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////////////////////////////////////////////////////////////////////////////
//
// Copyright (c) 2010-2021 60East Technologies Inc., All Rights Reserved.
//
// This computer software is owned by 60East Technologies Inc. and is
// protected by U.S. copyright laws and other laws and by international
// treaties. This computer software is furnished by 60East Technologies
// Inc. pursuant to a written license agreement and may be used, copied,
// transmitted, and stored only in accordance with the terms of such
// license agreement and with the inclusion of the above copyright notice.
// This computer software or any other copies thereof may not be provided
// or otherwise made available to any other person.
//
// U.S. Government Restricted Rights. This computer software: (a) was
// developed at private expense and is in all respects the proprietary
// information of 60East Technologies Inc.; (b) was not developed with
// government funds; (c) is a trade secret of 60East Technologies Inc.
// for all purposes of the Freedom of Information Act; and (d) is a
// commercial item and thus, pursuant to Section 12.212 of the Federal
// Acquisition Regulations (FAR) and DFAR Supplement Section 227.7202,
// Government's use, duplication or disclosure of the computer software
// is subject to the restrictions set forth by 60East Technologies Inc..
//
////////////////////////////////////////////////////////////////////////////
package com.crankuptheamps.client;
import com.crankuptheamps.client.fields.Field;
import java.io.IOException;
import java.util.Arrays;
import com.crankuptheamps.client.BlockPublishStore.ByteSequence;
/**
* ArrayStoreBuffer is a simple wrapper for a java array that maintains position.
* Very similar to the {@link MemoryStoreBuffer}, but instead of using a ByteBuffer,
* it just uses an array directly. Resize may be a tad more expensive, but
* steady-state latencies are significantly lower.
*/
public class ArrayStoreBuffer implements BlockPublishStore.Buffer
{
byte[] _buf = null;
volatile int _pos = 0;
Store _store = null;
/**
* Gets the back buffer.
* @return The end buffer.
*/
public byte[] getBuffer() { return _buf; }
/**
* Gets the size of the back buffer.
* @return Length of the buffer.
* @throws IOException Not thrown from this implementation.
*/
public long getSize() throws IOException
{
return _buf==null?0:_buf.length;
}
/**
* Sets the size of the back buffer.
* @param newSize The number to be set as the new buffer size.
* @throws IOException Not thrown from this implementation.
*/
public void setSize(long newSize) throws IOException
{
byte[] oldBuf = _buf;
if(oldBuf == null || newSize > oldBuf.length)
{
byte[] newBuf = new byte[(int)newSize];
if(oldBuf != null && oldBuf.length > 0)
{
System.arraycopy(oldBuf, 0, newBuf, 0, oldBuf.length);
}
_buf = newBuf;
}
}
/**
* Gets the current position in the buffer.
* @return The current position.
* @throws IOException Not thrown from this implementation.
*/
public long getPosition() throws IOException
{
return _pos;
}
/**
* Sets the current position in the buffer.
* @param position The current position to set.
* @throws IOException Not thrown from this implementation.
*/
public void setPosition(long position) throws IOException
{
_pos = (int)position;
}
/**
* Writes the byte into the buffer.
* @param b The byte to place in the buffer.
* @throws IOException Not thrown from this implementation.
*/
public void putByte(byte b) throws IOException
{
_buf[_pos++] = b;
}
/**
* Gets the byte from the buffer.
* @return The byte from the buffer.
* @throws IOException Not thrown from this implementation.
*/
public byte getByte() throws IOException
{
return _buf[_pos++];
}
/**
* Writes the integer into the buffer.
* @param i The integer to place in the buffer.
* @throws IOException Not thrown from this implementation.
*/
public void putInt(int i) throws IOException
{
_buf[_pos++] = (byte)((i & 0xFF000000) >> 24);
_buf[_pos++] = (byte)((i & 0xFF0000) >> 16);
_buf[_pos++] = (byte)((i & 0xFF00) >> 8);
_buf[_pos++] = (byte)(i & 0xFF);
}
/**
* Puts the integer into the buffer.
* @param position The position in the buffer to place the integer.
* @param i The integer to place in the buffer.
* @throws IOException Not thrown from this implementation.
*/
public void putInt(long position, int i) throws IOException
{
int pos = (int) position;
_buf[pos++] = (byte)((i & 0xFF000000) >> 24);
_buf[pos++] = (byte)((i & 0xFF0000) >> 16);
_buf[pos++] = (byte)((i & 0xFF00) >> 8);
_buf[pos] = (byte)(i & 0xFF);
}
/**
* Gets the integer from the buffer.
* @return The integer from the buffer.
* @throws IOException Not thrown from this implementation.
*/
public int getInt() throws IOException
{
int result = _buf[_pos+3] & 0xff |
((_buf[_pos+2]&0xff) << 8) |
((_buf[_pos+1]&0xff) << 16) |
((_buf[_pos+0]&0xff) << 24);
_pos += 4;
return result;
}
/**
* Gets the integer from the buffer.
* @param position The position in the buffer where the integer should begin.
