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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.model;
import java.util.Map;
import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlAnyAttribute;
import javax.xml.bind.annotation.XmlTransient;
import javax.xml.bind.annotation.XmlType;
import javax.xml.namespace.QName;
import org.apache.camel.processor.loadbalancer.LoadBalancer;
import org.apache.camel.spi.Metadata;
import org.apache.camel.spi.RouteContext;
import org.apache.camel.util.IntrospectionSupport;
import org.apache.camel.util.StringHelper;
/**
* Balances message processing among a number of nodes
*/
@Metadata(label = "eip,routing")
@XmlType(name = "loadBalancer")
@XmlAccessorType(XmlAccessType.FIELD)
public class LoadBalancerDefinition extends IdentifiedType implements OtherAttributesAware {
@XmlTransient
private LoadBalancer loadBalancer;
@XmlTransient
private String loadBalancerTypeName;
// use xs:any to support optional property placeholders
@XmlAnyAttribute
private Map otherAttributes;
public LoadBalancerDefinition() {
}
public LoadBalancerDefinition(LoadBalancer loadBalancer) {
this.loadBalancer = loadBalancer;
}
protected LoadBalancerDefinition(String loadBalancerTypeName) {
this.loadBalancerTypeName = loadBalancerTypeName;
}
/**
* Sets a named property on the data format instance using introspection
*/
protected void setProperty(Object bean, String name, Object value) {
try {
IntrospectionSupport.setProperty(bean, name, value);
} catch (Exception e) {
throw new IllegalArgumentException("Failed to set property " + name + " on " + bean + ". Reason: " + e, e);
}
}
/**
* Maximum number of outputs, as some load balancers only support 1 processor
*/
protected int getMaximumNumberOfOutputs() {
return Integer.MAX_VALUE;
}
/**
* Allows derived classes to customize the load balancer
*/
protected void configureLoadBalancer(LoadBalancer loadBalancer) {
}
public LoadBalancer getLoadBalancer(RouteContext routeContext) {
return loadBalancer;
}
public void setLoadBalancer(LoadBalancer loadBalancer) {
this.loadBalancer = loadBalancer;
}
@Override
public Map getOtherAttributes() {
return otherAttributes;
}
@Override
public void setOtherAttributes(Map otherAttributes) {
this.otherAttributes = otherAttributes;
}
/**
* Factory method to create the load balancer from the loadBalancerTypeName
*/
protected LoadBalancer createLoadBalancer(RouteContext routeContext) {
StringHelper.notEmpty(loadBalancerTypeName, "loadBalancerTypeName", this);
LoadBalancer answer = null;
if (loadBalancerTypeName != null) {
Class type = routeContext.getCamelContext().getClassResolver().resolveClass(loadBalancerTypeName, LoadBalancer.class);
if (type == null) {
throw new IllegalArgumentException("Cannot find class: " + loadBalancerTypeName + " in the classpath");
}
answer = (LoadBalancer) routeContext.getCamelContext().getInjector().newInstance(type);
configureLoadBalancer(answer);
}
return answer;
}
@Override
public String toString() {
if (loadBalancer != null) {
return loadBalancer.toString();
} else {
return loadBalancerTypeName;
}
}
}