Log Filter Service

The Log Bundle provides the Log Filter Service for filtering available log entries.

Overview

The Log Filter Service, available under the com.prosyst.mbs.services.log.LogFilter interface name, provides methods for getting log entries by using a filter.

There are two methods for filtered retrieval of log entries:

• getLogsById filters logs by bundle ID. Using this method is helpful when you need to watch the behavior of a concrete bundle. The method returns the log entries logged by the specified bundle, sorted by time (the first entry returned is the one logged most recently).
• getLogsByTime filters logs by user–specified period of time given in milliseconds. Thus you can watch the behavior of all bundles within a period of time.

Registering Bundle

The service is registered by OSGi Log Bundle.

Using the Log Filter Service

The example below shows the usage of getLogsByTime method for filtered retrieval of log entries.

Listing 1. Using the Log Filter Service.

import com.prosyst.mbs.services.log.*;  

                             . . .
  private LogFilter logFilter;

                             . . .
  public void filter(){

    // Gets the current time in milliseconds
    long time = System.currentTimeMillis();
    Enumeration enum;
    LogEntry logEntry;

    // Puts filtered logs in an enumeration
    enum = logFilter.getLogsByTime(0,time);  
    
    while(enum.hasMoreElements()) {
      logEntry = (LogEntry)enum.nextElement();

      // Prints log entries
      System.out.println("Log Filter Entry: " + logEntry.getMessage());
    }
  }