* @return The integer from the buffer.
* @throws IOException Not thrown from this implementation.
*/
public int getInt(long position) throws IOException
{
int pos = (int)position;
return ( _buf[pos+3] & 0xff |
((_buf[pos+2]&0xff) << 8) |
((_buf[pos+1]&0xff) << 16) |
((_buf[pos+0]&0xff) << 24));
}
/**
* Writes the long into the buffer.
* @param l The long to be placed in the buffer.
* @throws IOException Not thrown from this implementation.
*/
public void putLong(long l) throws IOException
{
_buf[_pos++] = (byte)((l & 0xFF00000000000000L) >> 56);
_buf[_pos++] = (byte)((l & 0xFF000000000000L) >> 48);
_buf[_pos++] = (byte)((l & 0xFF0000000000L) >> 40);
_buf[_pos++] = (byte)((l & 0xFF00000000L) >> 32);
_buf[_pos++] = (byte)((l & 0xFF000000L) >> 24);
_buf[_pos++] = (byte)((l & 0xFF0000L) >> 16);
_buf[_pos++] = (byte)((l & 0xFF00L) >> 8);
_buf[_pos++] = (byte)(l & 0xFFL);
}
/**
* Writes the long into the buffer.
* @param position The position where the long should be placed in the buffer.
* @param l The long to be placed in the buffer.
* @throws IOException Not thrown from this implementation.
*/
public void putLong(long position, long l) throws IOException
{
int pos = (int) position;
_buf[pos++] = (byte)((l & 0xFF00000000000000L) >> 56);
_buf[pos++] = (byte)((l & 0xFF000000000000L) >> 48);
_buf[pos++] = (byte)((l & 0xFF0000000000L) >> 40);
_buf[pos++] = (byte)((l & 0xFF00000000L) >> 32);
_buf[pos++] = (byte)((l & 0xFF000000L) >> 24);
_buf[pos++] = (byte)((l & 0xFF0000L) >> 16);
_buf[pos++] = (byte)((l & 0xFF00L) >> 8);
_buf[pos] = (byte)(l & 0xFFL);
}
/**
* Gets the long from the buffer.
* @return The long from the buffer.
* @throws IOException Not thrown from this implementation.
*/
public long getLong() throws IOException
{
long result = _buf[_pos+7] & 0xff |
((long)(_buf[_pos+6]&0xff) << 8) |
((long)(_buf[_pos+5]&0xff) << 16) |
((long)(_buf[_pos+4]&0xff) << 24) |
((long)(_buf[_pos+3]&0xff) << 32) |
((long)(_buf[_pos+2]&0xff) << 40) |
((long)(_buf[_pos+1]&0xff) << 48) |
((long)(_buf[_pos+0]&0xff) << 56);
_pos += 8;
return result;
}
/**
* Writes a series of bytes at the current position, taken from the specified {@link BlockPublishStore.ByteSequence}.
* @param bytes The series of bytes to write at the current position.
* @throws IOException Not thrown from this implementation.
*/
public void putBytes(ByteSequence bytes) throws IOException
{
if (bytes.array == null || bytes.len == 0) return;
System.arraycopy(bytes.array, (int)bytes.offset, _buf, _pos, (int)bytes.len);
_pos += bytes.len;
}
/**
* Gets the series of bytes at the current position by placing them into the provided
* {@link BlockPublishStore.ByteSequence} object.
* @param outBytes The provided ByteSequence object.
* @throws IOException Not thrown from this implementation.
*/
public void getBytes(ByteSequence outBytes) throws IOException
{
if (outBytes.len == 0) return;
outBytes.array = _buf;
outBytes.offset = _pos;
_pos += outBytes.len;
}
/**
* Writes a series of bytes at the current position, taken from a byte array.
* @param buffer The buffer containing a series of bytes.
* @param position The position in the buffer where the series of bytes are located.
* @param length The length of the byte buffer.
* @throws IOException Not thrown from this implementation.
*/
public void putBytes(byte[] buffer, long position, long length) throws IOException
{
if (buffer == null || length == 0) return;
System.arraycopy(buffer, (int)position, _buf, _pos, (int)length);
_pos += length;
}
/**
* Gets the series of bytes at the current position, this is done by copying them into a {@link Field} object.
* @param outField The Field object used to copy the byte sequence.
* @param length The length of the Field object.
* @throws IOException Not thrown from this implementation.
*/
public void getBytes(Field outField, int length) throws IOException
{
outField.length = length;
if (outField.length == 0)
{
outField.buffer = null;
outField.position = 0;
}
else
{
outField.buffer = _buf;
outField.position = _pos;
_pos += outField.length;
}
}
/**
* Sets the buffer, offset, and length to 0.
* @param offset The offset to set as 0.
* @param length The length to set as 0.
* @throws IOException Not thrown from this implementation.
*/
public void zero(long offset, int length) throws IOException
{
Arrays.fill(_buf, (int)offset, (int)offset+length, (byte)0);
}
public void close()
{
_buf = null;
_store = null;
_pos = -1;
}
}
