RedisOutputStream.java的源码是什么
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package redis.clients.util; import java.io.*; import java.nio.charset.Charset; /** * The class implements a buffered output stream without synchronization * There are also special operations like in-place string encoding. * This stream fully ignore mark/reset and should not be used outside Jedis */ public final class RedisOutputStream extends FilterOutputStream { protected final byte buf[];//缓冲区 protected int count;//计数器 public static final Charset CHARSET = Charset.forName("UTF-8");//编码方式 public RedisOutputStream(OutputStream out) {//初始化 this(out, 8192); } public RedisOutputStream(OutputStream out, int size) {//初始化 super(out); if (size <= 0) { throw new IllegalArgumentException("Buffer size <= 0"); } buf = new byte[size]; } private void flushBuffer() throws IOException {//将所有字符都写出去 if (count > 0) { out.write(buf, 0, count); count = 0; } } public void write(int b) throws IOException {//写到缓冲区,满时执行缓冲区清除 buf[count++] = (byte) b; if (count == buf.length) { flushBuffer(); } } public void write(byte b[], int off, int len) throws IOException {//写到缓冲区 if (len >= buf.length) { flushBuffer(); out.write(b, off, len); } else { if (len >= buf.length - count) { flushBuffer(); } System.arraycopy(b, off, buf, count, len); count += len; } } public void writeAsciiCrLf(String in) throws IOException {//写到缓冲区 final int size = in.length(); for (int i = 0; i != size; ++i) { buf[count++] = (byte) in.charAt(i); if (count == buf.length) { flushBuffer(); } } writeCrLf(); } public static boolean isSurrogate(char ch) {//XXX return ch >= Character.MIN_SURROGATE && ch <= Character.MAX_SURROGATE; } public static int utf8Length (String str) {//utf8编码的长度 int strLen = str.length(), utfLen = 0; for(int i = 0; i != strLen; ++i) { char c = str.charAt(i); if (c < 0x80) { utfLen++; } else if (c < 0x800) { utfLen += 2; } else if (isSurrogate(c)) { i++; utfLen += 4; } else { utfLen += 3; } } return utfLen; } public void writeCrLf() throws IOException {//写到缓冲区里 if (2 >= buf.length - count) { flushBuffer(); } buf[count++] = '\r'; buf[count++] = '\n'; } public void writeUtf8CrLf(String str) throws IOException {//XXX int strLen = str.length(); int i; for (i = 0; i < strLen; i++) { char c = str.charAt(i); if (!(c < 0x80)) break; buf[count++] = (byte) c; if(count == buf.length) { flushBuffer(); } } for (; i < strLen; i++) { char c = str.charAt(i); if (c < 0x80) { buf[count++] = (byte) c; if(count == buf.length) { flushBuffer(); } } else if (c < 0x800) { if(2 < buf.length - count) { flushBuffer(); } buf[count++] = (byte)(0xc0 | (c >> 6)); buf[count++] = (byte)(0x80 | (c & 0x3f)); } else if (isSurrogate(c)) { if(4 < buf.length - count) { flushBuffer(); } int uc = Character.toCodePoint(c, str.charAt(i++)); buf[count++] = ((byte)(0xf0 | ((uc >> 18)))); buf[count++] = ((byte)(0x80 | ((uc >> 12) & 0x3f))); buf[count++] = ((byte)(0x80 | ((uc >> 6) & 0x3f))); buf[count++] = ((byte)(0x80 | (uc & 0x3f))); } else { if(3 < buf.length - count) { flushBuffer(); } buf[count++] =((byte)(0xe0 | ((c >> 12)))); buf[count++] =((byte)(0x80 | ((c >> 6) & 0x3f))); buf[count++] =((byte)(0x80 | (c & 0x3f))); } } writeCrLf(); } private final static int[] sizeTable = {9, 99, 999, 9999, 99999, 999999, 9999999, 99999999, 999999999, Integer.MAX_VALUE}; private final static byte[] DigitTens = { '0', '0', '0', '0', '0', '0', '0', '0', '0', '0', '1', '1', '1', '1', '1', '1', '1', '1', '1', '1', '2', '2', '2', '2', '2', '2', '2', '2', '2', '2', '3', '3', '3', '3', '3', '3', '3', '3', '3', '3', '4', '4', '4', '4', '4', '4', '4', '4', '4', '4', '5', '5', '5', '5', '5', '5', '5', '5', '5', '5', '6', '6', '6', '6', '6', '6', '6', '6', '6', '6', '7', '7', '7', '7', '7', '7', '7', '7', '7', '7', '8', '8', '8', '8', '8', '8', '8', '8', '8', '8', '9', '9', '9', '9', '9', '9', '9', '9', '9', '9', }; private final static byte[] DigitOnes = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', }; private final static byte[] digits = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z' }; public void writeIntCrLf(int value) throws IOException {//写一个整数 if (value < 0) { write('-'); value = -value; } int size = 0; while (value > sizeTable[size]) size++; size++; if (size >= buf.length - count) { flushBuffer(); } int q, r; int charPos = count + size; while (value >= 65536) { q = value / 100; r = value - ((q << 6) + (q << 5) + (q << 2)); value = q; buf[--charPos] = DigitOnes[r]; buf[--charPos] = DigitTens[r]; } for (; ;) { q = (value * 52429) >>> (16 + 3); r = value - ((q << 3) + (q << 1)); buf[--charPos] = digits[r]; value = q; if (value == 0) break; } count += size; writeCrLf(); } public void flush() throws IOException {//写完缓冲区,并且对out执行flush操作。 flushBuffer(); out.flush(); } }
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