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The Core Camel Java DSL based router
/**
* 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.builder;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.apache.camel.ErrorHandlerFactory;
import org.apache.camel.Processor;
import org.apache.camel.model.ModelCamelContext;
import org.apache.camel.model.OnExceptionDefinition;
import org.apache.camel.spi.RouteContext;
import org.apache.camel.util.ObjectHelper;
/**
* Represents a proxy to an error handler builder which is resolved by named reference
*
* @version
*/
public class ErrorHandlerBuilderRef extends ErrorHandlerBuilderSupport {
public static final String DEFAULT_ERROR_HANDLER_BUILDER = "CamelDefaultErrorHandlerBuilder";
private final String ref;
private final Map handlers = new HashMap();
private boolean supportTransacted;
public ErrorHandlerBuilderRef(String ref) {
this.ref = ref;
}
@Override
public void addErrorHandlers(RouteContext routeContext, OnExceptionDefinition exception) {
ErrorHandlerBuilder handler = handlers.get(routeContext);
if (handler != null) {
handler.addErrorHandlers(routeContext, exception);
}
super.addErrorHandlers(routeContext, exception);
}
@Override
public boolean removeOnExceptionList(String id) {
for (RouteContext routeContext : handlers.keySet()) {
if (getRouteId(routeContext).equals(id)) {
handlers.remove(routeContext);
break;
}
}
return super.removeOnExceptionList(id);
}
public Processor createErrorHandler(RouteContext routeContext, Processor processor) throws Exception {
ErrorHandlerBuilder handler = handlers.get(routeContext);
if (handler == null) {
handler = createErrorHandler(routeContext);
handlers.put(routeContext, handler);
}
return handler.createErrorHandler(routeContext, processor);
}
public boolean supportTransacted() {
return supportTransacted;
}
@Override
public ErrorHandlerBuilder cloneBuilder() {
ErrorHandlerBuilderRef answer = new ErrorHandlerBuilderRef(ref);
cloneBuilder(answer);
return answer;
}
protected void cloneBuilder(ErrorHandlerBuilderRef other) {
super.cloneBuilder(other);
// no need to copy the handlers
other.supportTransacted = supportTransacted;
}
/**
* Lookup the error handler by the given ref
*
* @param routeContext the route context
* @param ref reference id for the error handler
* @return the error handler
*/
public static ErrorHandlerFactory lookupErrorHandlerBuilder(RouteContext routeContext, String ref) {
return lookupErrorHandlerBuilder(routeContext, ref, true);
}
/**
* Lookup the error handler by the given ref
*
* @param routeContext the route context
* @param ref reference id for the error handler
* @param mandatory whether the error handler must exists, if not a {@link org.apache.camel.NoSuchBeanException} is thrown
* @return the error handler
*/
public static ErrorHandlerFactory lookupErrorHandlerBuilder(RouteContext routeContext, String ref, boolean mandatory) {
ErrorHandlerFactory answer;
// if the ref is the default then we do not have any explicit error handler configured
// if that is the case then use error handlers configured on the route, as for instance
// the transacted error handler could have been configured on the route so we should use that one
if (!isErrorHandlerBuilderConfigured(ref)) {
// see if there has been configured a route builder on the route
answer = routeContext.getRoute().getErrorHandlerBuilder();
if (answer == null && routeContext.getRoute().getErrorHandlerRef() != null) {
answer = routeContext.lookup(routeContext.getRoute().getErrorHandlerRef(), ErrorHandlerBuilder.class);
}
if (answer == null) {
// fallback to the default error handler if none configured on the route
answer = new DefaultErrorHandlerBuilder();
}
// check if its also a ref with no error handler configuration like me
if (answer instanceof ErrorHandlerBuilderRef) {
ErrorHandlerBuilderRef other = (ErrorHandlerBuilderRef) answer;
String otherRef = other.getRef();
if (!isErrorHandlerBuilderConfigured(otherRef)) {
// the other has also no explicit error handler configured then fallback to the handler
// configured on the parent camel context
answer = lookupErrorHandlerBuilder((ModelCamelContext)routeContext.getCamelContext());
}
if (answer == null) {
// the other has also no explicit error handler configured then fallback to the default error handler
// otherwise we could recursive loop forever (triggered by createErrorHandler method)
answer = new DefaultErrorHandlerBuilder();
}
// inherit the error handlers from the other as they are to be shared
// this is needed by camel-spring when none error handler has been explicit configured
((ErrorHandlerBuilder)answer).setErrorHandlers(routeContext, other.getErrorHandlers(routeContext));
}
} else {
// use specific configured error handler
if (mandatory) {
answer = routeContext.mandatoryLookup(ref, ErrorHandlerBuilder.class);
} else {
answer = routeContext.lookup(ref, ErrorHandlerBuilder.class);
}
}
return answer;
}
protected static ErrorHandlerFactory lookupErrorHandlerBuilder(ModelCamelContext camelContext) {
@SuppressWarnings("deprecation")
ErrorHandlerFactory answer = camelContext.getErrorHandlerBuilder();
if (answer instanceof ErrorHandlerBuilderRef) {
ErrorHandlerBuilderRef other = (ErrorHandlerBuilderRef) answer;
String otherRef = other.getRef();
if (isErrorHandlerBuilderConfigured(otherRef)) {
answer = camelContext.getRegistry().lookupByNameAndType(otherRef, ErrorHandlerBuilder.class);
if (answer == null) {
throw new IllegalArgumentException("ErrorHandlerBuilder with id " + otherRef + " not found in registry.");
}
}
}
return answer;
}
/**
* Returns whether a specific error handler builder has been configured or not.
*
* Can be used to test if none has been configured and then install a custom error handler builder
* replacing the default error handler (that would have been used as fallback otherwise).
*
* This is for instance used by the transacted policy to setup a TransactedErrorHandlerBuilder
* in camel-spring.
*/
public static boolean isErrorHandlerBuilderConfigured(String ref) {
return !DEFAULT_ERROR_HANDLER_BUILDER.equals(ref);
}
public String getRef() {
return ref;
}
private ErrorHandlerBuilder createErrorHandler(RouteContext routeContext) {
ErrorHandlerBuilder handler = (ErrorHandlerBuilder)lookupErrorHandlerBuilder(routeContext, getRef());
ObjectHelper.notNull(handler, "error handler '" + ref + "'");
// configure if the handler support transacted
supportTransacted = handler.supportTransacted();
List list = getErrorHandlers(routeContext);
if (list != null) {
for (OnExceptionDefinition exceptionType : list) {
handler.addErrorHandlers(routeContext, exceptionType);
}
}
return handler;
}
@Override
public String toString() {
return "ErrorHandlerBuilderRef[" + ref + "]";
}
}