Module openj9.dtfj

Class HeapdumpReader

    • Constructor Detail

      • HeapdumpReader

        public HeapdumpReader​(File file,
                              PHDImage image)
                       throws IOException
        Create a new HeapdumpReader object from the given file. The file must be in Phd format. Image must be supplied to allow us to clean up streams when it is closed.
        Throws:
        IOException
      • HeapdumpReader

        protected HeapdumpReader​(ImageInputStream stream)
                          throws IOException
        Create a new HeapdumpReader object from the given stream. The file must be in Phd format.
        Throws:
        IOException
      • HeapdumpReader

        protected HeapdumpReader​(String filename)
                          throws IOException
        Create a new HeapdumpReader object from the given file. The file must be in Phd format.
        Throws:
        IOException
    • Method Detail

      • full_version

        public String full_version()
        Returns the full version for the JVM that created this heapdump.
      • version

        public int version()
        Returns the Phd version number. Recognized values are 4 and 5.
      • is64Bit

        public boolean is64Bit()
        Returns true if this is a 64-bit heap dump.
      • isJ9

        public boolean isJ9()
        Returns true if this is a J9 heap dump.
      • allObjectsHashed

        public boolean allObjectsHashed()
        Returns true all objects in this heap dump will have hashcodes set, regardless of the flags on the record.
      • totalObjects

        public int totalObjects()
        Returns the total number of objects in the dump.
      • totalRefs

        public int totalRefs()
        Returns the total number of references in the dump.
      • exitParse

        public void exitParse()
      • parse

        public boolean parse​(PortableHeapDumpListener listener)
                      throws Exception
        Parse the heapdump. This uses callbacks via the PortableHeapDumpListener interface. Any exceptions that the listener raises are propagated back.
        Returns:
        true if there is more data to parse
        Throws:
        Exception
      • close

        public void close()
      • releaseResources

        public void releaseResources()
      • main

        public static void main​(String[] args)
                         throws IOException
        This method just prints out the following info from the header:
        • is64Bit
        • phd version
        • full version
        • total objects
        • total refs
        Throws:
        IOException