Package org.openjdk.jol.info

Class GraphLayout

  • public class GraphLayout
extends java.lang.Object
    Holds the object graph layout info.

    • Field Detail

      • description

        private final java.lang.String description

      • processedHisto

        private volatile boolean processedHisto

      • classes

        private java.util.Set<java.lang.Class<?>> classes

      • classSizes

        private Multiset<java.lang.Class<?>> classSizes

      • classCounts

        private Multiset<java.lang.Class<?>> classCounts

      • processedAddresses

        private volatile boolean processedAddresses

      • addresses

        private java.util.Map<java.lang.Long,​GraphPathRecord> addresses

      • minAddress

        private long minAddress

      • maxAddress

        private long maxAddress

      • addressTries

        private int addressTries

      • addressStable

        private boolean addressStable

      • processedTotals

        private volatile boolean processedTotals

      • totalCount

        private long totalCount

      • totalSize

        private long totalSize

    • Constructor Detail

      • GraphLayout

        public GraphLayout​(java.lang.Object... roots)

    • Method Detail

      • parseInstance

        public static GraphLayout parseInstance​(java.lang.Object... roots)
        Parse the object graph starting from the given instance.
        Parameters:
        roots - root instances to start from
        Returns:
        object graph

      • ensureProcessedAddresses

        private void ensureProcessedAddresses()

      • subtract

        public GraphLayout subtract​(GraphLayout another)
        Subtract another layout data from the current one. This method does not change the current data object, but produces another one. Note that the object identity is derived from object addresses: if some objects move, they will be treated as new/absent. You may want to quiesce the heap (possibly doing several back-to-back GCs) before taking the snapshots.
        Parameters:
        another - data object
        Returns:
        new data object, that contains the difference.

      • add

        public GraphLayout add​(GraphLayout another)
        Add another layout data to the current one. This method does not change the current data object, but produces another one. Note that the object identity is derived from object addresses: if some objects move, they will be treated as new. You may want to quiesce the heap (possibly doing several back-to-back GCs) before taking the snapshots.
        Parameters:
        another - data object
        Returns:
        new data object, that contains the union.

      • ensureProcessedHisto

        private void ensureProcessedHisto()

      • getClassSizes

        public Multiset<java.lang.Class<?>> getClassSizes()
        Answer the class sizes.
        Returns:
        class sizes multiset

      • getClassCounts

        public Multiset<java.lang.Class<?>> getClassCounts()
        Answer the class counts
        Returns:
        class counts multiset

      • getClasses

        public java.util.Set<java.lang.Class<?>> getClasses()
        Answer the set of observed classes
        Returns:
        observed classes set

      • ensureProcessedTotals

        private void ensureProcessedTotals()

      • totalCount

        public long totalCount()
        Answer the total instance count
        Returns:
        total instance count

      • totalSize

        public long totalSize()
        Answer the total instance footprint
        Returns:
        total instance footprint, bytes

      • startAddress

        public long startAddress()
        Answer the starting address of observed memory chunk
        Returns:
        starting address

      • endAddress

        public long endAddress()
        Answer the ending address of observed memory chunk
        Returns:
        ending address

      • addresses

        public java.util.SortedSet<java.lang.Long> addresses()
        Answer the set of addresses for the discovered objects
        Returns:
        sorted set of addresses
        See Also:
        record(long)

      • record

        public GraphPathRecord record​(long address)
        Get the object descriptor for the given address
        Parameters:
        address - address
        Returns:
        object descriptor

      • toFootprint

        public java.lang.String toFootprint()
        Get the stringly representation of footprint table
        Returns:
        footprint table

      • toPrintable

        public java.lang.String toPrintable()
        Get the stringly representation of object graph
        Returns:
        linearized text form of object graph

      • toImage

        public void toImage​(java.lang.String fileName)
             throws java.io.IOException
        Put the graphical representation of object graph into the file.
        Parameters:
        fileName - filename
        Throws:
        java.io.IOException - when I/O fails