Implement the client and server models based on the ICE framework in python

Implement the client and server models based on the ICE framework in python

 

ICE (Internet Communication Engine) is a Communication middleware implemented by zeroc.

Features:

1. Multiple Languages Support C ++, Java, python, C #, etc,

2. Support for distributed systems, including load balancing, location services, and real-time startup of computing nodes.

3. Provides a publishing-subscription mechanism for message generation ICEStorm

 

I. Writing slice files must be implemented according to the slice-defined syntax.

Printer. ice

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module Demo { interface Printer { void printString(string s); }; };

 

2. Compile the slice code. The official tutorial provides the command line compilation method:

? Slice2py Printer. ice

This method also requires additional installation of the slice2py command. To save trouble, we use dynamic loading of the slice file in the program and compiling it.

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3. Implement server code

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import sys, traceback, Ice # Dynamically load and compile slice files Ice.loadSlice("./Printer.ice") # Demo is the name of the module exported from Printer. ice. import Demo # Implement a service class class PrinterI(Demo.Printer): def printString(self, s, current=None): print s status = 0 ic = None try: # Initialize ice run time (ice run time) Ice. Communicator ic = Ice.initialize(sys.argv) # Initialize an adapter named "SimplePrinterAdapter" # Use the default protocol TCP/IP listener port 10000 adapter = ic.createObjectAdapterWithEndpoints("SimplePrinterAdapter", "default -p 10000") # Instantiate a working servant for our Printer interface object = PrinterI() # Add the instantiated servant to the adapter. His identifier is "SimplePrinter" adapter.add(object, ic.stringToIdentity("SimplePrinter")) # Activate the adapter adapter.activate() # Waiting for the end signal ic.waitForShutdown() except: traceback.print_exc() status = 1 if ic: # Clean up try: ic.destroy() except: traceback.print_exc() status = 1

 

4. Implement the client

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import sys, traceback, Ice import Demo status = 0 ic = None try: # Initialize the runtime environment ic = Ice.initialize(sys.argv) # Obtain the proxy of the remote printer service base = ic.stringToProxy("SimplePrinter:default -p 10000") # Request the server to confirm: "Is this the proxy interface of Demo: Printer? " printer = Demo.PrinterPrx.checkedCast(base) if not printer: raise RuntimeError("Invalid proxy") # Remote call, which looks like a local service printer.printString("Hello World!") except: traceback.print_exc() status = 1 if ic: # Clean up try: ic.destroy() except: traceback.print_exc() status = 1 sys.exit(status)