C# Class SharedMemory.SharedBuffer

Inheritance: IDisposable

Exibir arquivo Open project: McManning/Coherence

Protected Properties

Property	Type	Description
BufferStartPtr	byte*
Header	SharedHeader*
Mmf	MemoryMappedFile
View	MemoryMappedViewAccessor
ViewPtr	byte*

Public Methods

Method	Description
Close ( ) : void	Sets the ShuttingDown flag, and disposes of the MemoryMappedFile and MemoryMappedViewAccessor. Attempting to read/write to the buffer after closing will result in a System.NullReferenceException.
Dispose ( ) : void	Performs application-defined tasks associated with freeing, releasing, or resetting unmanaged resources.

Protected Methods

Method	Description
Dispose ( bool disposeManagedResources ) : void	IDisposable pattern - dispose of managed/unmanaged resources
DoClose ( ) : void	Any classes that inherit from SharedBuffer should implement any Close logic here, Mmf and View are still active at this point. There is no need to call base.DoClose() from these classes. It is possible for Close to be called before Open has completed successfully, in this situation DoClose should fail gracefully.
DoOpen ( ) : bool	Allows any classes that inherit from SharedBuffer to perform additional open logic. There is no need to call base.DoOpen() from these implementations. By throwing an exception or returning false, the call to Open will fail and Close will be called.
InitialiseHeader ( ) : void	Initialises the header within the shared memory. Only applicable if IsOwnerOfSharedMemory is true.
Read ( Action readFunc, long bufferPosition ) : void	Prepares an IntPtr to the buffer position and calls readFunc to perform the reading.
Read ( IntPtr destination, int length, long bufferPosition ) : void	Reads length bytes into the memory location destination from the buffer region of the shared memory.
Read ( &data, long bufferPosition ) : void	Reads an instance of T from the buffer
Read ( Array destination, long bufferPosition ) : void	Reads an array of T from the buffer.
ReadArray ( Array destination, int index, int count, long bufferPosition ) : void	Reads a number of elements from a memory location into the provided buffer starting at the specified index.
SharedBuffer ( string name, long bufferSize, bool ownsSharedMemory ) : System	Create a new SharedBuffer instance with the specified name and buffer size The maximum total shared memory size is dependent upon the system and current memory fragmentation. The shared memory layout on 32-bit and 64-bit is: `\| Header \| Buffer \| \| 16-bytes \| bufferSize \|`
Write ( Action writeFunc, long bufferPosition ) : void	Prepares an IntPtr to the buffer position and calls writeFunc to perform the writing.
Write ( IntPtr source, int length, long bufferPosition ) : void	Writes length bytes from the source into the shared memory buffer.
Write ( &source, long bufferPosition ) : void	Writes an instance of T into the buffer
Write ( Array source, int index, long bufferPosition ) : void	Writes an array of T into the buffer
Write ( Array source, long bufferPosition ) : void	Writes an array of T into the buffer
WriteArray ( Array source, int index, int count, long bufferPosition ) : void	Writes an array of T into the buffer

Private Methods

Method	Description
Open ( ) : bool

Method Details

Close() public method

Sets the ShuttingDown flag, and disposes of the MemoryMappedFile and MemoryMappedViewAccessor.
Attempting to read/write to the buffer after closing will result in a System.NullReferenceException.

public Close ( ) : void
return	void

Dispose() public method

Performs application-defined tasks associated with freeing, releasing, or resetting unmanaged resources.

public Dispose ( ) : void
return	void

Dispose() protected method

IDisposable pattern - dispose of managed/unmanaged resources

protected Dispose ( bool disposeManagedResources ) : void
disposeManagedResources	bool	true to dispose of managed resources as well as unmanaged.
return	void

DoClose() protected method

Any classes that inherit from SharedBuffer should implement any Close logic here, Mmf and View are still active at this point. There is no need to call base.DoClose() from these classes.

It is possible for Close to be called before Open has completed successfully, in this situation DoClose should fail gracefully.

protected DoClose ( ) : void
return	void

DoOpen() protected method

Allows any classes that inherit from SharedBuffer to perform additional open logic. There is no need to call base.DoOpen() from these implementations.

