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GH-3280: NullChannel as reply for void gateways (#3292)

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* GH-3280: NullChannel as reply for void gateways

Fixes https://github.com/spring-projects/spring-integration/issues/3280

To properly support a one-way gateway (`void` return type), it is
better to ignore any possible replies from downstream instead of
unexpected `no output-channel or replyChannel header available`
error

* Populate a `nullChannel` into a `replyChannel` header
for `void` gateway methods when `replyChannel` is not set explicitly
* Remove redundant `GatewayProxyFactoryBean.PARSER` in favor of
similar `EXPRESSION_PARSER` in the super class
* Test and document the feature

* * Fix language in the `whats-new.adoc`

Co-authored-by: Gary Russell <grussell@vmware.com>

* * Fix language in gateway.adoc

Co-authored-by: Gary Russell <grussell@vmware.com>

Co-authored-by: Gary Russell <grussell@vmware.com>
This commit is contained in:
Artem Bilan
2020-05-27 16:10:05 -04:00
committed by GitHub
parent e98169146b
commit b8e2dfe4e1
4 changed files with 59 additions and 12 deletions
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29
spring-integration-core/src/main/java/org/springframework/integration/gateway/GatewayProxyFactoryBean.java
View File

@@ -54,11 +54,11 @@ import org.springframework.core.task.support.TaskExecutorAdapter;
import org.springframework.expression.EvaluationContext;
import org.springframework.expression.Expression;
import org.springframework.expression.common.LiteralExpression;
import org.springframework.expression.spel.standard.SpelExpressionParser;
import org.springframework.expression.spel.support.StandardEvaluationContext;
import org.springframework.integration.IntegrationPatternType;
import org.springframework.integration.annotation.Gateway;
import org.springframework.integration.annotation.GatewayHeader;
import org.springframework.integration.context.IntegrationContextUtils;
import org.springframework.integration.endpoint.AbstractEndpoint;
import org.springframework.integration.expression.ExpressionUtils;
import org.springframework.integration.expression.ValueExpression;
@@ -103,8 +103,6 @@ import reactor.core.publisher.Mono;
public class GatewayProxyFactoryBean extends AbstractEndpoint
implements TrackableComponent, FactoryBean<Object>, MethodInterceptor, BeanClassLoaderAware {
private static final SpelExpressionParser PARSER = new SpelExpressionParser();
private final Object initializationMonitor = new Object();
private final Map<Method, MethodInvocationGateway> gatewayMap = new HashMap<>();
@@ -718,7 +716,7 @@ public class GatewayProxyFactoryBean extends AbstractEndpoint
* no longer work as expected; they will need to use, say, -1 instead.
*/
if (payloadExpression == null && StringUtils.hasText(gatewayAnnotation.payloadExpression())) {
payloadExpression = PARSER.parseExpression(gatewayAnnotation.payloadExpression());
payloadExpression = EXPRESSION_PARSER.parseExpression(gatewayAnnotation.payloadExpression());
}
}
else if (methodMetadata != null && methodMetadata.getPayloadExpression() != null) {
@@ -880,11 +878,24 @@ public class GatewayProxyFactoryBean extends AbstractEndpoint
Map<String, Object> headers = null;
// We don't want to eagerly resolve the error channel here
Object errorChannelForVoidReturn = this.errorChannel == null ? this.errorChannelName : this.errorChannel;
if (errorChannelForVoidReturn != null && method.getReturnType().equals(void.class)) {
boolean isVoidReturnType = method.getReturnType().equals(void.class);
if (errorChannelForVoidReturn != null && isVoidReturnType) {
headers = new HashMap<>();
headers.put(MessageHeaders.ERROR_CHANNEL, errorChannelForVoidReturn);
}
if (isVoidReturnType &&
(!headerExpressions.containsKey(MessageHeaders.REPLY_CHANNEL) ||
(this.globalMethodMetadata != null &&
!this.globalMethodMetadata.getHeaderExpressions()
.containsKey(MessageHeaders.REPLY_CHANNEL)))) {
if (headers == null) {
headers = new HashMap<>();
}
headers.put(MessageHeaders.REPLY_CHANNEL, IntegrationContextUtils.NULL_CHANNEL_BEAN_NAME);
}
if (getMessageBuilderFactory() instanceof DefaultMessageBuilderFactory) {
Set<String> headerNames = new HashSet<>(headerExpressions.keySet());
@@ -987,16 +998,12 @@ public class GatewayProxyFactoryBean extends AbstractEndpoint
@Override // guarded by super#lifecycleLock
protected void doStart() {
for (MethodInvocationGateway gateway : this.gatewayMap.values()) {
gateway.start();
}
this.gatewayMap.values().forEach(MethodInvocationGateway::start);
}
@Override // guarded by super#lifecycleLock
protected void doStop() {
for (MethodInvocationGateway gateway : this.gatewayMap.values()) {
gateway.stop();
}
this.gatewayMap.values().forEach(MethodInvocationGateway::stop);
}
@SuppressWarnings("unchecked")