Class ImageRefProfiler

  • All Implemented Interfaces:
    java.lang.AutoCloseable

    public class ImageRefProfiler
    extends java.lang.Object
    implements java.lang.AutoCloseable
    ImageRef memory profiler. ImageRefs are reference-counted. If references aren't correctly released for whatever reason, the image memory will leak. Leaking memory over time may cause out-of-memory crashes and must be avoided. The profiler can return basic and detailed information about all currently alive ImageRefs, that can be useful to track leaking ImageRefs or to confirm that there are no leaks.
    • Constructor Detail

      • ImageRefProfiler

        public ImageRefProfiler()
    • Method Detail

      • makeSnapshot

        public static ImageRefPoolSnapshot makeSnapshot()
        Returns a snapshot of all alive ImageRefs. The snapshot contains a list of ImageRefs with information such as in-memory size. If detailed profiling is enabled (by calling enableDetailedProfiling beforehand), the profile will contain additional information such as the source from which each ImageRef has been created.
        Returns:
        The snapshot of all alive ImageRefs.
      • enableDetailedProfiling

        public static void enableDetailedProfiling()
        After the function is called, ImageRefs will store additional information, such as source from which they were created. This information may be important when trying to understand a profile. This function must be called BEFORE the first ImageRef is created, otherwise details may be lost.
      • diff

        public static ImageRefPoolSnapshotsDiff diff​(ImageRefPoolSnapshot firstSnapshot,
                                                     ImageRefPoolSnapshot secondSnapshot)
        Computes difference between two snapshots. To confirm that a particular operation doesn't leak, take a snapshot before and after the operation, and check that the diff doesn't contain any unexpected new ImageRefs.
        Parameters:
        firstSnapshot - Snapshot that was taken earlier
        secondSnapshot - Snapshot that was taken later
        Returns:
        Difference between two snapshots
      • close

        public void close()
        Closes native resources held by the object.
        Specified by:
        close in interface java.lang.AutoCloseable
      • finalize

        protected void finalize()
                         throws java.lang.Throwable
        Overrides:
        finalize in class java.lang.Object
        Throws:
        java.lang.Throwable