andreacavalli/netty-incubator-buffer-api
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Make ByteCursors from CompositeBuf slightly faster

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This commit is contained in:
Chris Vest 2020-12-07 16:00:45 +01:00
parent a7701c04b5
commit 4960e8b3e7
1 changed files with 62 additions and 31 deletions
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93
src/main/java/io/netty/buffer/api/CompositeBuf.java
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@ -329,25 +329,31 @@ final class CompositeBuf extends RcSupport<Buf, CompositeBuf> implements Buf {
int index = fromOffset;
final int end = fromOffset + length;
int bufferIndex = startBufferIndex;
int initOffset = startCursor.currentOffset();
ByteCursor cursor = startCursor;
long longValue = -1;
byte byteValue = -1;
@Override
public boolean readLong() {
if (cursor.readLong()) {
longValue = cursor.getLong();
return true;
}
if (bytesLeft() >= Long.BYTES) {
if (cursor.readLong()) {
longValue = cursor.getLong();
index += Long.BYTES;
} else {
longValue = nextLongFromBytes(); // Leave index increments to 'readByte'
}
longValue = nextLongFromBytes();
return true;
}
return false;
}
private long nextLongFromBytes() {
if (cursor.bytesLeft() == 0) {
nextCursor();
if (cursor.readLong()) {
return cursor.getLong();
}
}
long val = 0;
for (int i = 0; i < 8; i++) {
readByte();
@ -364,20 +370,26 @@ final class CompositeBuf extends RcSupport<Buf, CompositeBuf> implements Buf {
@Override
public boolean readByte() {
if (index < end) {
if (!cursor.readByte()) {
bufferIndex++;
Buf nextBuf = bufs[bufferIndex];
cursor = nextBuf.openCursor(0, Math.min(nextBuf.capacity(), bytesLeft()));
cursor.readByte();
}
if (cursor.readByte()) {
byteValue = cursor.getByte();
return true;
}
if (bytesLeft() > 0) {
nextCursor();
cursor.readByte();
byteValue = cursor.getByte();
index++;
return true;
}
return false;
}
private void nextCursor() {
bufferIndex++;
Buf nextBuf = bufs[bufferIndex];
cursor = nextBuf.openCursor(0, Math.min(nextBuf.capacity(), bytesLeft()));
initOffset = 0;
}
@Override
public byte getByte() {
return byteValue;
@ -385,12 +397,15 @@ final class CompositeBuf extends RcSupport<Buf, CompositeBuf> implements Buf {
@Override
public int currentOffset() {
int currOff = cursor.currentOffset();
index += currOff - initOffset;
initOffset = currOff;
return index;
}
@Override
public int bytesLeft() {
return end - index;
return end - currentOffset();
}
};
}
@ -415,25 +430,31 @@ final class CompositeBuf extends RcSupport<Buf, CompositeBuf> implements Buf {
int index = fromOffset;
final int end = fromOffset - length;
int bufferIndex = startBufferIndex;
int initOffset = startCursor.currentOffset();
ByteCursor cursor = startCursor;
long longValue = -1;
byte byteValue = -1;
@Override
public boolean readLong() {
if (cursor.readLong()) {
longValue = cursor.getLong();
return true;
}
if (bytesLeft() >= Long.BYTES) {
if (cursor.readLong()) {
index -= Long.BYTES;
longValue = cursor.getLong();
} else {
longValue = nextLongFromBytes(); // Leave index increments to 'readByte'
}
longValue = nextLongFromBytes();
return true;
}
return false;
}
private long nextLongFromBytes() {
if (cursor.bytesLeft() == 0) {
nextCursor();
if (cursor.readLong()) {
return cursor.getLong();
}
}
long val = 0;
for (int i = 0; i < 8; i++) {
readByte();
@ -450,21 +471,28 @@ final class CompositeBuf extends RcSupport<Buf, CompositeBuf> implements Buf {
@Override
public boolean readByte() {
if (index > end) {
if (!cursor.readByte()) {
bufferIndex--;
Buf nextBuf = bufs[bufferIndex];
int length = Math.min(nextBuf.capacity(), bytesLeft());
cursor = nextBuf.openReverseCursor(nextBuf.capacity() - 1, length);
cursor.readByte();
}
if (cursor.readByte()) {
byteValue = cursor.getByte();
return true;
}
if (bytesLeft() > 0) {
nextCursor();
cursor.readByte();
byteValue = cursor.getByte();
index--;
return true;
}
return false;
}
private void nextCursor() {
bufferIndex--;
Buf nextBuf = bufs[bufferIndex];
int length = Math.min(nextBuf.capacity(), bytesLeft());
int offset = nextBuf.capacity() - 1;
cursor = nextBuf.openReverseCursor(offset, length);
initOffset = offset;
}
@Override
public byte getByte() {
return byteValue;
@ -472,12 +500,15 @@ final class CompositeBuf extends RcSupport<Buf, CompositeBuf> implements Buf {
@Override
public int currentOffset() {
int currOff = cursor.currentOffset();
index -= initOffset - currOff;
initOffset = currOff;
return index;
}
@Override
public int bytesLeft() {
return index - end;
return currentOffset() - end;
}
};
}