Fix receiveOnlyAdviceChain condition

https://build.spring.io/browse/INT-MASTER-415/

The `Stream` `Collectors.toList()` returns empty list if nothing pass the `.filter()`, therefore condition as `if (receiveOnlyAdviceChain != null)` is not enough
and since `SourcePollingChannelAdapter.applyReceiveOnlyAdviceChain()` doesn't have conditions as well, the target `MessageSource` is proxyed for nothing.
When `TransactionSynchronizationManager.getResource(this)` is called for the `MessageSource` it can't find it because the proxy doesn't match an original object.

* Make condition as `if (!CollectionUtils.isEmpty(receiveOnlyAdviceChain))` in the `AbstractPollingEndpoint` and `SourcePollingChannelAdapter`
* Increase group removal wait timeout in the `gemfire.DelayerHandlerRescheduleIntegrationTests`

Author: artembilan

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

@@ -193,7 +193,7 @@ private Runnable createPoller() throws Exception {
 			}
 			pollingTask = (Callable<Boolean>) proxyFactory.getProxy(this.beanClassLoader);
 		}
-		if (receiveOnlyAdviceChain != null) {
+		if (!CollectionUtils.isEmpty(receiveOnlyAdviceChain)) {
 			applyReceiveOnlyAdviceChain(receiveOnlyAdviceChain);
 		}
 		return new Poller(pollingTask);

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

@@ -38,6 +38,7 @@
 import org.springframework.messaging.MessageChannel;
 import org.springframework.messaging.MessagingException;
 import org.springframework.util.Assert;
+import org.springframework.util.CollectionUtils;
 
 /**
  * A Channel Adapter implementation for connecting a
@@ -131,22 +132,24 @@ protected boolean isReceiveOnlyAdvice(Advice advice) {
 
 	@Override
 	protected void applyReceiveOnlyAdviceChain(Collection<Advice> chain) {
-		if (AopUtils.isAopProxy(this.source)) {
-			Advised source = (Advised) this.source;
-			this.appliedAdvices.forEach(source::removeAdvice);
-			for (Advice advice : chain) {
-				source.addAdvisor(adviceToReceiveAdvisor(advice));
+		if (!CollectionUtils.isEmpty(chain)) {
+			if (AopUtils.isAopProxy(this.source)) {
+				Advised source = (Advised) this.source;
+				this.appliedAdvices.forEach(source::removeAdvice);
+				for (Advice advice : chain) {
+					source.addAdvisor(adviceToReceiveAdvisor(advice));
+				}
 			}
-		}
-		else {
-			ProxyFactory proxyFactory = new ProxyFactory(this.source);
-			for (Advice advice : chain) {
-				proxyFactory.addAdvisor(adviceToReceiveAdvisor(advice));
+			else {
+				ProxyFactory proxyFactory = new ProxyFactory(this.source);
+				for (Advice advice : chain) {
+					proxyFactory.addAdvisor(adviceToReceiveAdvisor(advice));
+				}
+				this.source = (MessageSource<?>) proxyFactory.getProxy(getBeanClassLoader());
 			}
-			this.source = (MessageSource<?>) proxyFactory.getProxy(getBeanClassLoader());
+			this.appliedAdvices.clear();
+			this.appliedAdvices.addAll(chain);
 		}
-		this.appliedAdvices.clear();
-		this.appliedAdvices.addAll(chain);
 	}
 
 	private NameMatchMethodPointcutAdvisor adviceToReceiveAdvisor(Advice advice) {

spring-integration-gemfire/src/test/java/org/springframework/integration/gemfire/store/DelayerHandlerRescheduleIntegrationTests.java

@@ -140,7 +140,7 @@ public void testDelayerHandlerRescheduleWithGemfireMessageStore() throws Excepti
 		assertEquals(1, messageStore.getMessageGroupCount());
 		int n = 0;
 		while (n++ < 200 && messageStore.messageGroupSize(delayerMessageGroupId) > 0) {
-			Thread.sleep(50);
+			Thread.sleep(100);
 		}
 		assertEquals(0, messageStore.messageGroupSize(delayerMessageGroupId));