/*
* Copyright 2013 Red Hat Inc. and/or its affiliates and other contributors.
*
* Licensed 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.switchyard.handlers;
import java.util.List;
import org.switchyard.BaseHandler;
import org.switchyard.Exchange;
import org.switchyard.ExchangePhase;
import org.switchyard.HandlerException;
import org.switchyard.Service;
import org.switchyard.ServiceDomain;
import org.switchyard.metadata.ServiceOperation;
import org.switchyard.policy.Policy;
import org.switchyard.policy.PolicyUtil;
import org.switchyard.runtime.RuntimeMessages;
/**
* The AddressingHandler resolves service instances based on a service reference.
*/
public class AddressingHandler extends BaseHandler {
private ServiceDomain _domain;
/**
* Create a new AddressingHandler for the specified domain.
* @param domain services available for routing
*/
public AddressingHandler(ServiceDomain domain) {
_domain = domain;
}
@Override
public void handleMessage(Exchange exchange) throws HandlerException {
// only set the provider on the 'IN' phase
if (ExchangePhase.IN != exchange.getPhase()) {
return;
}
// is a provider already set?
if (exchange.getProvider() != null) {
return;
}
List<Service> services = _domain.getServices(exchange.getConsumer().getTargetServiceName());
if (services == null || services.isEmpty()) {
throw RuntimeMessages.MESSAGES.noRegisteredService(exchange.getConsumer().getName().toString());
}
// At this stage, just pick the first service implementation we find and go with
// it. In the future, it would be nice if we could make this pluggable.
Service service = services.get(0);
ServiceOperation consumerOp = exchange.getContract().getConsumerOperation();
ServiceOperation providerOp = service.getInterface().getOperation(consumerOp.getName());
if (providerOp == null) {
// try for a default operation
if (service.getInterface().getOperations().size() == 1) {
providerOp = service.getInterface().getOperations().iterator().next();
} else {
throw RuntimeMessages.MESSAGES.operationNotIncluded(consumerOp.getName(),
service.getName().toString());
}
}
// set provider contract and details on exchange
exchange.provider(service, providerOp);
for (Policy policy : service.getServiceMetadata().getRequiredPolicies()) {
PolicyUtil.require(exchange, policy);
}
}
}