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Web services vs. CORBA and DCOM.Web services
- Web services use HTTP protocol for sending and receiving messages between the applications.
- The data encoding in web services is based on XML.
- Web services are defined using WSDL (Web Services Description Language).
- Web services are discovered using UDDI (Universal Description, Discovery and Integration).
- Web services are firewalls friendly.
- Web services supports interoperability i.e. cross platform integration is possible.
CORBA and DCOM
- These technologies use non-standard protocol, i.e. CORBA uses IIOP (Inter Internet Object Protocol), and DCOM uses RPC (Remote Procedure Calls)
- CORBA components are defined using CORBA Interface Description Language; DCOM components are defined using Microsoft Interface definition languages
- CORBA components are discovered using the CORBA registry, DCOM using the Registry.
- DCOM is a proprietary protocol that does not support interoperability and has firewall problems as DCOM transfers data in binary format and it uses many ports to call remote functions.
- CORBA uses the IIOP protocol, which is non-Internet friendly.
- CORBA and DCOM are fine for building enterprise applications that runs on the same platform and not good enough for applications that span platforms and languages.
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