/// <summary>
///
/// </summary>
/// <param name="inSharedMemType"></param>
/// <param name="inName"></param>
/// <param name="inCapacity"></param>
/// <returns></returns>
internal bool InitClient(SharedMemoryType inSharedMemType, string inName, long inServerCapacity, long inClientCapacity)
{
bool result = true;
//:::::::::::::::::::::::::::::::::::::
try
{
_serverCapacity = inServerCapacity;
_clientCapacity = inClientCapacity;
_sharedMemoryManagerType = SharedMemoryManagerType.Client;
result = _sharedMemoryManager.Init(_sharedMemoryManagerType, inSharedMemType, inName, TotalCapacity);
if (result)
{
pSetBeginMemory(TotalCapacity);
}
}
catch
{
result = false;
}
//:::::::::::::::::::::::::::::::::::::
return(result);
}
/// <summary>
///
/// </summary>
/// <param name="inSharedMemType"></param>
/// <param name="inName"></param>
/// <param name="inCapacity"></param>
/// <returns></returns>
public SharedMemoryController BuildClientController(SharedMemoryType inSharedMemType, string inName, long inServerCapacity, long inClientCapacity)
{
SharedMemoryController result = new SharedMemoryController();
//:::::::::::::::::::::::::::::::::::::::::
result.InitClient(inSharedMemType, inName, inServerCapacity, inClientCapacity);
//:::::::::::::::::::::::::::::::::::::::::
return(result);
}
/// <summary>
///
/// </summary>
/// <param name="inShareType"></param>
/// <param name="inName"></param>
/// <param name="inCapacity"></param>
/// <returns></returns>
bool pInitClient(SharedMemoryType inShareType, string inName, long inCapacity)
{
bool result = true;
//:::::::::::::::::::::::::::::
result = (inShareType == SharedMemoryType.File) ? pInitClientSharedMemMappedFile(inName) : pInitClientSharedMem(inName);
//:::::::::::::::::::::::::::::
return(result);
}
/// <summary>
///
/// </summary>
/// <param name="inType"></param>
/// <returns></returns>
public bool Init(SharedMemoryManagerType inType, SharedMemoryType inShareType, string inName, long inCapacity)
{
bool result = true;
//:::::::::::::::::::::::::::::
result = (inType == SharedMemoryManagerType.Server) ? pInitServer(inShareType, inName, inCapacity) : pInitClient(inShareType, inName, inCapacity);
//:::::::::::::::::::::::::::::
return(result);
}
/// <summary>
/// Constructor
/// </summary>
/// <param name="name">
/// The name the shared memory will be given, this is combination of node,
/// username, admin status, and some other ones,
/// see LocalNodeProviderGlobalNames.NodeInputMemoryName for greater detail.
/// </param>
/// <param name="type">
/// This type determines which lock and stream needs to be instantiated
/// within the shared memory class. For example,
/// read only means, only create a memory stream,
/// a read lock and a backing byte array and a binary reader. A write
/// only type means, create a memory stream, write lock and a binary writer.
/// This type however does not set the type of the memory mapped section,
/// the memory mapped section itself is created
/// with READWRITE access.
///</param>
/// <param name="allowExistingMapping">
/// The shared memory is given a parameter to determine whether or not to
/// reuse an existing mapped memory secion. When the node is first created
/// this is false, however when the shared memory threads are created this
/// is true. We do this because we create the shared memory when the node
/// is created, at this point the there should be no shared memory with the
/// same name. However when we create the reader and writer threads
/// (which happens on node reuse) we want to reuse the memory.
///</param>
internal SharedMemory(string name, SharedMemoryType type, bool allowExistingMapping)
{
this.type = type;
InitializeMemoryMapping(name, allowExistingMapping);
writeBytesRemaining = 0;
readBytesRemaining = 0;
readBytesTotal = 0;
largeObjectsQueue = null;
// Has the shared memory been properly created and is ready to use
if (IsUsable)
{
// Setup the structures for either a read only or write only stream
InitializeStreams(type);
try
{
// This could fail if two different administrator accounts try and
// access each others nodes as events and semaphores are protected
// against cross account access
InitializeSynchronization();
}
catch (System.UnauthorizedAccessException)
{
if (writeStream != null)
{
// Closes binary writer and the underlying stream
binaryWriter.Close();
}
if (readStream != null)
{
// Closes binary reader and the underlying stream
binaryReader.Close();
}
NativeMethods.UnmapViewOfFile(pageFileView);
pageFileMapping.Dispose();
}
}
}
/// <summary>
/// Initialize the MemoryStreams which will be used to contain the serialized data from the LocalCallDescriptors.
