SOA13: Advanced AppServer Topics - PowerPoint PPT Presentation

Title: SOA13: Advanced AppServer Topics


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SOA-13 Advanced AppServer Topics
Pat Bonser
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Advanced AppServer Topics
Agenda

• Architecture Components
• Connection Management
• Session Managed Model
• Session-Free Model
• Diagnostics, Logging Debugging
• Migration Steps for Deployed Applications

This presentation includes annotations with
additional, complementary information
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Distributed Applications Architecture

Clients
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Application Server Architecture
Any Client
OpenEdge Application Server
Application Code
AppServer
Data
Web service Client
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Application Server Architecture
WebSpeed is a Client too!
OpenEdge Application Server
WebSpeed Transaction Server
Application Code
AppServer
Data
Web service Client
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Application Server Components
AppServer Architecture
AppServer
AppServer Agents
Clients
Application Broker
ABL Business Logic
NameServer
Data
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Application Server Components
AppServer Broker

• Manages pools of re-usable AppServer Agents
• Manages client connections and requests for
  AppServer Agents to execute ABL

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Application Server Components
AppServer Agents

• Executes OpenEdge ABL procedures
• Reuse of AppServer Agents
• Determined by Operating mode

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Application Server Components
NameServer
Location transparency
Inventory (A and B)
Clients
NameServer
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Application Server Components
AppServer Internet Adapter

• ALL Clients to OpenEdge AppServer Applications
• Can connect remotely
• Tunneling
• HTTP (AIA)
• HTTPS (AIA/S)
• Java Servlet
• Runs on Web Server with Java Servlet Engine

Included with OpenEdge Application Servers
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Advanced AppServer Topics
Agenda

• Architecture Components
• Connection Management
• Session Managed Model
• Session-Free Model
• Diagnostics, Logging Debugging
• Migration Steps for Deployed Applications

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Session Models Operating Modes
Connection management

• Session managed model
• Client sends requests over persistent connection
• Requests handled sequentially
• Operating Modes
• State-reset
• State-aware
• Stateless

• Session-free model
• Client send requests on any available connection
• Requests handled in parallel
• Operating Mode
• State-free

OpenEdge 10.0
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Session Models Operating Modes
Connection management

• Specified when AppServer is configured
• Determines how client requests dispatched to
  individual Application Server Agents
• Design time considerations
• Design development of application
• Application context
• Performance Goals
• System resources, network response
• Request throughput and response time

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Session Managed Model
Operating Modes

• State-reset
• One client per Application Server Agent
• Session state is reset on disconnect
• State-aware
• One client per Application Server Agent
• Session state is maintained across connections
• Stateless
• Connection managed by AppServer Broker
• Many clients per application server agent
• Context must be managed externally

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Session Managed Model
state-aware state-reset Operating Modes
AppServer
AppServer Agents
Client 1
Client 2
Application Broker
NameServer
Data
Client 3
Client 4
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Session Managed Model
Stateless Operating Mode
AppServer
AppServer Agents
Client 1
Client 2
Application Broker
NameServer
Data
Client 3
Client 4
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Advanced AppServer Topics
Agenda

• Architecture Components
• Connection Management
• Session Managed Model
• Session-Free Model
• Diagnostics, Logging Debugging
• Migration Steps for Deployed Applications

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Session-free Model
State-free Operating Mode
ABL Clients
AppServer
AppServer Agents
Client 1
Open Clients
Client 2
Application Broker
Web Service Client
Web Services Adapter
Client 3
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Session-free Model
State-free Operating Mode

• Logical Connection
• No connection maintained between Client and
  Application Server Agent
• Pooled Connections
• ABL requests on the server handle
• Web service requests on the WSA
• Open Client requests on the AppObject
• Requests dispatched similar to stateless except
• Multiple requests from one client run in parallel
• Each request runs independently
• Context must be managed externally

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Session-free Model
Design Considerations

• Avoid dependency on other calls!
• Procedures can execute concurrently
• Order of completion NOT predictable
• Context Management
• Session or task level
• Client or Server
• When to delete

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Why When to use Session-free Model

• Some applications inherently NOT connection
  oriented
• Requests executed regardless of other requests
• Should not be tied to one AppServer Connection
• i.e. standalone request for information
• Efficiency and Performance
• Parallel execution on any AppServer
• Efficient use of resources
• Performance gains
• Scalability

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What about ASYNC Calls?
Does Async mean parallel execution?
RUN proc ON server ASYNCHRONOUS . . . .

• Session-managed Model
• Allow multiple remote procedures to be executed
• Run serially on same AppServer
• Session-free Model
• Will allow procedures to execute concurrently

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Coding Example RUN ASYNCHRONOUS
Session-free Model

• Internal procedure run in procedure handle
• Each call to internal procedure queued on the
  client

RUN bl.p ON SERVER hAppSrv ASYNCHRONOUS SET
hRq2 EVENT-PROCEDURE bl-evt-proc IN
THIS-PROCEDURE (INPUT-OUTPUT TABLE
order-table,OUTPUT iCount).
PROCEDURE bl-evt-proc DEFINE INPUT PARAMETER
TABLE FOR order-table. DEFINE INPUT PARAMETER
iCount as INT NO-UNDO.
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Enhanced Syntax to support to Session-free

• CONNECT()
• Method
• Properties
• CANCEL-REQUESTS() method
• CLIENT-CONNECTION-ID attribute

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CONNECT() method

• -sessionModel
• Default Session-managed
• Set to Session-free to use the session-free model

fOk hAppSrvCONNECT( -URL AppServer//hostpor
t/servicename -sessionModel Session-free).

