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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.cloud;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlAttribute;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlElementRef;
import javax.xml.bind.annotation.XmlRootElement;
import javax.xml.bind.annotation.XmlTransient;
import org.apache.camel.CamelContext;
import org.apache.camel.Expression;
import org.apache.camel.NoFactoryAvailableException;
import org.apache.camel.cloud.ServiceExpressionFactory;
import org.apache.camel.impl.cloud.DefaultServiceCallExpression;
import org.apache.camel.impl.cloud.ServiceCallConstants;
import org.apache.camel.model.IdentifiedType;
import org.apache.camel.model.ProcessorDefinition;
import org.apache.camel.model.PropertyDefinition;
import org.apache.camel.model.language.ExpressionDefinition;
import org.apache.camel.spi.Metadata;
import org.apache.camel.util.CamelContextHelper;
import org.apache.camel.util.IntrospectionSupport;
import org.apache.camel.util.ObjectHelper;
@Metadata(label = "routing,cloud")
@XmlRootElement(name = "serviceExpression")
@XmlAccessorType(XmlAccessType.FIELD)
public class ServiceCallExpressionConfiguration extends IdentifiedType implements ServiceExpressionFactory {
@XmlTransient
private final ServiceCallDefinition parent;
@XmlTransient
private final String factoryKey;
@XmlElement(name = "properties") @Metadata(label = "advanced")
private List properties;
@XmlAttribute @Metadata(defaultValue = ServiceCallConstants.SERVICE_HOST)
private String hostHeader = ServiceCallConstants.SERVICE_HOST;
@XmlAttribute @Metadata(defaultValue = ServiceCallConstants.SERVICE_PORT)
private String portHeader = ServiceCallConstants.SERVICE_PORT;
@XmlElementRef(required = false)
private ExpressionDefinition expressionType;
@XmlTransient
private Expression expression;
public ServiceCallExpressionConfiguration() {
this(null, null);
}
public ServiceCallExpressionConfiguration(ServiceCallDefinition parent, String factoryKey) {
this.parent = parent;
this.factoryKey = factoryKey;
}
public ServiceCallDefinition end() {
return this.parent;
}
public ProcessorDefinition endParent() {
return this.parent.end();
}
// *************************************************************************
//
// *************************************************************************
public List getProperties() {
return properties;
}
/**
* Set client properties to use.
*
* These properties are specific to what service call implementation are in
* use. For example if using ribbon, then the client properties are define
* in com.netflix.client.config.CommonClientConfigKey.
*/
public void setProperties(List properties) {
this.properties = properties;
}
/**
* Adds a custom property to use.
*
* These properties are specific to what service call implementation are in
* use. For example if using ribbon, then the client properties are define
* in com.netflix.client.config.CommonClientConfigKey.
*/
public ServiceCallExpressionConfiguration property(String key, String value) {
if (properties == null) {
properties = new ArrayList<>();
}
PropertyDefinition prop = new PropertyDefinition();
prop.setKey(key);
prop.setValue(value);
properties.add(prop);
return this;
}
protected Map getPropertiesAsMap(CamelContext camelContext) throws Exception {
Map answer;
if (properties == null || properties.isEmpty()) {
answer = Collections.emptyMap();
} else {
answer = new HashMap<>();
for (PropertyDefinition prop : properties) {
// support property placeholders
String key = CamelContextHelper.parseText(camelContext, prop.getKey());
String value = CamelContextHelper.parseText(camelContext, prop.getValue());
answer.put(key, value);
}
}
return answer;
}
public String getHostHeader() {
return hostHeader;
}
/**
* The header that holds the service host information, default ServiceCallConstants.SERVICE_HOST
*/
public void setHostHeader(String hostHeader) {
this.hostHeader = hostHeader;
}
public String getPortHeader() {
return portHeader;
}
/**
* The header that holds the service port information, default ServiceCallConstants.SERVICE_PORT
*/
public void setPortHeader(String portHeader) {
this.portHeader = portHeader;
}
public ExpressionDefinition getExpressionType() {
return expressionType;
}
public void setExpressionType(ExpressionDefinition expressionType) {
this.expressionType = expressionType;
}
public Expression getExpression() {
return expression;
}
public void setExpression(Expression expression) {
this.expression = expression;
}
/**
* The header that holds the service host information, default ServiceCallConstants.SERVICE_HOST
*/
public ServiceCallExpressionConfiguration hostHeader(String hostHeader) {
setHostHeader(hostHeader);
return this;
}
/**
* The header that holds the service port information, default ServiceCallConstants.SERVICE_PORT
*/
public ServiceCallExpressionConfiguration portHeader(String portHeader) {
setPortHeader(portHeader);
return this;
}
public ServiceCallExpressionConfiguration expressionType(ExpressionDefinition expressionType) {
setExpressionType(expressionType);
return this;
}
public ServiceCallExpressionConfiguration expression(Expression expression) {
setExpression(expression);
return this;
}
// *************************************************************************
// Factory
// *************************************************************************
@Override
public Expression newInstance(CamelContext camelContext) throws Exception {
Expression answer = getExpression();
if (answer != null) {
return answer;
}
ExpressionDefinition expressionType = getExpressionType();
if (expressionType != null && answer == null) {
return expressionType.createExpression(camelContext);
}
if (factoryKey != null) {
// First try to find the factory from the registry.
ServiceExpressionFactory factory = CamelContextHelper.lookup(camelContext, factoryKey, ServiceExpressionFactory.class);
if (factory != null) {
// If a factory is found in the registry do not re-configure it as
// it should be pre-configured.
answer = factory.newInstance(camelContext);
} else {
Class type;
try {
// Then use Service factory.
type = camelContext.getFactoryFinder(ServiceCallDefinitionConstants.RESOURCE_PATH).findClass(factoryKey);
} catch (Exception e) {
throw new NoFactoryAvailableException(ServiceCallDefinitionConstants.RESOURCE_PATH + factoryKey, e);
}
if (type != null) {
if (ServiceExpressionFactory.class.isAssignableFrom(type)) {
factory = (ServiceExpressionFactory) camelContext.getInjector().newInstance(type);
} else {
throw new IllegalArgumentException(
"Resolving Expression: " + factoryKey + " detected type conflict: Not a ExpressionFactory implementation. Found: " + type.getName());
}
}
try {
Map parameters = new HashMap<>();
IntrospectionSupport.getProperties(this, parameters, null, false);
parameters.replaceAll(
(k, v) -> {
if (v instanceof String) {
try {
v = camelContext.resolvePropertyPlaceholders((String) v);
} catch (Exception e) {
throw new IllegalArgumentException(
String.format("Exception while resolving %s (%s)", k, v.toString()),
e
);
}
}
return v;
}
);
// Convert properties to Map
parameters.put("properties", getPropertiesAsMap(camelContext));
postProcessFactoryParameters(camelContext, parameters);
IntrospectionSupport.setProperties(factory, parameters);
answer = factory.newInstance(camelContext);
} catch (Exception e) {
throw new IllegalArgumentException(e);
}
}
} else {
answer = new DefaultServiceCallExpression(
ObjectHelper.notNull(hostHeader, "hostHeader"),
ObjectHelper.notNull(portHeader, "portHeader")
);
}
return answer;
}
// *************************************************************************
// Utilities
// *************************************************************************
protected void postProcessFactoryParameters(CamelContext camelContext, Map parameters) throws Exception {
}
}