By throwing an exception or returning false, the call to Open will fail and Close will be called.

protected DoOpen ( ) : bool
return	bool

InitialiseHeader() protected method

Initialises the header within the shared memory. Only applicable if IsOwnerOfSharedMemory is true.

protected InitialiseHeader ( ) : void
return	void

Read() protected method

Prepares an IntPtr to the buffer position and calls readFunc to perform the reading.

protected Read ( Action readFunc, long bufferPosition ) : void
readFunc	Action	A function used to read from the buffer. The IntPtr parameter is a pointer to the buffer offset by .
bufferPosition	long	The offset within the buffer region of the shared memory to read from.
return	void

Read() protected method

Reads length bytes into the memory location destination from the buffer region of the shared memory.

protected Read ( IntPtr destination, int length, long bufferPosition ) : void
destination	IntPtr	A managed pointer to the memory location to copy data into from the buffer
length	int	The number of bytes to be copied
bufferPosition	long	The offset within the buffer region of the shared memory to read from.
return	void

Read() protected method

Reads an instance of T from the buffer

protected Read ( &data, long bufferPosition ) : void
data		Output parameter that will contain the value read from the buffer
bufferPosition	long	The offset within the buffer region of the shared memory to read from.
return	void

Read() protected method

Reads an array of T from the buffer.

protected Read ( Array destination, long bufferPosition ) : void
destination	Array	Array that will contain the values read from the buffer. The length of this array controls the number of elements to read.
bufferPosition	long	The offset within the buffer region of the shared memory to read from.
return	void

ReadArray() protected method

Reads a number of elements from a memory location into the provided buffer starting at the specified index.

protected ReadArray ( Array destination, int index, int count, long bufferPosition ) : void
destination	Array	The destination buffer.
index	int	The start index within .
count	int	The number of elements to read.
bufferPosition	long	The source offset within the buffer region of the shared memory.
return	void

SharedBuffer() protected method

Create a new SharedBuffer instance with the specified name and buffer size

The maximum total shared memory size is dependent upon the system and current memory fragmentation.

protected SharedBuffer ( string name, long bufferSize, bool ownsSharedMemory ) : System
name	string	The name of the shared memory
bufferSize	long	The buffer size in bytes. The total shared memory size will be `Marshal.SizeOf(SharedMemory.SharedHeader) + bufferSize`
ownsSharedMemory	bool	Whether or not the current instance owns the shared memory. If true a new shared memory will be created and initialised otherwise an existing one is opened.
return	System

Write() protected method

Prepares an IntPtr to the buffer position and calls writeFunc to perform the writing.

protected Write ( Action writeFunc, long bufferPosition ) : void
writeFunc	Action	A function used to write to the buffer. The IntPtr parameter is a pointer to the buffer location offset by .
bufferPosition	long	The offset within the buffer region to start writing to.
return	void

Write() protected method

Writes length bytes from the source into the shared memory buffer.

protected Write ( IntPtr source, int length, long bufferPosition ) : void
source	IntPtr	A managed pointer to the memory location to be copied into the buffer
length	int	The number of bytes to be copied
bufferPosition	long	The offset within the buffer region of the shared memory to write to.
return	void

Write() protected method

Writes an instance of T into the buffer

protected Write ( &source, long bufferPosition ) : void
source		A reference to an instance of to be written into the buffer
bufferPosition	long	The offset within the buffer region of the shared memory to write to.
return	void

Write() protected method

Writes an array of T into the buffer

protected Write ( Array source, int index, long bufferPosition ) : void
source	Array	An array of to be written. The length of this array controls the number of elements to be written.
index	int	The index within the array to start writing from.
bufferPosition	long	The offset within the buffer region of the shared memory to write to.
return	void

Write() protected method

Writes an array of T into the buffer

protected Write ( Array source, long bufferPosition ) : void
source	Array	An array of to be written. The length of this array controls the number of elements to be written.
bufferPosition	long	The offset within the buffer region of the shared memory to write to.
return	void

WriteArray() protected method

Writes an array of T into the buffer

protected WriteArray ( Array source, int index, int count, long bufferPosition ) : void
source	Array	The source data to be written to the buffer
index	int	The start index within .
count	int	The number of elements to write.
bufferPosition	long	The offset within the buffer region of the shared memory to write to.
return	void

Property Details

BufferStartPtr protected_oe property

Pointer to the start of the buffer region of the memory mapped view

protected byte* BufferStartPtr
return	byte*

Header protected_oe property

Pointer to the header within shared memory

protected SharedHeader* Header
return	SharedHeader*

Mmf protected_oe property

Memory mapped file

protected MemoryMappedFile Mmf
return	MemoryMappedFile

View protected_oe property

Memory mapped view

protected MemoryMappedViewAccessor View
return	MemoryMappedViewAccessor

ViewPtr protected_oe property

Pointer to the memory mapped view

protected byte* ViewPtr
return	byte*