• Model and mode must match
• Session-free Client
• can only connect to
• State-free AppServer

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CONNECT()

• Session-free connection
• Pool of re-usable socket connections
• AppServer handle points to pool
• Managed transparently by Client
• Connections allocated as needed
• Tunable using CONNECT() properties

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CANCEL-REQUESTS() method

• Session managed Model
• Raises STOP for request currently running
• Purges send request queue of pending requests
• Session-free Model
• Raises STOP for ALL requests currently running
• Purges queued requests

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CLIENT-CONNECTION-ID attribute

• Character attribute on a server handle associated
  with session-managed applications
• Session-managed
• Returns connection ID string for the AppServer
  connection associated with the server handle
• Session-free
• Logical connection to the AppServer is
  represented by a pool of AppServer connections
• Returns the unknown value

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NameServer Load Balancing

• Session managed Model
• On Client connection to the AppServer
• Same AppServer serves all requests from a client
• Session-free Model
• On each request

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Persistent Procedures in a Session-free Model

• A context is created for the internal procedures
• All internal procedures on a remote procedure
• Will execute on the same AppServer
• Will execute serially
• Losing parallel advantage
• Reducing scalability

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Advanced AppServer Topics
Agenda

• Architecture Components
• Connection Management
• Session Managed Model
• Session-Free Model
• Diagnostics, Logging Debugging
• Migration Steps for Deployed Applications

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Logging Infrastructure

• Log Files
• Unified Format
• Log Entry Types
• Logging Levels
• Log size threshold
• LOG-MANAGER
• Log File Analysis
• LogRead Utility

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Diagnostics, Logging Debugging
Where to look for an AppServer Application

• Which Log?

• What about the Client?
• -clientlog logfilename

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Log Entry Types

• Server/Client Executables
• 4GLMessages1
• 4GLTrace
• DB.Connects
• DynObjects.
• QryInfo
• SAX
• ProEvents.

• Other
• AIA
• ASPlumbing
• ASDefault
• NSPlumbing
• UBroker.
• WSADefault
• MsgrTrace

1Client only
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Logging Levels

• Setting logginglevel
• StartUp Parameter
• LOG-MANAGER system handle
• Ubroker.properties file
• Logginglevel Values
• 0 None
• 1 Errors
• 2 Basic
• 3 Verbose
• 4 - Extended

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LOG-MANAGER
System handle attributes methods

• Attributes
• ENTRY-TYPES-LIST
• LOG-ENTRY-TYPES
• LOGFILE-NAME
• LOGGING-LEVEL
• LOG-THRESHOLD
• NUM-LOG-FILES
• TYPE

• Methods (OpenEdge 10.1A)
• CLOSE-LOG
• CLEAR-LOG
• WRITE-MESSAGE

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Log File Analysis LogRead Utility
PSDN.progress.com

• GUI Utility
• View, filter, sort, merge,
  translate log files

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Log File Analysis LogRead Utility

• Browse, Filter or Query Log

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Log File Analysis LogRead Utility
PSDN.progress.com

• Select Logs to Merge

• File Merge

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Log File Analysis LogRead Utility
PSDN.progress.com

• Analyze the Merge

?
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Debugging AppServer Code
Application Debugger Debug Modes

• Application Mode, supports distributed
• Step into AppServer code from Client session
• Attachable Mode
• Attach to remote process
• Debug attached process only
• No access to calling process
• Can be used when
• Server not local
• No monitor attached
• Easier to debug from where you are

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Enabling Debugging
Debugging is NOT enabled by default

• Client
• Start ?Programs ? OpenEdge ? Proenv
• AppServer

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Attachable Mode
Debugging Code Remotely

• Ready the AppServer Agent for debugging
• -debugReady port-number
• proDebugConfig

• Start Attachable Debugger
• Start ? Programs ? OpenEdge ? Debugger

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Attachable Debugger
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Attachable Debugger
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Remote Code is Available
Debug as usual
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Detach from Process
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Advanced AppServer Topics
Agenda

• Architecture Components
• Connection Management
• Session Managed Model
• Session-Free Model
• Diagnostics, Logging Debugging
• Migration Steps for Deployed Applications

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Migrating a Deployed Application
Planning an Upgrade

• Considerations
• Whatss New?
• Enhanced Capabilities
• Operating Modes
• Configurations - Fault Tolerance
• Steps before deployment
• Upgrade Licenses
• Convert/Migrate Database
• Migrate Code

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Migrating a Deployed Application
Deploying the Upgrade
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Migrating a Deployed Application
Deploying the Upgrade

• Register New AppServer(s)
• With existing NameServer
• Configure new NameServer
• Shutdown Clients
• Upgrade Client (license application)
• Reconnect clients to new AppServer(s)
• Shutdown old AppServer(s)
• Shutdown old NameServer

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For More Information, go to

• PSDN
• LogRead Utility
• White Papers Presentations
• Relevant Exchange Sessions
• ARCH3 Context Management in the OpenEdge
  Reference Architecture
• SOA-5 Accessing the AppServer from Anywhere
  Everywhere
• SOA10 Application Servers, Web Services and
  Integration Info Exchange

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Documentation Education

• OpenEdge Documentation
• Getting Started Application and Integration
  Services
• Application Server Administration
• Application Server Developing AppServer Apps
• Development Debugging and Troubleshooting
• OpenEdge Education
• Developing Distributed AppServer Applications
• Distributed AppServer Application Administration
• Distributed AppServer Application Development

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Advanced AppServer Topics
Questions?
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Thank you foryour time
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