INT-3661: Fix the eager BF access from BPPs (P I)

JIRA: https://jira.spring.io/browse/INT-3661

Previously there were a lot of noise from the `PostProcessorRegistrationDelegate$BeanPostProcessorChecker` for early access for beans.
That may produce some side-effects when some of `BeanFactoryPostProcessor`s won't adjust those beans.

The issue is based on two facts:
1. Loading beans from `BPP`, e.g. `IntegrationEvaluationContextAwareBeanPostProcessor` (or `ChannelSecurityInterceptorBeanPostProcessor` - https://jira.spring.io/browse/INT-3663)
2. Loading beans from `setBeanFactory()/setApplicationContext()` container methods

* Move all code from `setBeanFactory()` with access to the `BeanFactory` (e.g. `this.messageBuilderFactory = IntegrationUtils.getMessageBuilderFactory(this.beanFactory);`)
to some other lazy-load methods like `getMessageBuilderFactory()`
* Fix parser tests to remove `messageBuilderFactory` tests since there is no activity for target components to lazy-load them
* Polish some test according the new lazy-load logic
* Rework `IntegrationEvaluationContextAwareBeanPostProcessor` to the `SmartInitializingSingleton` and make it `Ordered`
* Populate `beanFactory` for the internal instance of `connectionFactory` in the `TcpSyslogReceivingChannelAdapter`
* Populate `beanFactory` for the internal `UnicastReceivingChannelAdapter` in the `UdpSyslogReceivingChannelAdapter`
* Add `log.info` that `UdpSyslogReceivingChannelAdapter` overrides `outputChannel` for the provided `UnicastReceivingChannelAdapter`
* Change the internal `MessageChannel` in the `UdpSyslogReceivingChannelAdapter` to the `FixedSubscriberChannel` for better performance

* Fix `AbstractExpressionEvaluator`
* Add JavaDocs for the `IntegrationEvaluationContextAware`

Fix `MongoDbMessageStoreClaimCheckIntegrationTests`

Addressing PR comments

spring-integration-syslog/src/main/java/org/springframework/integration/syslog/DefaultMessageConverter.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2014 the original author or authors.
+ * Copyright 2002-2015 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.
@@ -49,8 +49,12 @@ public class DefaultMessageConverter implements MessageConverter, BeanFactoryAwa
 
 	private volatile MessageBuilderFactory messageBuilderFactory = new DefaultMessageBuilderFactory();
 
+	private volatile boolean messageBuilderFactorySet;
+
 	private volatile boolean asMap = true;
 
+	private BeanFactory beanFactory;
+
 	/**
 	 * Set false will leave the payload as the original complete syslog.
 	 * @param asMap boolean flag.
@@ -65,11 +69,17 @@ public class DefaultMessageConverter implements MessageConverter, BeanFactoryAwa
 
 	@Override
 	public final void setBeanFactory(BeanFactory beanFactory) {
-		this.messageBuilderFactory = IntegrationUtils.getMessageBuilderFactory(beanFactory);
+		this.beanFactory = beanFactory;
 	}
 
 	protected MessageBuilderFactory getMessageBuilderFactory() {
-		return messageBuilderFactory;
+		if (!this.messageBuilderFactorySet) {
+			if (this.beanFactory != null) {
+				this.messageBuilderFactory = IntegrationUtils.getMessageBuilderFactory(this.beanFactory);
+			}
+			this.messageBuilderFactorySet = true;
+		}
+		return this.messageBuilderFactory;
 	}
 
 	@Override
@@ -82,7 +92,7 @@ public class DefaultMessageConverter implements MessageConverter, BeanFactoryAwa
 				out.put(SyslogHeaders.PREFIX + entry.getKey(), entry.getValue());
 			}
 		}
-		return this.messageBuilderFactory.withPayload(this.asMap ? map : message.getPayload())
+		return getMessageBuilderFactory().withPayload(this.asMap ? map : message.getPayload())
 				.copyHeaders(out)
 				.build();
 	}

spring-integration-syslog/src/main/java/org/springframework/integration/syslog/inbound/TcpSyslogReceivingChannelAdapter.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2014 the original author or authors.
+ * Copyright 2002-2015 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.
@@ -13,6 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+
 package org.springframework.integration.syslog.inbound;
 
