AdvancedIPC unit

The AdvancedIPC unit provides two-way request/response inter-process communication between one server and multiple clients using file-based messaging. The system is non-deterministic - message processing order is not guaranteed. However, SendRequest and PostRequest/PeekResponse sequences from a single client are processed in correct order.

Because it is file based, it should not be used for intensive messaging, but it is suitable for exchanging small messages at startup, for example to transfer control to another instance. It is implemented using files as this is a common denominator on all platforms.

Classes and records

EICPException	class	Exception class for IPC-related errors
TIPCBase	class	Base class for IPC client and server functionality
TIPCClient	class	IPC client for sending requests and receiving responses
TIPCServer	class	IPC server for receiving requests and sending responses
TMessageHeader	record	Message header structure for IPC communication
TReleaseHandleStream	class	Handle stream that releases file handle on destruction

Types

TFileHandle	type	File handle type alias
TMessageType	type	Type for message type identifiers

Constants

HEADER_VERSION

constant

Message header version identifier

Resource strings

SErrInvalidServerID	resource string	Error message for invalid server ID
SErrSetGlobalActive	resource string	Error message for changing Global property while server is active
SErrSetServerIDActive	resource string	Error message for changing ServerID property while server is active

Uses

• baseunix
• sysutils
• Classes
• SingleInstance