/**
* 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.loadbalancer;
import java.util.List;
import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlTransient;
import javax.xml.bind.annotation.XmlType;
import org.apache.camel.AsyncCallback;
import org.apache.camel.Exchange;
import org.apache.camel.Processor;
import org.apache.camel.model.IdentifiedType;
import org.apache.camel.processor.loadbalancer.LoadBalancer;
import org.apache.camel.spi.RouteContext;
import org.apache.camel.util.IntrospectionSupport;
import org.apache.camel.util.ObjectHelper;
import static org.apache.camel.util.ObjectHelper.notNull;
/**
* Represents an XML <loadBalance/> element
*/
@XmlType(name = "loadBalancerType")
@XmlAccessorType(XmlAccessType.FIELD)
public class LoadBalancerType extends IdentifiedType implements LoadBalancer {
@XmlTransient
private LoadBalancer loadBalancer;
@XmlTransient
private String loadBalancerTypeName;
public LoadBalancerType() {
}
public LoadBalancerType(LoadBalancer loadBalancer) {
this.loadBalancer = loadBalancer;
}
protected LoadBalancerType(String loadBalancerTypeName) {
this.loadBalancerTypeName = loadBalancerTypeName;
}
public static LoadBalancer getLoadBalancer(RouteContext routeContext, LoadBalancerType type, String ref) {
if (type == null) {
notNull(ref, "ref or LoadBalancerType");
LoadBalancer loadBalancer = routeContext.lookup(ref, LoadBalancer.class);
if (loadBalancer instanceof LoadBalancerType) {
type = (LoadBalancerType) loadBalancer;
} else {
return loadBalancer;
}
}
return type.getLoadBalancer(routeContext);
}
/**
* 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);
}
}
/**
* Allows derived classes to customize the load balancer
*/
protected void configureLoadBalancer(LoadBalancer loadBalancer) {
}
public LoadBalancer getLoadBalancer(RouteContext routeContext) {
if (loadBalancer == null) {
loadBalancer = createLoadBalancer(routeContext);
ObjectHelper.notNull(loadBalancer, "loadBalancer");
configureLoadBalancer(loadBalancer);
}
return loadBalancer;
}
/**
* Factory method to create the load balancer instance
*/
protected LoadBalancer createLoadBalancer(RouteContext routeContext) {
if (loadBalancerTypeName != null) {
Class type = ObjectHelper.loadClass(loadBalancerTypeName, getClass().getClassLoader());
if (type == null) {
throw new IllegalArgumentException("The class " + loadBalancerTypeName + " is not on the classpath! Cannot use the loadBalancer " + this);
}
return (LoadBalancer) ObjectHelper.newInstance(type);
}
return null;
}
public void addProcessor(Processor processor) {
ObjectHelper.notNull(loadBalancer, "loadBalancer");
loadBalancer.addProcessor(processor);
}
public List<Processor> getProcessors() {
ObjectHelper.notNull(loadBalancer, "loadBalancer");
return loadBalancer.getProcessors();
}
public void removeProcessor(Processor processor) {
ObjectHelper.notNull(loadBalancer, "loadBalancer");
loadBalancer.removeProcessor(processor);
}
public void process(Exchange exchange) throws Exception {
ObjectHelper.notNull(loadBalancer, "loadBalancer");
loadBalancer.process(exchange);
}
public boolean process(Exchange exchange, final AsyncCallback callback) {
ObjectHelper.notNull(loadBalancer, "loadBalancer");
return loadBalancer.process(exchange, new AsyncCallback() {
public void done(boolean doneSynchronously) {
// Only handle the async case...
if (doneSynchronously) {
return;
} else {
callback.done(doneSynchronously);
}
}
});
}
}