pdf417 java api Improving logging performance in Java

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Improving logging performance
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Change the way you write messages When you re outputting messages, performance is slowed not only by the actual act of logging, but also by the construction of the message. For instance, look at the following sections of code that contain log statements:
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//first section public String getValue() { String returnValue = computeValue(); Logger.debug( "Final value of action: " + action + " is " + computeValue() ); return returnValue; }
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Compare that code to the following:
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//second statement public String getValue() { String returnValue = computeValue(); if( logger.isDebugEnabled() ) //check for level enabled { logger.debug("Final value of action " + action + " is " + returnValue ); //reuse computed value } return returnValue; }
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The first logging statement incurs the cost of an extra method call to computeValue() and string concatenation for the message even if the DEBUG level of the logging system is disabled. The second statement wisely reuses the returnValue object, and also constructs the log message only if the DEBUG level is enabled. Change your conversion patterns The PatternLayout class and ConversionPattern attribute comprise one of the most common configurations for log4j. However, many of the PatternLayout s formatting options can slow down your application. Table 8.3 lists the conversion characters you should use with caution and really only if performance is not an issue with your application. Change the layout class of an appender Change the layout class to the org.apache.log4j.SimpleLayout class. This layout class produces messages that include only the log level and message of the logging event:
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DEBUG my message from the application
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Logging
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Table 8.3 Conversion characters that degrade overall application performance. The process that creates the data produced by these characters is time-consuming. Repeatedly using these characters will eventually degrade the performance of your application to a noticeable degree. Character C d Data acquired Fully qualified classname Date of the logging event Performance problem The logging framework must walk the stack trace in order to build the classname of the object sending the message. If you use this character, use one of the log4j date formatters. For example, use ABSOLUTE, DATE or IISO8601 with a character like %d{ABSOLUTE}. The SimpleDateFormat from the JDK is much slower than the log4j formatters. See recipe 8.1 and log4j docs for more information. Same problems as using C . Suffers from having to walk the stack trace in order to gather information about class, file, and line number. Same problems as l . Same problems as l .
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F l L M
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Filename of the logging event Location information Line number Method name
The SimpleLayout class is the fastest of the layout classes.
Discussion
Regardless of the inherent speed of the log4j system, improving performance of your logging system relies on good programming practices and thoughtful message construction. For instance, the recipe shows a simple example of how reusing already acquired object values can decrease the time it takes to build a message. In addition, concatenating strings, converting primitive types to strings, and similar steps should be used only when necessary. If you must construct a message from various parts (which is common), you should at least test for the logger level to avoid unnecessary construction of the message. When using the PatternLayout class to format your messages, always be concerned with the performance degradation of certain conversion characters. Refer to table 8.3 for these characters, but keep in mind that although they can provide useful data, they do so at a high cost of time. Finally, if performance is your utmost objective, switch to the SimpleLayout class for formatting messages. It provides only a simple message structure, but it performs the fastest of the layout classes.
See also
8.1 Formatting log messages
Using logging to generate reports
8.3 Using logging to generate reports
Problem
Without modifying your logging framework, you would like to generate reports based on the messages output by the logger.
Background
In many production systems, the logging system is used to report critical errors to production support users. If your logging system outputs to a single file (or even multiple files), it can be difficult for users to work through a complex log file looking for particular messages. At specific times (for example, weekly or monthly), support personnel would like to summarize the errors or critical events of the previous cycle into a report.
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