Package org.apache.cassandra.utils.memory

Class MemoryUtil

  • public abstract class MemoryUtil
extends java.lang.Object

    • Constructor Summary

      Constructors 
      Constructor Description
      MemoryUtil()  

    • Method Summary

      All Methods Static Methods Concrete Methods 
      Modifier and Type Method Description
      static long allocate​(long size)  
      static java.nio.ByteBuffer duplicateDirectByteBuffer​(java.nio.ByteBuffer source, java.nio.ByteBuffer hollowBuffer)  
      static void free​(long peer)  
      static long getAddress​(java.nio.ByteBuffer buffer)  
      static java.lang.Object getAttachment​(java.nio.ByteBuffer instance)  
      static byte getByte​(long address)  
      static java.nio.ByteBuffer getByteBuffer​(long address, int length)  
      static java.nio.ByteBuffer getByteBuffer​(long address, int length, java.nio.ByteOrder order)  
      static void getBytes​(long address, byte[] buffer, int bufferOffset, int count)
      Transfers count bytes from Memory starting at memoryOffset to buffer starting at bufferOffset
      static java.nio.ByteBuffer getHollowByteBuffer()  
      static java.nio.ByteBuffer getHollowDirectByteBuffer()  
      static java.nio.ByteBuffer getHollowDirectByteBuffer​(java.nio.ByteOrder order)  
      static int getInt​(long address)  
      static int getIntByByte​(long address)  
      static long getLong​(long address)  
      static long getLongByByte​(long address)  
      static int getShort​(long address)  
      static int getShortByByte​(long address)  
      static boolean isExactlyDirect​(java.nio.ByteBuffer buffer)  
      static int pageSize()  
      static void putIntByByte​(long address, int value)  
      static void putLongByByte​(long address, long value)  
      static void setAttachment​(java.nio.ByteBuffer instance, java.lang.Object next)  
      static void setByte​(long address, byte b)  
      static void setByte​(long address, int count, byte b)  
      static void setByteBufferCapacity​(java.nio.ByteBuffer instance, int capacity)  
      static void setBytes​(byte[] src, int offset, long trg, long count)  
      static void setBytes​(long address, byte[] buffer, int bufferOffset, int count)
      Transfers count bytes from buffer to Memory
      static void setBytes​(long src, long trg, long count)  
      static void setBytes​(long address, java.nio.ByteBuffer buffer)  
      static void setDirectByteBuffer​(java.nio.ByteBuffer instance, long address, int length)  
      static void setInt​(long address, int l)  
      static void setLong​(long address, long l)  
      static void setShort​(long address, short s)  
      static java.nio.ByteBuffer sliceDirectByteBuffer​(java.nio.ByteBuffer source, java.nio.ByteBuffer hollowBuffer, int offset, int length)  

      • Methods inherited from class java.lang.Object

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

    • Constructor Detail

      • MemoryUtil

        public MemoryUtil()

    • Method Detail

      • pageSize

        public static int pageSize()

      • getAddress

        public static long getAddress​(java.nio.ByteBuffer buffer)

      • allocate

        public static long allocate​(long size)

      • free

        public static void free​(long peer)

      • setByte

        public static void setByte​(long address,
                           byte b)

      • setByte

        public static void setByte​(long address,
                           int count,
                           byte b)

      • setShort

        public static void setShort​(long address,
                            short s)

      • setInt

        public static void setInt​(long address,
                          int l)

      • setLong

        public static void setLong​(long address,
                           long l)

      • getByte

        public static byte getByte​(long address)

      • getShort

        public static int getShort​(long address)

      • getInt

        public static int getInt​(long address)

      • getLong

        public static long getLong​(long address)

      • getByteBuffer

        public static java.nio.ByteBuffer getByteBuffer​(long address,
                                                int length)

      • getByteBuffer

        public static java.nio.ByteBuffer getByteBuffer​(long address,
                                                int length,
                                                java.nio.ByteOrder order)

      • getHollowDirectByteBuffer

        public static java.nio.ByteBuffer getHollowDirectByteBuffer()

      • getHollowDirectByteBuffer

        public static java.nio.ByteBuffer getHollowDirectByteBuffer​(java.nio.ByteOrder order)

      • getHollowByteBuffer

        public static java.nio.ByteBuffer getHollowByteBuffer()

      • isExactlyDirect

        public static boolean isExactlyDirect​(java.nio.ByteBuffer buffer)

      • getAttachment

        public static java.lang.Object getAttachment​(java.nio.ByteBuffer instance)

      • setAttachment

        public static void setAttachment​(java.nio.ByteBuffer instance,
                                 java.lang.Object next)

      • duplicateDirectByteBuffer

        public static java.nio.ByteBuffer duplicateDirectByteBuffer​(java.nio.ByteBuffer source,
                                                            java.nio.ByteBuffer hollowBuffer)

      • sliceDirectByteBuffer

        public static java.nio.ByteBuffer sliceDirectByteBuffer​(java.nio.ByteBuffer source,
                                                        java.nio.ByteBuffer hollowBuffer,
                                                        int offset,
                                                        int length)

      • setDirectByteBuffer

        public static void setDirectByteBuffer​(java.nio.ByteBuffer instance,
                                       long address,
                                       int length)

      • setByteBufferCapacity

        public static void setByteBufferCapacity​(java.nio.ByteBuffer instance,
                                         int capacity)

      • getLongByByte

        public static long getLongByByte​(long address)

      • getIntByByte

        public static int getIntByByte​(long address)

      • getShortByByte

        public static int getShortByByte​(long address)

      • putLongByByte

        public static void putLongByByte​(long address,
                                 long value)

      • putIntByByte

        public static void putIntByByte​(long address,
                                int value)

      • setBytes

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

      • setBytes

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

      • setBytes

        public static void setBytes​(long src,
                            long trg,
                            long count)

      • setBytes

        public static void setBytes​(byte[] src,
                            int offset,
                            long trg,
                            long count)

      • getBytes

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