Expose Spring Integration global properties

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/integration/IntegrationAutoConfiguration.java

@@ -80,6 +80,23 @@
 		TaskSchedulingAutoConfiguration.class })
 public class IntegrationAutoConfiguration {
 
+	@Bean(name = IntegrationContextUtils.INTEGRATION_GLOBAL_PROPERTIES_BEAN_NAME)
+	@ConditionalOnMissingBean(name = IntegrationContextUtils.INTEGRATION_GLOBAL_PROPERTIES_BEAN_NAME)
+	public static org.springframework.integration.context.IntegrationProperties integrationGlobalProperties(
+			IntegrationProperties properties) {
+		org.springframework.integration.context.IntegrationProperties integrationProperties = new org.springframework.integration.context.IntegrationProperties();
+		integrationProperties.setChannelsAutoCreate(properties.getChannels().isAutoCreate());
+		integrationProperties.setChannelsMaxUnicastSubscribers(properties.getChannels().getMaxUnicastSubscribers());
+		integrationProperties.setChannelsMaxBroadcastSubscribers(properties.getChannels().getMaxBroadcastSubscribers());
+		integrationProperties.setErrorChannelRequireSubscribers(properties.getChannels().isErrorRequireSubscribers());
+		integrationProperties.setErrorChannelIgnoreFailures(properties.getChannels().isErrorIgnoreFailures());
+		integrationProperties
+				.setMessagingTemplateThrowExceptionOnLateReply(properties.getEndpoints().isThrowExceptionOnLateReply());
+		integrationProperties.setReadOnlyHeaders(properties.getEndpoints().getReadOnlyHeaders());
+		integrationProperties.setNoAutoStartupEndpoints(properties.getEndpoints().getNoAutoStartup());
+		return integrationProperties;
+	}
+
 	/**
 	 * Basic Spring Integration configuration.
 	 */

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/integration/IntegrationEnvironmentPostProcessor.java

