/*
* Copyright 2016-2017 the original author or authors.
*
* 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.springframework.integration.dsl;
import org.springframework.expression.Expression;
import org.springframework.integration.channel.DirectChannel;
import org.springframework.integration.core.GenericSelector;
import org.springframework.integration.core.MessageSelector;
import org.springframework.integration.filter.ExpressionEvaluatingSelector;
import org.springframework.integration.filter.MethodInvokingSelector;
import org.springframework.integration.handler.LambdaMessageProcessor;
import org.springframework.integration.router.RecipientListRouter;
import org.springframework.messaging.MessageChannel;
import org.springframework.util.Assert;
import org.springframework.util.StringUtils;
/**
* An {@link AbstractRouterSpec} for a {@link RecipientListRouter}.
*
* @author Artem Bilan
* @author Gary Russell
*
* @since 5.0
*/
public class RecipientListRouterSpec extends AbstractRouterSpec<RecipientListRouterSpec, RecipientListRouter> {
RecipientListRouterSpec() {
super(new RecipientListRouter());
}
/**
* Adds a recipient channel that always will be selected.
* @param channelName the channel name.
* @return the router spec.
*/
public RecipientListRouterSpec recipient(String channelName) {
return recipient(channelName, (String) null);
}
/**
* Adds a recipient channel that will be selected if the the expression evaluates to 'true'.
* @param channelName the channel name.
* @param expression the expression.
* @return the router spec.
*/
public RecipientListRouterSpec recipient(String channelName, String expression) {
if (StringUtils.hasText(expression)) {
return recipient(channelName, PARSER.parseExpression(expression));
}
else {
this.handler.addRecipient(channelName);
return _this();
}
}
/**
* Adds a recipient channel that will be selected if the the expression evaluates to 'true'.
* @param channelName the channel name.
* @param expression the expression.
* @return the router spec.
*/
public RecipientListRouterSpec recipient(String channelName, Expression expression) {
ExpressionEvaluatingSelector selector = new ExpressionEvaluatingSelector(expression);
this.handler.addRecipient(channelName, selector);
this.componentsToRegister.add(selector);
return _this();
}
/**
* Adds a recipient channel that will be selected if the the selector's accept method returns 'true'.
* @param channelName the channel name.
* @param selector the selector.
* @return the router spec.
*/
public RecipientListRouterSpec recipientMessageSelector(String channelName, MessageSelector selector) {
return recipient(channelName, selector);
}
/**
* Adds a recipient channel that will be selected if the the selector's accept method returns 'true'.
* @param channelName the channel name.
* @param selector the selector.
* @param <P> the selector source type.
* @return the router spec.
*/
public <P> RecipientListRouterSpec recipient(String channelName, GenericSelector<P> selector) {
MessageSelector messageSelector;
if (selector instanceof MessageSelector) {
messageSelector = (MessageSelector) selector;
}
else {
messageSelector =
isLambda(selector)
? new MethodInvokingSelector(new LambdaMessageProcessor(selector, null))
: new MethodInvokingSelector(selector);
}
this.handler.addRecipient(channelName, messageSelector);
return _this();
}
private static boolean isLambda(Object o) {
Class<?> aClass = o.getClass();
return aClass.isSynthetic() && !aClass.isAnonymousClass() && !aClass.isLocalClass();
}
/**
* Adds a recipient channel that always will be selected.
* @param channel the recipient channel.
* @return the router spec.
*/
public RecipientListRouterSpec recipient(MessageChannel channel) {
return recipient(channel, (String) null);
}
/**
* Adds a recipient channel that will be selected if the the expression evaluates to 'true'.
* @param channel the recipient channel.
* @param expression the expression.
* @return the router spec.
*/
public RecipientListRouterSpec recipient(MessageChannel channel, String expression) {
return recipient(channel, StringUtils.hasText(expression) ? PARSER.parseExpression(expression) : null);
}
/**
* Adds a recipient channel that will be selected if the the expression evaluates to 'true'.
* @param channel the recipient channel.
* @param expression the expression.
* @return the router spec.
*/
public RecipientListRouterSpec recipient(MessageChannel channel, Expression expression) {
if (expression != null) {
ExpressionEvaluatingSelector selector = new ExpressionEvaluatingSelector(expression);
this.handler.addRecipient(channel, selector);
this.componentsToRegister.add(selector);
}
else {
this.handler.addRecipient(channel);
}
return _this();
}
/**
* Adds a recipient channel that will be selected if the the selector's accept method returns 'true'.
* @param channel the recipient channel.
* @param selector the selector.
* @return the router spec.
*/
public RecipientListRouterSpec recipientMessageSelector(MessageChannel channel, MessageSelector selector) {
return recipient(channel, selector);
}
/**
* Adds a recipient channel that will be selected if the the selector's accept method returns 'true'.
* @param channel the recipient channel.
* @param selector the selector.
* @param <P> the selector source type.
* @return the router spec.
*/
public <P> RecipientListRouterSpec recipient(MessageChannel channel, GenericSelector<P> selector) {
MessageSelector messageSelector;
if (selector instanceof MessageSelector) {
messageSelector = (MessageSelector) selector;
}
else {
messageSelector =
isLambda(selector)
? new MethodInvokingSelector(new LambdaMessageProcessor(selector, null))
: new MethodInvokingSelector(selector);
}
this.handler.addRecipient(channel, messageSelector);
return _this();
}
/**
* Adds a subflow that will be invoked if the selector's accept methods returns 'true'.
* @param selector the selector.
* @param subFlow the subflow.
* @return the router spec.
*/
public RecipientListRouterSpec recipientMessageSelectorFlow(MessageSelector selector, IntegrationFlow subFlow) {
return recipientFlow(selector, subFlow);
}
/**
* Adds a subflow that will be invoked if the selector's accept methods returns 'true'.
* @param selector the selector.
* @param subFlow the subflow.
* @param <P> the selector source type.
* @return the router spec.
*/
public <P> RecipientListRouterSpec recipientFlow(GenericSelector<P> selector, IntegrationFlow subFlow) {
Assert.notNull(subFlow, "'subFlow' must not be null");
DirectChannel channel = populateSubFlow(subFlow);
return recipient(channel, selector);
}
/**
* Adds a subflow that will be invoked as a recipient.
* @param subFlow the subflow.
* @return the router spec.
* @since 1.2
*/
public RecipientListRouterSpec recipientFlow(IntegrationFlow subFlow) {
return recipientFlow((String) null, subFlow);
}
/**
* Adds a subflow that will be invoked if the expression evaluates to 'true'.
* @param expression the expression.
* @param subFlow the subflow.
* @return the router spec.
*/
public RecipientListRouterSpec recipientFlow(String expression, IntegrationFlow subFlow) {
return recipientFlow(StringUtils.hasText(expression) ? PARSER.parseExpression(expression) : null, subFlow);
}
/**
* Adds a subflow that will be invoked if the expression evaluates to 'true'.
* @param expression the expression.
* @param subFlow the subflow.
* @return the router spec.
* @since 1.2
*/
public RecipientListRouterSpec recipientFlow(Expression expression, IntegrationFlow subFlow) {
Assert.notNull(subFlow, "'subFlow' must not be null");
DirectChannel channel = populateSubFlow(subFlow);
return recipient(channel, expression);
}
private DirectChannel populateSubFlow(IntegrationFlow subFlow) {
DirectChannel channel = new DirectChannel();
IntegrationFlowBuilder flowBuilder = IntegrationFlows.from(channel);
subFlow.configure(flowBuilder);
this.componentsToRegister.add(flowBuilder.get());
return channel;
}
}