/// </summary>
private void InitializeStreams(SharedMemoryType streamType)
{
// Initialize the .net binary formatter in case we need to use .net serialization.
this.binaryFormatter = new BinaryFormatter();
this.loggingTypeCache = new Hashtable();
if (streamType == SharedMemoryType.ReadOnly)
{
this.readBuffer = new byte[size];
this.readStream = new MemoryStream(this.readBuffer);
this.binaryReader = new BinaryReader(this.readStream);
readLock = new object();
}
else if (streamType == SharedMemoryType.WriteOnly)
{
this.writeStream = new MemoryStream();
writeLock = new object();
this.binaryWriter = new BinaryWriter(this.writeStream);
}
else
{
ErrorUtilities.VerifyThrow(false, "Unknown shared memory type.");
}
}
/// <summary>
/// Initialize the MemoryStreams which will be used to contain the serialized data from the LocalCallDescriptors.
/// </summary>
private void InitializeStreams(SharedMemoryType streamType)
{
// Initialize the .net binary formatter in case we need to use .net serialization.
this.binaryFormatter = new BinaryFormatter();
this.loggingTypeCache = new Hashtable();
if (streamType == SharedMemoryType.ReadOnly)
{
this.readBuffer = new byte[size];
this.readStream = new MemoryStream(this.readBuffer);
this.binaryReader = new BinaryReader(this.readStream);
readLock = new object();
}
else if (streamType == SharedMemoryType.WriteOnly)
{
this.writeStream = new MemoryStream();
writeLock = new object();
this.binaryWriter = new BinaryWriter(this.writeStream);
}
else
{
ErrorUtilities.VerifyThrow(false, "Unknown shared memory type.");
}
}
/// <summary>
/// Constructor
/// </summary>
/// <param name="name">
/// The name the shared memory will be given, this is combination of node,
/// username, admin status, and some other ones,
/// see LocalNodeProviderGlobalNames.NodeInputMemoryName for greater detail.
/// </param>
/// <param name="type">
/// This type determines which lock and stream needs to be instantiated
/// within the shared memory class. For example,
/// read only means, only create a memory stream,
/// a read lock and a backing byte array and a binary reader. A write
/// only type means, create a memory stream, write lock and a binary writer.
/// This type however does not set the type of the memory mapped section,
/// the memory mapped section itself is created
/// with READWRITE access.
///</param>
/// <param name="allowExistingMapping">
/// The shared memory is given a parameter to determine whether or not to
/// reuse an existing mapped memory secion. When the node is first created
/// this is false, however when the shared memory threads are created this
/// is true. We do this because we create the shared memory when the node
/// is created, at this point the there should be no shared memory with the
/// same name. However when we create the reader and writer threads
/// (which happens on node reuse) we want to reuse the memory.
///</param>
internal SharedMemory(string name, SharedMemoryType type, bool allowExistingMapping)
{
this.type = type;
InitializeMemoryMapping(name, allowExistingMapping);
writeBytesRemaining = 0;
readBytesRemaining = 0;
readBytesTotal = 0;
largeObjectsQueue = null;
// Has the shared memory been properly created and is ready to use
if (IsUsable)
{
// Setup the structures for either a read only or write only stream
InitializeStreams(type);
try
{
// This could fail if two different administrator accounts try and
// access each others nodes as events and semaphores are protected
// against cross account access
InitializeSynchronization();
}
catch (System.UnauthorizedAccessException)
{
if (writeStream != null)
{
// Closes binary writer and the underlying stream
binaryWriter.Close();
}
if (readStream != null)
{
// Closes binary reader and the underlying stream
binaryReader.Close();
}
NativeMethods.UnmapViewOfFile(pageFileView);
pageFileMapping.Dispose();
}
}
}
