lookup(routeContext.getRoute().getErrorHandlerRef(), ErrorHandlerBuilder.class); 083 } 084 if (handler == null) { 085 // fallback to the default error handler if none configured on the route 086 handler = new DefaultErrorHandlerBuilder(); 087 } 088 // check if its also a ref with no error handler configuration like me 089 if (handler instanceof ErrorHandlerBuilderRef) { 090 ErrorHandlerBuilderRef other = (ErrorHandlerBuilderRef) handler; 091 if (!other.isErrorHandlerBuilderConfigued()) { 092 // the other has also no explict error handler configured then fallback to the default error handler 093 // otherwise we could recursive loop forever (triggered by createErrorHandler method) 094 handler = new DefaultErrorHandlerBuilder(); 095 // inherit the error handlers from the other as they are to be shared 096 // this is needed by camel-spring when none error handler has been explicit configured 097 handler.setErrorHandlers(other.getErrorHandlers()); 098 } 099 } 100 } else { 101 // use specific configured error handler 102 handler = routeContext.lookup(ref, ErrorHandlerBuilder.class); 103 } 104 105 ObjectHelper.notNull(handler, "error handler '" + ref + "'"); 106 107 // configure if the handler support transacted 108 supportTransacted = handler.supportTransacted(); 109 110 List<OnExceptionDefinition> list = getErrorHandlers(); 111 for (OnExceptionDefinition exceptionType : list) { 112 handler.addErrorHandlers(exceptionType); 113 } 114 } 115 return handler; 116 } 117 118 public String getRef() { 119 return ref; 120 } 121 122 @Override 123 public String toString() { 124 return "ErrorHandlerBuilderRef[" + ref + "]"; 125 } 126 }