fixed GH #2217: UUIDGenerator should allow random seed

Foundation/include/Poco/UUIDGenerator.h

@@ -37,7 +37,7 @@ class Foundation_API UUIDGenerator
 	/// as specified in Appendix A of the DCE 1.1 Remote Procedure
 	/// Call Specification (http://www.opengroup.org/onlinepubs/9629399/),
 	/// RFC 2518 (WebDAV), section 6.4.1 and the UUIDs and GUIDs internet
-	/// draft by Leach/Salz from February, 1998 
+	/// draft by Leach/Salz from February, 1998
 	/// (http://ftp.ics.uci.edu/pub/ietf/webdav/uuid-guid/draft-leach-uuids-guids-01.txt)
 {
 public:
@@ -53,7 +53,7 @@ public:
 		///
 		/// Throws a SystemException if no MAC address can be
 		/// obtained.
-	
+
 	UUID createFromName(const UUID& nsid, const std::string& name);
 		/// Creates a name-based UUID.
 
@@ -66,21 +66,28 @@ public:
 
 	UUID createFromName(const UUID& nsid, const std::string& name, DigestEngine& de, UUID::Version version);
 		/// Creates a name-based UUID, using the given digest engine and version.
-		
+
 	UUID createRandom();
 		/// Creates a random UUID.
-		
+
 	UUID createOne();
-		/// Tries to create and return a time-based UUID (see create()), and, 
+		/// Tries to create and return a time-based UUID (see create()), and,
 		/// if that does not work due to the unavailability of a MAC address,
 		/// creates and returns a random UUID (see createRandom()).
 		///
 		/// The UUID::version() method can be used to determine the actual kind of
 		/// the UUID generated.
 
+	void seed(UInt32 n);
+		/// Seeds the internal pseudo random generator for time-based UUIDs with the given seed.
+
+	void seed();
+		/// Seeds the internal pseudo random generator used for time-based UUIDs
+		/// with a random seed obtained from a RandomInputStream.
+
 	static UUIDGenerator& defaultGenerator();
 		/// Returns a reference to the default UUIDGenerator.
-		
+
 protected:
 	Timestamp::UtcTimeVal timeStamp();
 	void getNode();
@@ -92,7 +99,7 @@ private:
 	int                 _ticks;
 	Environment::NodeId _node;
 	bool                _haveNode;
-	
+
 	UUIDGenerator(const UUIDGenerator&);
 	UUIDGenerator& operator = (const UUIDGenerator&);
 };

Foundation/src/UUIDGenerator.cpp

@@ -90,7 +90,7 @@ UUID UUIDGenerator::createFromName(const UUID& nsid, const std::string& name, Di
 	return UUID(buffer, version);
 }
 
-	
+
 UUID UUIDGenerator::createRandom()
 {
 	char buffer[16];
@@ -136,6 +136,22 @@ UUID UUIDGenerator::createOne()
 }
 
 
+void UUIDGenerator::seed()
+{
+	Poco::FastMutex::ScopedLock lock(_mutex);
+
+	_random.seed();
+}
+
+
+void UUIDGenerator::seed(UInt32 n)
+{
+	Poco::FastMutex::ScopedLock lock(_mutex);
+
+	_random.seed(n);
+}
+
+
 namespace
 {
 	static SingletonHolder<UUIDGenerator> sh;