@@ -0,0 +1,115 @@
+/*
+ * Copyright 2012-2021 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
+ *
+ *      https://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.boot.autoconfigure.integration;
+
+import java.io.FileNotFoundException;
+import java.io.IOException;
+import java.util.HashMap;
+import java.util.Map;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.env.EnvironmentPostProcessor;
+import org.springframework.boot.env.OriginTrackedMapPropertySource;
+import org.springframework.boot.env.PropertiesPropertySourceLoader;
+import org.springframework.boot.origin.Origin;
+import org.springframework.boot.origin.OriginLookup;
+import org.springframework.core.Ordered;
+import org.springframework.core.env.ConfigurableEnvironment;
+import org.springframework.core.env.PropertySource;
+import org.springframework.core.io.ClassPathResource;
+import org.springframework.core.io.Resource;
+import org.springframework.integration.context.IntegrationProperties;
+
+/**
+ * The {@link EnvironmentPostProcessor} for Spring Integration.
+ *
+ * @author Artem Bilan
+ * @since 2.5
+ */
+public class IntegrationEnvironmentPostProcessor implements EnvironmentPostProcessor, Ordered {
+
+	@Override
+	public int getOrder() {
+		return Ordered.LOWEST_PRECEDENCE;
+	}
+
+	@Override
+	public void postProcessEnvironment(ConfigurableEnvironment environment, SpringApplication application) {
+		registerIntegrationPropertiesFileSource(environment);
+	}
+
+	private static void registerIntegrationPropertiesFileSource(ConfigurableEnvironment environment) {
+		Resource integrationPropertiesResource = new ClassPathResource("META-INF/spring.integration.properties");
+		PropertiesPropertySourceLoader loader = new PropertiesPropertySourceLoader();
+		try {
+			OriginTrackedMapPropertySource propertyFileSource = (OriginTrackedMapPropertySource) loader
+					.load("integration-properties-file", integrationPropertiesResource).get(0);
+
+			environment.getPropertySources().addLast(new IntegrationPropertySource(propertyFileSource));
+		}
+		catch (FileNotFoundException ex) {
+			// Ignore when no META-INF/spring.integration.properties file in classpath
+		}
+		catch (IOException ex) {
+			throw new IllegalStateException(
+					"Failed to load integration properties from " + integrationPropertiesResource, ex);
+		}
+	}
+
+	private static final class IntegrationPropertySource extends PropertySource<Map<String, Object>>
+			implements OriginLookup<String> {
+
+		private static final String PREFIX = "spring.integration.";
+
+		private static final Map<String, String> KEYS_MAPPING = new HashMap<>();
+
+		static {
+			KEYS_MAPPING.put(PREFIX + "channels.auto-create", IntegrationProperties.CHANNELS_AUTOCREATE);
+			KEYS_MAPPING.put(PREFIX + "channels.max-unicast-subscribers",
+					IntegrationProperties.CHANNELS_MAX_UNICAST_SUBSCRIBERS);
+			KEYS_MAPPING.put(PREFIX + "channels.max-broadcast-subscribers",
+					IntegrationProperties.CHANNELS_MAX_BROADCAST_SUBSCRIBERS);
+			KEYS_MAPPING.put(PREFIX + "channels.error-require-subscribers",
+					IntegrationProperties.ERROR_CHANNEL_REQUIRE_SUBSCRIBERS);
+			KEYS_MAPPING.put(PREFIX + "channels.error-ignore-failures",
+					IntegrationProperties.ERROR_CHANNEL_IGNORE_FAILURES);
+			KEYS_MAPPING.put(PREFIX + "endpoints.throw-exception-on-late-reply",
+					IntegrationProperties.THROW_EXCEPTION_ON_LATE_REPLY);
+			KEYS_MAPPING.put(PREFIX + "endpoints.read-only-headers", IntegrationProperties.READ_ONLY_HEADERS);
+			KEYS_MAPPING.put(PREFIX + "endpoints.no-auto-startup", IntegrationProperties.ENDPOINTS_NO_AUTO_STARTUP);
+		}
+
+		private final OriginTrackedMapPropertySource origin;
+
+		IntegrationPropertySource(OriginTrackedMapPropertySource origin) {
+			super("original-integration-properties", origin.getSource());
+			this.origin = origin;
+		}
+
+		@Override
+		public Object getProperty(String name) {
+			return this.origin.getProperty(KEYS_MAPPING.get(name));
+		}
+
+		@Override
+		public Origin getOrigin(String key) {
+			return this.origin.getOrigin(KEYS_MAPPING.get(name));
+		}
+
+	}
+
+}

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/integration/IntegrationProperties.java

@@ -32,10 +32,22 @@
 @ConfigurationProperties(prefix = "spring.integration")
 public class IntegrationProperties {
 
+	private final Channels channels = new Channels();
+
+	private final Endpoints endpoints = new Endpoints();
+
 	private final Jdbc jdbc = new Jdbc();
 
 	private final RSocket rsocket = new RSocket();
 
+	public Channels getChannels() {
+		return this.channels;
+	}
+
+	public Endpoints getEndpoints() {
+		return this.endpoints;
+	}
+
 	public Jdbc getJdbc() {
 		return this.jdbc;
 	}
@@ -44,6 +56,118 @@ public RSocket getRsocket() {
 		return this.rsocket;
 	}
 
