Added timestamp and methods to retrieve attribute and property names.

spring-integration-core/src/main/java/org/springframework/integration/message/MessageHeader.java

@@ -17,8 +17,10 @@
 package org.springframework.integration.message;
 
 import java.util.Date;
+import java.util.HashSet;
 import java.util.Map;
 import java.util.Properties;
+import java.util.Set;
 import java.util.concurrent.ConcurrentHashMap;
 
 /**
@@ -36,6 +38,8 @@ public class MessageHeader {
 
 	private String replyChannelName;
 
+	private Date timestamp = new Date();
+
 	private Date expiration;
 
 	private int sequenceNumber = 1;
@@ -67,6 +71,10 @@ public class MessageHeader {
 		return this.sequenceNumber;
 	}
 
+	public Date getTimestamp() {
+		return this.timestamp;
+	}
+
 	/**
 	 * Set the expiration date for this message or <code>null</code> to
 	 * indicate 'never expire'. The default is <code>null</code>.
@@ -103,6 +111,14 @@ public class MessageHeader {
 		this.properties.setProperty(key, value);
 	}
 
+	public Set<String> getPropertyNames() {
+		Set<String> propertyNames = new HashSet<String>();
+		for (Object key : this.properties.keySet()) {
+			propertyNames.add((String) key);
+		}
+		return propertyNames; 
+	}
+
 	public Object getAttribute(String key) {
 		return this.attributes.get(key);
 	}
@@ -111,4 +127,8 @@ public class MessageHeader {
 		this.attributes.put(key, value);
 	}
 
+	public Set<String> getAttributeNames() {
+		return this.attributes.keySet();
+	}
+
 }