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EH - Concept If an error occurs during the execution of an action, the execution is terminated. In this situation, the action will not deliver the expected output. . But, if an action has an exception handler (EH) for a specific error situation, this EH is activated when an exception occurs. Using an EH, you can define how the system has to react in a specific error situation - The EH replaces the action where the error occurred . If the error e occurs, then: . All tokens in Action A are deleted • The Exception-Handler is activated . The Exception-Handler is executed instead of Action A . Execution then continues regularly Exception- Handler Action A EH - Example Following figure shows 2 examples for handling exceptions: - If a paper jam occurs during printing, printing can continue once the paper jam has been removed. If there is no paper in the printer, paper must be inserted for printing to continue until sufficient copies of the exam instructions have been printed. After all errors are handled, then the sequence can continues as the regular execution/path of the activity as if the defective action had ended normally. Create exam instructions Print exam [no] instructions [yes] paper jam L paper tray empty Resolve paper jam «decisionInput Sufficient copies printed? Add paper Fetch paper Insert paper

EH - Concept If an error occurs during the execution of an action, the execution is terminated. In this situation, the action will not deliver the expected output. . But, if an action has an exception handler (EH) for a specific error situation, this EH is activated when an exception occurs. Using an EH, you can define how the system has to react in a specific error situation - The EH replaces the action where the error occurred . If the error e occurs, then: . All tokens in Action A are deleted • The Exception-Handler is activated . The Exception-Handler is executed instead of Action A . Execution then continues regularly Exception- Handler Action A EH - Example Following figure shows 2 examples for handling exceptions: - If a paper jam occurs during printing, printing can continue once the paper jam has been removed. If there is no paper in the printer, paper must be inserted for printing to continue until sufficient copies of the exam instructions have been printed. After all errors are handled, then the sequence can continues as the regular execution/path of the activity as if the defective action had ended normally. Create exam instructions Print exam [no] instructions [yes] paper jam L paper tray empty Resolve paper jam «decisionInput Sufficient copies printed? Add paper Fetch paper Insert paper

Database System Concepts
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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based on below diagram exception handler, how to make same diagram for ATM transaction?

answers refers into object oriented modeling'

EH - Concept - If an error occurs during the execution of an action, the execution is terminated. In this situation, the action will not deliver the expected output. . But, if an action has an exception handler (EH) for a specific error situation, this EH is activated when an exception occurs. Using an EH, you can define how the system has to react in a specific error situation - The EH replaces the action where the error occurred . If the error e occurs, then: . I All tokens in Action A are deleted The Exception-Handler is activated The Exception-Handler is executed instead of Action A Execution then continues regularly Exception- Handler Action A EH - Example Following figure shows 2 examples for handling exceptions: If a paper jam occurs during printing, printing can continue once the paper jam has been removed. If there is no paper in the printer, paper must be inserted for printing to continue until sufficient copies of the exam instructions have been printed. After all errors are handled, then the sequence can continues as the regular execution/path of the activity as if the defective action had ended normally. [no] Create exam instructions Print exam instructions [yes] paper jam paper tray empty Resolve paper jam <<decisionInput>> Sufficient copies printed? Add paper Fetch paper Insert paper DO
Transcribed Image Text:EH - Concept - If an error occurs during the execution of an action, the execution is terminated. In this situation, the action will not deliver the expected output. . But, if an action has an exception handler (EH) for a specific error situation, this EH is activated when an exception occurs. Using an EH, you can define how the system has to react in a specific error situation - The EH replaces the action where the error occurred . If the error e occurs, then: . I All tokens in Action A are deleted The Exception-Handler is activated The Exception-Handler is executed instead of Action A Execution then continues regularly Exception- Handler Action A EH - Example Following figure shows 2 examples for handling exceptions: If a paper jam occurs during printing, printing can continue once the paper jam has been removed. If there is no paper in the printer, paper must be inserted for printing to continue until sufficient copies of the exam instructions have been printed. After all errors are handled, then the sequence can continues as the regular execution/path of the activity as if the defective action had ended normally. [no] Create exam instructions Print exam instructions [yes] paper jam paper tray empty Resolve paper jam <<decisionInput>> Sufficient copies printed? Add paper Fetch paper Insert paper DO
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