1 / 6

ACS Course ACS logging in Java

ACS Course ACS logging in Java. H. Sommer. Plain JDK Logger with ACS behind the scenes. Application code (component or comp-client). getLogger. uses. ContainerServices#getLogger(). java.util.logging.Logger info(String msg) log(Level, String msg, Throwable). creates & configures.

cedric-wilson
Télécharger la présentation

ACS Course ACS logging in Java

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. ACS CourseACS logging in Java H. Sommer NRAO - Socorro July, 2004

  2. Plain JDK Loggerwith ACS behind the scenes Application code (component or comp-client) getLogger uses ContainerServices#getLogger() • java.util.logging.Logger • info(String msg) • log(Level, String msg, Throwable) creates & configures forwards messages remote ACS logging service Central log display VM-local ACS log handler forwards (XML) ALMA Common Software course

  3. Code Snippetsfrom jcontexmpl/HelloLampImpl m_logger.info("sayHello called..."); catch (Exception ex) { m_logger.log(Level.SEVERE, "ex in setLampBrightness impl", ex); } ALMA Common Software course

  4. JDK Logging API • Standard since JDK 1.4 • Easy API (you’ll only need the Logger class) • short methods with level names (finest, ... info, warning, severe) each taking a message string. • More powerful methods log, logp, for logging of values etc. • Flexible configuration for filtering and formatting (done by ACS) • Automatic retrieval of method names, line numbers etc (not guaranteed to work always for all VMs though…) • API: http://java.sun.com/j2se/1.4.2/docs/api/java/util/logging/package-summary.html • More info: http://java.sun.com/j2se/1.4.2/docs/guide/util/logging/overview.html ALMA Common Software course

  5. ACS logging configuration • Standard configuration file used: module acsjlog/src/almalogging.propertiesacsStartContainer –java frodoContainer • User may specify different properties file:abeansStart -endorsed -Djava.util.logging.config.file=/x/y/mylogging.properties frodoContainer • Suppress log levels below INFO (or any other level):alma.acs.logging.AcsLoggingHandler.level = INFO • Console output level controlled by separate property:java.util.logging.ConsoleHandler.level = INFO ALMA Common Software course

  6. Future of Java ACS Logging • The Logger returned from ContainerServices#getLogger is already configured with a “logger-namespace” unique for the Java component that requests it. • We could extend that namespace concept to group or filter log entries by the components that produced them • Log levels for suppressing unimportant messages could be set dynamically, e.g. by the Administrator Client; individually for all components and containers in the system… ALMA Common Software course

More Related