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High-Performance Predictive XML Parsing with gSOAP

High-Performance Predictive XML Parsing with gSOAP. Robert van Engelen Florida State University. The gSOAP Toolkit. Project timeline. 12/2003. 10/2001. 12/2002. 3/2002. 1/2002. 9/2003. 1/2000. 7/2002. 1/2004. 3/2004. 9/2004. v1.2 latency hiding; WSDL output. v2.0 MT/safe.

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High-Performance Predictive XML Parsing with gSOAP

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  1. High-Performance Predictive XML Parsing with gSOAP Robert van EngelenFlorida State University

  2. The gSOAP Toolkit • Project timeline 12/2003 10/2001 12/2002 3/2002 1/2002 9/2003 1/2000 7/2002 1/2004 3/2004 9/2004 v1.2latencyhiding;WSDLoutput v2.0MT/safe v1.1streamingXML;SOAP1.1RPC v1.3HTTPSSSL v2.1DIME v2.2streaming DIME v2.3SOAP1.2 v2.4Doc/Lit;WSDL1.1tools v2.5WS-BP1.0a v2.6 v2.7SwA;WS-* >50,000 downloads www.genivia.com http://gsoap2.sourceforge.net

  3. Early Versus Late Bindings EARLY BINDING Static proxy generation with schema-specific DFA-based XML parsing Static proxy generation with schema-specific PDA-based XML parsing flexibility performance Static proxy generation with generic XML parsing Dynamic proxy generation (DII) with generic XML parsing LATE BINDING

  4. gSOAP Architecture • Static binding • WSDL tools to generate bindings • Stub/skeleton compiler to generate C and C++ code • Schema-specific predictive XML parsing • Supports in-situ serialization and deseralization of application’s native C/C++ data structures in XML • Integrated stacks • TCP/IP - HTTP/S - DIME/MIME - SOAP/XML • Transport latency hiding

  5. Client Application Development and Deployment Service definition:service.wsdl WSDL Importer Client Application Bindings:service.h Client Proxy Object gSOAP Compiler Stub Client-side code Marshal Demarshal

  6. Server Development and Deployment Service definition:service.wsdl WSDL Importer Web Service Bindings:service.h Server Object gSOAP Compiler Skeleton Server-side code Marshal Demarshal

  7. Server Development and Deployment (Alternative) Web Service Bindings:service.h Server Object gSOAP Compiler Skeleton Server-side code Marshal Demarshal Service definition:service.wsdl

  8. Schema-Specific Predictive XML Parsing Bindings WSDL Importer &gSOAP Compiler XML Schemas PredictiveXML Parser class ns__List{ std::vector<char*> item; int in(char* tag); int out(char *tag);}; <complexType name=“List”> <complexContent> <sequence> <element name=“item” type=“xsd:string” maxOccurs=“unbounded”/> </sequence> </complexContent></complexType> int ns__List::in(char* tag){ if (begin_element(tag) != OK) return TAG_MISMATCH; in_vectorOfstring(item, “item”); end_element(tag); }

  9. Latency Hiding with Integrated Stacks Serialization HTTPoverTCP/IP Deserialization

  10. Latency and Speedup Interop Round 2 Base echoVoid() latency better Relative average speedup for array-based SOAP messages(10 to 80,000 ints, doubles, and strings) better

  11. DFA-Based Parsing Expat gSOAP DFA better DFA (opt)

  12. Conclusions • Static bindings with predictive XML parsing delivers performance • Two-stage compilation 1) bindings 2) code • Integrated stacks to improve performance • DFA-based parsing probably too limited for realistic applications • More info: http://gsoap2.sourceforge.net

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