INT-3749: Get rid of IECA logic

JIRA: https://jira.spring.io/browse/INT-3749

Since `IntegrationEvaluationContextAware` isn't so "context-free" resource like `BeanFactory`
 and `ApplicationContext`, but just a specific bean in the context, we can't follow with `BeanPostProcessor` logic - bad architecture by level of responsibility.
 Therefore we should follow with standard Dependency Injection mechanism to retrieve `evaluationContext` for the particular component.

 Since we can't rely on the `@Autowired` because SI can be used from the raw XML configuration,
 we use utility method instead. The pattern to get the proper `integrationEvaluationContext` is:
 ```
 @Override
 protected void onInit() throws Exception {
 		super.onInit();
 		this.evaluationContext = ExpressionUtils.createStandardEvaluationContext(getBeanFactory());
 }
 ```

spring-integration-redis/src/main/java/org/springframework/integration/redis/outbound/ExpressionArgumentsStrategy.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2014 the original author or authors.
+ * Copyright 2014-2015 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.
@@ -23,11 +23,12 @@ import java.util.List;
 import org.springframework.beans.BeansException;
 import org.springframework.beans.factory.BeanFactory;
 import org.springframework.beans.factory.BeanFactoryAware;
+import org.springframework.beans.factory.InitializingBean;
 import org.springframework.expression.EvaluationContext;
 import org.springframework.expression.Expression;
 import org.springframework.expression.spel.standard.SpelExpressionParser;
 import org.springframework.integration.context.IntegrationContextUtils;
-import org.springframework.integration.expression.IntegrationEvaluationContextAware;
+import org.springframework.integration.expression.ExpressionUtils;
 import org.springframework.messaging.Message;
 import org.springframework.util.Assert;
 
@@ -35,7 +36,7 @@ import org.springframework.util.Assert;
  * @author Artem Bilan
  * @since 4.0
  */
-public class ExpressionArgumentsStrategy implements ArgumentsStrategy, IntegrationEvaluationContextAware, BeanFactoryAware {
+public class ExpressionArgumentsStrategy implements ArgumentsStrategy, BeanFactoryAware, InitializingBean {
 
 	private static final SpelExpressionParser PARSER = new SpelExpressionParser();
 
@@ -63,14 +64,13 @@ public class ExpressionArgumentsStrategy implements ArgumentsStrategy, Integrati
 	}
 
 	@Override
-	public void setIntegrationEvaluationContext(EvaluationContext evaluationContext) {
-		Assert.notNull(evaluationContext, "'evaluationContext' must not be null");
-		this.evaluationContext = evaluationContext;
+	public void setBeanFactory(BeanFactory beanFactory) throws BeansException {
+		this.beanFactory = beanFactory;
 	}
 
 	@Override
-	public void setBeanFactory(BeanFactory beanFactory) throws BeansException {
-		this.beanFactory = beanFactory;
+	public void afterPropertiesSet() throws Exception {
+		this.evaluationContext = ExpressionUtils.createStandardEvaluationContext(this.beanFactory);
 	}
 
 	@Override

spring-integration-redis/src/main/java/org/springframework/integration/redis/outbound/RedisOutboundGateway.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2014 the original author or authors.
+ * Copyright 2014-2015 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.
@@ -26,7 +26,7 @@ import org.springframework.data.redis.serializer.RedisSerializer;
 import org.springframework.expression.EvaluationContext;
 import org.springframework.expression.Expression;
 import org.springframework.expression.spel.standard.SpelExpressionParser;
-import org.springframework.integration.expression.IntegrationEvaluationContextAware;
+import org.springframework.integration.expression.ExpressionUtils;
 import org.springframework.integration.handler.AbstractReplyProducingMessageHandler;
 import org.springframework.integration.redis.support.RedisHeaders;
 import org.springframework.messaging.Message;
@@ -39,8 +39,7 @@ import org.springframework.util.ObjectUtils;
  * @author Artem Bilan
  * @since 4.0
  */
-public class RedisOutboundGateway extends AbstractReplyProducingMessageHandler
-		implements IntegrationEvaluationContextAware {
+public class RedisOutboundGateway extends AbstractReplyProducingMessageHandler {
 
 	private static final SpelExpressionParser PARSER = new SpelExpressionParser();
 
@@ -66,12 +65,6 @@ public class RedisOutboundGateway extends AbstractReplyProducingMessageHandler
 		this.redisTemplate.afterPropertiesSet();
 	}
 
-	@Override
-	public void setIntegrationEvaluationContext(EvaluationContext evaluationContext) {
-		Assert.notNull(evaluationContext, "'evaluationContext' must not be null");
-		this.evaluationContext = evaluationContext;
-	}
-
 	@SuppressWarnings("unchecked")
 	public void setArgumentsSerializer(RedisSerializer<?> serializer) {
 		Assert.notNull(serializer, "'serializer' must not be null");
@@ -106,6 +99,12 @@ public class RedisOutboundGateway extends AbstractReplyProducingMessageHandler
 		return "redis:outbound-gateway";
 	}
 
