XMLRPC

1
XML-RPC

• Paul Flynn
• CS775 Fall 2001
• 6 Nov 2001

2
Background

• Designed to leverage XML for marshalling/unmarshal
  ling RPC calls
• Precursor to SOAP
• Can be used with wide variety of platforms
• Information http//www.xmlrpc.com

3
Advantages / Disadvantages

• Simple to implement
• Uses HTTP so can pass through firewalls
• Mix/match clients and servers platforms

• Limited number of types
• Actual XML very verbose (never seen)
• SOAP more flexible

4
Data types
5
Sample Code

• Register Server
• Client Setup
• Client Use

XmlRpc.setDriver("org.apache.xerces.parsers.SAXPar
ser") WebServer server new WebServer(Integer.pa
rseInt(args0)) server.addHandler("s
tore", new StoreImpl())
XmlRpc.setDriver("org.apache.xerces.parsers.SAXPar
ser") XmlRpcClient str new XmlRpcClient(url)
Vector parnew Vector() par.addElement(uid) par.
addElement(new Integer(qty)) str.execute("store.a
ddinventory",par)
6
Client
Server

• private void doAddnewitem (Itemstr item)
• ByteArrayOutputStream bosnull
• try
• bosnew ByteArrayOutputStream()
• ObjectOutputStream oos
• new ObjectOutputStream(bos)
• oos.writeObject(item)
• oos.close()
• Vector parnew Vector()
• par.addElement(bos.toByteArray())
• Boolean test (Boolean)client.execute(
• "store.addnewitem",par))
• if(test.booleanValue())
• //do success
• else
• //do failure

• public boolean addnewitem (byte in_item)
• Itemstr itnull
• try
• ObjectInputStream ois
• new ObjectInputStream (
• new ByteArrayInputStream(in_item))
• it (Itemstr)ois.readObject()
• catch(Exception e)
• // now call the original form of the method
• return addnewitem(it)
• public boolean addnewitem (Itemstr item)
• try
• products.put(item.uid, item)
• catch(NullPointerException e)
• return false