Package io.micrometer.core.instrument

Interface LongTaskTimer

All Superinterfaces:
HistogramSupport, Meter
All Known Implementing Classes:
CumulativeHistogramLongTaskTimer, DefaultLongTaskTimer, NoopLongTaskTimer
public interface LongTaskTimer
extends Meter, HistogramSupport
A long task timer is used to track the total duration of all in-flight long-running tasks and the number of such tasks.

  • Method Details

    • builder

      static LongTaskTimer.Builder builder​(java.lang.String name)

    • builder

      static LongTaskTimer.Builder builder​(Timed timed)
      Create a timer builder from a Timed annotation.
      Parameters:
      timed - The annotation instance to base a new timer on.
      Returns:
      This builder.

    • recordCallable

      default <T> T recordCallable​(java.util.concurrent.Callable<T> f) throws java.lang.Exception
      Executes the callable f and records the time taken.
      Type Parameters:
      T - The return type of the Callable.
      Parameters:
      f - Function to execute and measure the execution time.
      Returns:
      The return value of f.
      Throws:
      java.lang.Exception - Any exception bubbling up from the callable.

    • record

      default <T> T record​(java.util.function.Supplier<T> f)
      Executes the callable f and records the time taken.
      Type Parameters:
      T - The return type of the Supplier.
      Parameters:
      f - Function to execute and measure the execution time.
      Returns:
      The return value of f.

    • record

      default void record​(java.util.function.Consumer<LongTaskTimer.Sample> f)
      Executes the runnable f and records the time taken.
      Parameters:
      f - Function to execute and measure the execution time with a reference to the timer id useful for looking up current duration.

    • record

      default void record​(java.lang.Runnable f)
      Executes the runnable f and records the time taken.
      Parameters:
      f - Function to execute and measure the execution time.

    • start

      LongTaskTimer.Sample start()
      Start keeping time for a task.
      Returns:
      A task id that can be used to look up how long the task has been running.

    • duration

      double duration​(java.util.concurrent.TimeUnit unit)
      Parameters:
      unit - The time unit to scale the duration to.
      Returns:
      The cumulative duration of all current tasks.

    • activeTasks

      int activeTasks()
      Returns:
      The current number of tasks being executed.

    • mean

      default double mean​(java.util.concurrent.TimeUnit unit)
      Parameters:
      unit - The base unit of time to scale the mean to.
      Returns:
      The distribution average for all recorded events.
      Since:
      1.5.1

    • max

      double max​(java.util.concurrent.TimeUnit unit)
      The amount of time the longest running task has been running
      Parameters:
      unit - The time unit to scale the max to.
      Returns:
      The maximum active task duration.
      Since:
      1.5.0

    • baseTimeUnit

      java.util.concurrent.TimeUnit baseTimeUnit()
      Returns:
      The base time unit of the long task timer to which all published metrics will be scaled
      Since:
      1.5.0

    • stop

      @Deprecated default long stop​(long task)
      Deprecated.
      Use LongTaskTimer.Sample.stop(). As of 1.5.0, this always returns -1 as tasks no longer have IDs.
      Mark a given task as completed.
      Parameters:
      task - Id for the task to stop. This should be the value returned from start().
      Returns:
      Duration for the task in nanoseconds. A -1 value will be returned for an unknown task.

    • duration

      @Deprecated default double duration​(long task, java.util.concurrent.TimeUnit unit)
      Deprecated.
      Use LongTaskTimer.Sample.duration(TimeUnit). As of 1.5.0, this always returns -1 as tasks no longer have IDs.
      The current duration for an active task.
      Parameters:
      task - Id for the task to stop. This should be the value returned from start().
      unit - The time unit to scale the duration to.
      Returns:
      Duration for the task. A -1 value will be returned for an unknown task.

    • measure

      default java.lang.Iterable<Measurement> measure()
      Description copied from interface: Meter
      Get a set of measurements. Should always return the same number of measurements and in the same order, regardless of the level of activity or the lack thereof.
      Specified by:
      measure in interface Meter
      Returns:
      The set of measurements that represents the instantaneous value of this meter.