+	public static class Channels {
+
+		/**
+		 * Whether to create input channels when no respective beans.
+		 */
+		private boolean autoCreate = true;
+
+		/**
+		 * Default number of max subscribers on unicasting channels.
+		 */
+		private int maxUnicastSubscribers = Integer.MAX_VALUE;
+
+		/**
+		 * Default number of max subscribers on broadcasting channels.
+		 */
+		private int maxBroadcastSubscribers = Integer.MAX_VALUE;
+
+		/**
+		 * Require subscribers flag for global 'errorChannel'.
+		 */
+		private boolean errorRequireSubscribers = true;
+
+		/**
+		 * Ignore failures flag for global 'errorChannel'.
+		 */
+		private boolean errorIgnoreFailures = true;
+
+		public void setAutoCreate(boolean autoCreate) {
+			this.autoCreate = autoCreate;
+		}
+
+		public boolean isAutoCreate() {
+			return this.autoCreate;
+		}
+
+		public void setMaxUnicastSubscribers(int maxUnicastSubscribers) {
+			this.maxUnicastSubscribers = maxUnicastSubscribers;
+		}
+
+		public int getMaxUnicastSubscribers() {
+			return this.maxUnicastSubscribers;
+		}
+
+		public void setMaxBroadcastSubscribers(int maxBroadcastSubscribers) {
+			this.maxBroadcastSubscribers = maxBroadcastSubscribers;
+		}
+
+		public int getMaxBroadcastSubscribers() {
+			return this.maxBroadcastSubscribers;
+		}
+
+		public void setErrorRequireSubscribers(boolean errorRequireSubscribers) {
+			this.errorRequireSubscribers = errorRequireSubscribers;
+		}
+
+		public boolean isErrorRequireSubscribers() {
+			return this.errorRequireSubscribers;
+		}
+
+		public void setErrorIgnoreFailures(boolean errorIgnoreFailures) {
+			this.errorIgnoreFailures = errorIgnoreFailures;
+		}
+
+		public boolean isErrorIgnoreFailures() {
+			return this.errorIgnoreFailures;
+		}
+
+	}
+
+	public static class Endpoints {
+
+		/**
+		 * Whether throw an exception on late reply for gateways.
+		 */
+		private boolean throwExceptionOnLateReply = false;
+
+		/**
+		 * Ignored headers during message building.
+		 */
+		private String[] readOnlyHeaders = {};
+
+		/**
+		 * Spring Integration endpoints do not start automatically.
+		 */
+		private String[] noAutoStartup = {};
+
+		public void setThrowExceptionOnLateReply(boolean throwExceptionOnLateReply) {
+			this.throwExceptionOnLateReply = throwExceptionOnLateReply;
+		}
+
+		public boolean isThrowExceptionOnLateReply() {
+			return this.throwExceptionOnLateReply;
+		}
+
+		public void setReadOnlyHeaders(String[] readOnlyHeaders) {
+			this.readOnlyHeaders = readOnlyHeaders;
+		}
+
+		public String[] getReadOnlyHeaders() {
+			return this.readOnlyHeaders;
+		}
+
+		public void setNoAutoStartup(String[] noAutoStartup) {
+			this.noAutoStartup = noAutoStartup;
+		}
+
+		public String[] getNoAutoStartup() {
+			return this.noAutoStartup;
+		}
+
+	}
+
 	public static class Jdbc {
 
 		private static final String DEFAULT_SCHEMA_LOCATION = "classpath:org/springframework/"
@@ -139,7 +263,7 @@ public static class Server {
 			/**
 			 * Whether to handle message mapping for RSocket via Spring Integration.
 			 */
-			boolean messageMappingEnabled;
+			private boolean messageMappingEnabled;
 
 			public boolean isMessageMappingEnabled() {
 				return this.messageMappingEnabled;

spring-boot-project/spring-boot-autoconfigure/src/main/resources/META-INF/spring.factories

@@ -7,6 +7,10 @@ org.springframework.boot.autoconfigure.logging.ConditionEvaluationReportLoggingL
 org.springframework.context.ApplicationListener=\
 org.springframework.boot.autoconfigure.BackgroundPreinitializer
 
+# Environment Post Processors
+org.springframework.boot.env.EnvironmentPostProcessor=\
+org.springframework.boot.autoconfigure.integration.IntegrationEnvironmentPostProcessor
+
 # Auto Configuration Import Listeners
 org.springframework.boot.autoconfigure.AutoConfigurationImportListener=\
 org.springframework.boot.autoconfigure.condition.ConditionEvaluationReportAutoConfigurationImportListener