Package org.apache.cassandra.io.util

Class Memory

  • All Implemented Interfaces:
    java.lang.AutoCloseable, ReadableMemory
    Direct Known Subclasses:
    RefCountedMemory, SafeMemory
    public class Memory
extends java.lang.Object
implements java.lang.AutoCloseable, ReadableMemory
    An off-heap region of memory that must be manually free'd when no longer needed.

    • Field Summary

      Fields 
      Modifier and Type Field Description
      static java.nio.ByteBuffer[] NO_BYTE_BUFFERS  
      protected long peer  
      protected long size  

    • Constructor Summary

      Constructors 
      Modifier Constructor Description
      protected Memory​(long bytes)  
      protected Memory​(Memory copyOf)  

    • Method Summary

      All Methods Static Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      static Memory allocate​(long bytes)  
      java.nio.ByteBuffer asByteBuffer​(long offset, int length)  
      java.nio.ByteBuffer[] asByteBuffers​(long offset, long length)  
      protected void checkBounds​(long start, long end)  
      void close()  
      Memory copy​(long newSize)  
      boolean equals​(java.lang.Object o)  
      void free()  
      byte getByte​(long offset)  
      void getBytes​(long memoryOffset, byte[] buffer, int bufferOffset, int count)
      Transfers count bytes from Memory starting at memoryOffset to buffer starting at bufferOffset
      int getInt​(long offset)  
      long getLong​(long offset)  
      void put​(long trgOffset, Memory memory, long srcOffset, long size)  
      void setByte​(long offset, byte b)  
      void setByteBuffer​(java.nio.ByteBuffer buffer, long offset, int length)  
      void setBytes​(long memoryOffset, byte[] buffer, int bufferOffset, int count)
      Transfers count bytes from buffer to Memory
      void setBytes​(long memoryOffset, java.nio.ByteBuffer buffer)  
      void setInt​(long offset, int l)  
      void setLong​(long offset, long l)  
      void setMemory​(long offset, long bytes, byte b)  
      void setShort​(long offset, short l)  
      long size()  
      java.lang.String toString()  
      protected static java.lang.String toString​(long peer, long size)  

      • Methods inherited from class java.lang.Object

        clone, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

    • Field Detail

      • NO_BYTE_BUFFERS

        public static final java.nio.ByteBuffer[] NO_BYTE_BUFFERS

      • peer

        protected long peer

      • size

        protected final long size

    • Constructor Detail

      • Memory

        protected Memory​(long bytes)

      • Memory

        protected Memory​(Memory copyOf)

    • Method Detail

      • allocate

        public static Memory allocate​(long bytes)

      • setByte

        public void setByte​(long offset,
                    byte b)

      • setMemory

        public void setMemory​(long offset,
                      long bytes,
                      byte b)

      • setLong

        public void setLong​(long offset,
                    long l)

      • setInt

        public void setInt​(long offset,
                   int l)

      • setShort

        public void setShort​(long offset,
                     short l)

      • setBytes

        public void setBytes​(long memoryOffset,
                     java.nio.ByteBuffer buffer)

      • setBytes

        public void setBytes​(long memoryOffset,
                     byte[] buffer,
                     int bufferOffset,
                     int count)
        Transfers count bytes from buffer to Memory
        Parameters:
        memoryOffset - start offset in the memory
        buffer - the data buffer
        bufferOffset - start offset of the buffer
        count - number of bytes to transfer

      • getByte

        public byte getByte​(long offset)

      • getLong

        public long getLong​(long offset)

      • getInt

        public int getInt​(long offset)

      • getBytes

        public void getBytes​(long memoryOffset,
                     byte[] buffer,
                     int bufferOffset,
                     int count)
        Transfers count bytes from Memory starting at memoryOffset to buffer starting at bufferOffset
        Parameters:
        memoryOffset - start offset in the memory
        buffer - the data buffer
        bufferOffset - start offset of the buffer
        count - number of bytes to transfer

      • checkBounds

        @Inline
protected void checkBounds​(long start,
                           long end)

      • put

        public void put​(long trgOffset,
                Memory memory,
                long srcOffset,
                long size)

      • copy

        public Memory copy​(long newSize)

      • free

        public void free()

      • close

        public void close()
        Specified by:
        close in interface java.lang.AutoCloseable

      • size

        public long size()

      • equals

        public boolean equals​(java.lang.Object o)
        Overrides:
        equals in class java.lang.Object

      • asByteBuffers

        public java.nio.ByteBuffer[] asByteBuffers​(long offset,
                                           long length)
        Specified by:
        asByteBuffers in interface ReadableMemory

      • asByteBuffer

        public java.nio.ByteBuffer asByteBuffer​(long offset,
                                        int length)

      • setByteBuffer

        public void setByteBuffer​(java.nio.ByteBuffer buffer,
                          long offset,
                          int length)

      • toString

        public java.lang.String toString()
        Overrides:
        toString in class java.lang.Object

      • toString

        protected static java.lang.String toString​(long peer,
                                           long size)