+	@Override
+	protected void doInit() {
+		super.doInit();
+		this.evaluationContext = ExpressionUtils.createStandardEvaluationContext(getBeanFactory());
+	}
+
 	@Override
 	protected Object handleRequestMessage(Message<?> requestMessage) {
 		final String command = this.commandExpression.getValue(this.evaluationContext, requestMessage, String.class);

spring-integration-redis/src/main/java/org/springframework/integration/redis/outbound/RedisPublishingMessageHandler.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2007-2014 the original author or authors
+ * Copyright 2007-2015 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.
@@ -24,7 +24,7 @@ import org.springframework.data.redis.serializer.StringRedisSerializer;
 import org.springframework.expression.EvaluationContext;
 import org.springframework.expression.Expression;
 import org.springframework.expression.common.LiteralExpression;
-import org.springframework.integration.expression.IntegrationEvaluationContextAware;
+import org.springframework.integration.expression.ExpressionUtils;
 import org.springframework.integration.handler.AbstractMessageHandler;
 import org.springframework.integration.support.converter.SimpleMessageConverter;
 import org.springframework.messaging.Message;
@@ -36,7 +36,7 @@ import org.springframework.util.Assert;
  * @author Artem Bilan
  * @since 2.1
  */
-public class RedisPublishingMessageHandler extends AbstractMessageHandler implements IntegrationEvaluationContextAware {
+public class RedisPublishingMessageHandler extends AbstractMessageHandler {
 
 	private final RedisTemplate<?, ?> template;
 
@@ -56,11 +56,6 @@ public class RedisPublishingMessageHandler extends AbstractMessageHandler implem
 		this.template.afterPropertiesSet();
 	}
 
-	@Override
-	public void setIntegrationEvaluationContext(EvaluationContext evaluationContext) {
-		this.evaluationContext = evaluationContext;
-	}
-
 	public void setSerializer(RedisSerializer<?> serializer) {
 		Assert.notNull(serializer, "'serializer' must not be null");
 		this.serializer = serializer;
@@ -101,8 +96,9 @@ public class RedisPublishingMessageHandler extends AbstractMessageHandler implem
 	protected void onInit() throws Exception {
 		Assert.notNull(topicExpression, "'topicExpression' must not be null.");
 		if (this.messageConverter instanceof BeanFactoryAware) {
-			((BeanFactoryAware) this.messageConverter).setBeanFactory(this.getBeanFactory());
+			((BeanFactoryAware) this.messageConverter).setBeanFactory(getBeanFactory());
 		}
+		this.evaluationContext = ExpressionUtils.createStandardEvaluationContext(getBeanFactory());
 	}
 
 	@Override

spring-integration-redis/src/main/java/org/springframework/integration/redis/outbound/RedisQueueOutboundChannelAdapter.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2013 the original author or authors
+ * Copyright 2013-2015 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.
@@ -24,7 +24,7 @@ import org.springframework.data.redis.serializer.StringRedisSerializer;
 import org.springframework.expression.EvaluationContext;
 import org.springframework.expression.Expression;
 import org.springframework.expression.common.LiteralExpression;
-import org.springframework.integration.expression.IntegrationEvaluationContextAware;
+import org.springframework.integration.expression.ExpressionUtils;
 import org.springframework.integration.handler.AbstractMessageHandler;
 import org.springframework.messaging.Message;
 import org.springframework.util.Assert;
@@ -35,7 +35,7 @@ import org.springframework.util.Assert;
  * @author Artem Bilan
  * @since 3.0
  */
-public class RedisQueueOutboundChannelAdapter extends AbstractMessageHandler implements IntegrationEvaluationContextAware {
+public class RedisQueueOutboundChannelAdapter extends AbstractMessageHandler {
 
 	private final RedisSerializer<String> stringSerializer = new StringRedisSerializer();
 
@@ -67,11 +67,6 @@ public class RedisQueueOutboundChannelAdapter extends AbstractMessageHandler imp
 		this.template.afterPropertiesSet();
 	}
 
-	@Override
-	public void setIntegrationEvaluationContext(EvaluationContext evaluationContext) {
-		this.evaluationContext = evaluationContext;
-	}
-
 	public void setExtractPayload(boolean extractPayload) {
 		this.extractPayload = extractPayload;
 	}
@@ -87,6 +82,12 @@ public class RedisQueueOutboundChannelAdapter extends AbstractMessageHandler imp
 		return "redis:queue-outbound-channel-adapter";
 	}
 
+	@Override
+	protected void onInit() throws Exception {
+		super.onInit();
+		this.evaluationContext = ExpressionUtils.createStandardEvaluationContext(getBeanFactory());
+	}
+
 	@Override
 	@SuppressWarnings("unchecked")
 	protected void handleMessageInternal(Message<?> message) throws Exception {