 
@@ -28,6 +29,7 @@ import org.springframework.messaging.Message;
  * TCP implementation of a syslog inbound channel adapter.
  *
  * @author Gary Russell
+ * @author Artem Bilan
  * @since 3.0
  *
  */
@@ -61,9 +63,11 @@ public class TcpSyslogReceivingChannelAdapter extends SyslogReceivingChannelAdap
 		if (this.connectionFactory == null) {
 			this.connectionFactory = new TcpNioServerConnectionFactory(this.getPort());
 			this.connectionFactory.setDeserializer(new ByteArrayLfSerializer());
+			this.connectionFactory.setBeanFactory(getBeanFactory());
 			if (this.applicationEventPublisher != null) {
 				this.connectionFactory.setApplicationEventPublisher(this.applicationEventPublisher);
 			}
+			this.connectionFactory.afterPropertiesSet();
 		}
 		this.connectionFactory.registerListener(this);
 	}

spring-integration-syslog/src/main/java/org/springframework/integration/syslog/inbound/UdpSyslogReceivingChannelAdapter.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2013 the original author or authors.
+ * Copyright 2002-2015 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.
@@ -13,9 +13,10 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+
 package org.springframework.integration.syslog.inbound;
 
-import org.springframework.integration.channel.DirectChannel;
+import org.springframework.integration.channel.FixedSubscriberChannel;
 import org.springframework.integration.ip.udp.UnicastReceivingChannelAdapter;
 import org.springframework.messaging.Message;
 import org.springframework.messaging.MessageHandler;
@@ -25,6 +26,7 @@ import org.springframework.messaging.MessagingException;
  * UDP implementation of a syslog inbound channel adapter.
  *
  * @author Gary Russell
+ * @author Artem Bilan
  * @since 3.0
  *
  */
@@ -32,8 +34,11 @@ public class UdpSyslogReceivingChannelAdapter extends SyslogReceivingChannelAdap
 
 	private volatile UnicastReceivingChannelAdapter udpAdapter;
 
+	private volatile boolean udpAdapterSet;
+
 	public void setUdpAdapter(UnicastReceivingChannelAdapter udpAdpter) {
 		this.udpAdapter = udpAdpter;
+		this.udpAdapterSet = true;
 	}
 
 	@Override
@@ -43,18 +48,27 @@ public class UdpSyslogReceivingChannelAdapter extends SyslogReceivingChannelAdap
 
 	@Override
 	protected void onInit() {
+		super.onInit();
 		if (this.udpAdapter == null) {
 			this.udpAdapter = new UnicastReceivingChannelAdapter(this.getPort());
+			this.udpAdapter.setBeanFactory(getBeanFactory());
 		}
-		DirectChannel outputChannel = new DirectChannel();
-		outputChannel.subscribe(new MessageHandler() {
+		else {
+			logger.info("The 'UdpSyslogReceivingChannelAdapter' overrides an 'outputChannel' " +
+					"of the provided 'UnicastReceivingChannelAdapter' to support Syslog conversion " +
+					"for the incoming UDP packets");
+		}
+		this.udpAdapter.setOutputChannel(new FixedSubscriberChannel(new MessageHandler() {
 
 			@Override
 			public void handleMessage(Message<?> message) throws MessagingException {
 				convertAndSend(message);
 			}
-		});
-		this.udpAdapter.setOutputChannel(outputChannel);
+
+		}));
+		if (!this.udpAdapterSet) {
+			this.udpAdapter.afterPropertiesSet();
+		}
 	}
 
 	@Override