GH-2602 Follow up to the previous commit

core/spring-cloud-stream/src/main/java/org/springframework/cloud/stream/function/PollableSourceInitializer.java

@@ -0,0 +1,51 @@
+/*
+ * Copyright 2020-2021 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.cloud.stream.function;
+
+import org.springframework.cloud.stream.binding.SupportedBindableFeatures;
+import org.springframework.context.ApplicationContextInitializer;
+import org.springframework.context.support.GenericApplicationContext;
+import org.springframework.core.env.Environment;
+import org.springframework.util.StringUtils;
+
+/**
+ *
+ * @author Oleg Zhurakousky
+ * @since 4.0.1
+ *
+ */
+public class PollableSourceInitializer implements ApplicationContextInitializer<GenericApplicationContext> {
+
+	@Override
+	public void initialize(GenericApplicationContext applicationContext) {
+		Environment environment = applicationContext.getEnvironment();
+		if (StringUtils.hasText(environment.getProperty("spring.cloud.stream.pollable-source"))) {
+			String[] sourceNames = environment.getProperty("spring.cloud.stream.pollable-source").split(";");
+
+			for (String sourceName : sourceNames) {
+				final SupportedBindableFeatures supportedBindableFeatures = new SupportedBindableFeatures();
+				supportedBindableFeatures.setPollable(true);
+				supportedBindableFeatures.setReactive(false);
+
+				BindableFunctionProxyFactory proxyFactory =
+					new BindableFunctionProxyFactory(sourceName, 1, 0, new StreamFunctionProperties(), supportedBindableFeatures);
+				applicationContext.registerBean(sourceName + "_binding", BindableFunctionProxyFactory.class, () -> proxyFactory);
+			}
+		}
+	}
+
+}