GH-10083: Apply Nullability to some core support packages

Related to: #10083

This commit applies Nullability to `support.channel`, `support.context` and `support.converter` packages

Implement `#getComponentType`

Signed-off-by: Tran Ngoc Nhan <[email protected]>

Author: ngocnhan-tran1996

spring-integration-core/src/main/java/org/springframework/integration/channel/DefaultHeaderChannelRegistry.java

@@ -259,6 +259,11 @@ public void run() {
 		}
 	}
 
+	@Override
+	public String getComponentType() {
+		return "header-channel-registry";
+	}
+
 	protected record MessageChannelWrapper(MessageChannel channel, long expireAt) {
 
 	}

spring-integration-core/src/main/java/org/springframework/integration/codec/CodecMessageConverter.java

@@ -77,4 +77,9 @@ public Message<?> toMessage(Object payload, @Nullable MessageHeaders headers) {
 		}
 	}
 
+	@Override
+	public String getComponentType() {
+		return "converter";
+	}
+
 }

spring-integration-core/src/main/java/org/springframework/integration/context/IntegrationObjectSupport.java

@@ -138,15 +138,6 @@ public void setComponentName(String componentName) {
 		this.componentName = componentName;
 	}
 
-	/**
-	 * Subclasses may implement this method to provide component type information.
-	 */
-	@Override
-	@Nullable
-	public String getComponentType() {
-		return null;
-	}
-
 	@Override
 	public void setComponentSource(Object source) {
 		this.beanSource = source;

spring-integration-core/src/main/java/org/springframework/integration/dsl/RouterSpec.java

@@ -278,6 +278,11 @@ else if (conversionService.canConvert(key.getClass(), String.class)) {
 			}
 		}
 
+		@Override
+		public String getComponentType() {
+			return "router-mapping-provider";
+		}
+
 	}
 
 }

spring-integration-core/src/main/java/org/springframework/integration/endpoint/EventDrivenConsumer.java

@@ -79,6 +79,11 @@ public MessageHandler getHandler() {
 		return this.handler;
 	}
 
+	@Override
+	public String getComponentType() {
+		return "event-driven-consumer";
+	}
+
 	@Override
 	protected void doStart() {
 		this.logComponentSubscriptionEvent(true);

spring-integration-core/src/main/java/org/springframework/integration/endpoint/MessageProducerSupport.java

@@ -111,6 +111,11 @@ public void setOutputChannelName(String outputChannelName) {
 		return this.outputChannel;
 	}
 
+	@Override
+	public String getComponentType() {
+		return "message-producer";
+	}
+
 	public void setErrorChannel(MessageChannel errorChannel) {
 		this.errorChannel = errorChannel;
 	}

spring-integration-core/src/main/java/org/springframework/integration/endpoint/PollingConsumer.java

@@ -126,6 +126,11 @@ protected boolean isReactive() {
 				this.handler instanceof Subscriber;
 	}
 
+	@Override
+	public String getComponentType() {
+		return "polling-consumer";
+	}
+
 	@Override
 	protected void doStart() {
 		if (this.handler instanceof Lifecycle lifecycle) {

spring-integration-core/src/main/java/org/springframework/integration/endpoint/ReactiveStreamsConsumer.java

@@ -163,6 +163,11 @@ public MessageHandler getHandler() {
 		return this.handler;
 	}
 
+	@Override
+	public String getComponentType() {
+		return "reactive-streams-consumer";
+	}
+
 	@Override
 	protected void onInit() {
 		super.onInit();

spring-integration-core/src/main/java/org/springframework/integration/gateway/GatewayProxyFactoryBean.java

@@ -1055,6 +1055,11 @@ public void destroy() {
 		this.gatewayMap.values().forEach(MethodInvocationGateway::destroy);
 	}
 
+	@Override
+	public String getComponentType() {
+		return "gateway-proxy-factory";
+	}
+
 	private static final class MethodInvocationGateway extends MessagingGatewaySupport {
 
 		private Expression receiveTimeoutExpression;

spring-integration-core/src/main/java/org/springframework/integration/handler/advice/AbstractRequestHandlerAdvice.java

@@ -73,6 +73,11 @@ public final Object invoke(final MethodInvocation invocation) throws Throwable {
 		}
 	}
 
+	@Override
+	public String getComponentType() {
+		return "advice";
+	}
+
 	/**
 	 * Subclasses implement this method to apply behavior to the {@link MessageHandler}.
 	 * <p>