oshi.util.platform.windows.PerfCounterQueryHandler

@NotThreadSafe public final class PerfCounterQueryHandler extends Object implements AutoCloseable

Utility to handle Performance Counter Queries

This class is not thread safe. Each query handler instance should only be used in a single thread, preferably in a try-with-resources block.

Constructor Details
- PerfCounterQueryHandler
  
  public PerfCounterQueryHandler()
Method Details
- addCounterToQuery
  
  public boolean addCounterToQuery(PerfDataUtil.PerfCounter counter)
  
  Begin monitoring a Performance Data counter.
  
  Parameters:
  
  counter - A PerfCounter object.
  
  Returns:
  
  True if the counter was successfully added to the query.
- removeCounterFromQuery
  
  public boolean removeCounterFromQuery(PerfDataUtil.PerfCounter counter)
  
  Stop monitoring a Performance Data counter.
  
  Parameters:
  
  counter - A PerfCounter object
  
  Returns:
  
  True if the counter was successfully removed.
- removeAllCounters
  
  public void removeAllCounters()
  
  Stop monitoring all Performance Data counters and release their resources
- updateQuery
  
  public long updateQuery()
  
  Update all counters on this query.
  
  Returns:
  
  The timestamp for the update of all the counters, in milliseconds since the epoch, or 0 if the update failed
- queryCounter
  
  public long queryCounter(PerfDataUtil.PerfCounter counter)
  
  Query the raw counter value of a Performance Data counter. Further mathematical manipulation/conversion is left to the caller.
  
  Parameters:
  
  counter - The counter to query
  
  Returns:
  
  The raw value of the counter
- close
  
  public void close()
  
  Specified by:
  
  close in interface AutoCloseable

Class PerfCounterQueryHandler

Constructor Summary