netty-incubator-buffer-api/src/main/java/io/netty/buffer/api/CompositeBuf.java

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/*
* Copyright 2020 The Netty Project
*
* The Netty Project licenses this file to you under the Apache License,
* version 2.0 (the "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at:
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*/
2020-11-17 15:38:11 +01:00
package io.netty.buffer.api;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.util.Arrays;
import java.util.Objects;
import java.util.function.Consumer;
final class CompositeBuf extends RcSupport<Buf, CompositeBuf> implements Buf {
/**
* The max array size is JVM implementation dependant, but most seem to settle on {@code Integer.MAX_VALUE - 8}.
* We set the max composite buffer capacity to the same, since it would otherwise be impossible to create a
* non-composite copy of the buffer.
*/
private static final int MAX_CAPACITY = Integer.MAX_VALUE - 8;
private static final Drop<CompositeBuf> COMPOSITE_DROP = buf -> {
for (Buf b : buf.bufs) {
b.close();
}
buf.makeInaccessible();
};
private final Allocator allocator;
private final TornBufAccessors tornBufAccessors;
private final boolean isSendable;
private Buf[] bufs;
private int[] offsets; // The offset, for the composite buffer, where each constituent buffer starts.
private int capacity;
private int roff;
private int woff;
private int subOffset; // The next offset *within* a consituent buffer to read from or write to.
private ByteOrder order;
private boolean closed;
private boolean readOnly;
CompositeBuf(Allocator allocator, Buf[] bufs) {
this(allocator, true, bufs.clone(), COMPOSITE_DROP); // Clone prevents external modification of array.
}
private CompositeBuf(Allocator allocator, boolean isSendable, Buf[] bufs, Drop<CompositeBuf> drop) {
super(drop);
this.allocator = allocator;
this.isSendable = isSendable;
for (Buf buf : bufs) {
buf.acquire();
}
if (bufs.length > 0) {
ByteOrder targetOrder = bufs[0].order();
for (Buf buf : bufs) {
if (buf.order() != targetOrder) {
throw new IllegalArgumentException("Constituent buffers have inconsistent byte order.");
}
}
order = bufs[0].order();
boolean targetReadOnly = bufs[0].readOnly();
for (Buf buf : bufs) {
if (buf.readOnly() != targetReadOnly) {
throw new IllegalArgumentException("Constituent buffers have inconsistent read-only state.");
}
}
readOnly = targetReadOnly;
} else {
order = ByteOrder.nativeOrder();
}
this.bufs = bufs;
computeBufferOffsets();
tornBufAccessors = new TornBufAccessors(this);
}
private void computeBufferOffsets() {
if (bufs.length > 0) {
int woff = 0;
int roff = 0;
boolean woffMidpoint = false;
for (Buf buf : bufs) {
if (buf.writableBytes() == 0) {
woff += buf.capacity();
} else if (!woffMidpoint) {
woff += buf.writerOffset();
woffMidpoint = true;
} else if (buf.writerOffset() != 0) {
throw new IllegalArgumentException(
"The given buffers cannot be composed because they leave an unwritten gap: " +
Arrays.toString(bufs) + '.');
}
}
boolean roffMidpoint = false;
for (Buf buf : bufs) {
if (buf.readableBytes() == 0 && buf.writableBytes() == 0) {
roff += buf.capacity();
} else if (!roffMidpoint) {
roff += buf.readerOffset();
roffMidpoint = true;
} else if (buf.readerOffset() != 0) {
throw new IllegalArgumentException(
"The given buffers cannot be composed because they leave an unread gap: " +
Arrays.toString(bufs) + '.');
}
}
assert roff <= woff:
"The given buffers place the read offset ahead of the write offset: " + Arrays.toString(bufs) + '.';
// Commit computed offsets.
this.woff = woff;
this.roff = roff;
}
offsets = new int[bufs.length];
long cap = 0;
for (int i = 0; i < bufs.length; i++) {
offsets[i] = (int) cap;
cap += bufs[i].capacity();
}
if (cap > MAX_CAPACITY) {
throw new IllegalArgumentException(
"Combined size of the constituent buffers is too big. " +
"The maximum buffer capacity is " + MAX_CAPACITY + " (Interger.MAX_VALUE - 8), " +
"but the sum of the constituent buffer capacities was " + cap + '.');
}
capacity = (int) cap;
}
@Override
public String toString() {
return "Buf[roff:" + roff + ", woff:" + woff + ", cap:" + capacity + ']';
}
@Override
public Buf order(ByteOrder order) {
if (this.order != order) {
this.order = order;
for (Buf buf : bufs) {
buf.order(order);
}
}
return this;
}
@Override
public ByteOrder order() {
return order;
}
@Override
public int capacity() {
return capacity;
}
@Override
public int readerOffset() {
return roff;
}
@Override
public Buf readerOffset(int index) {
prepRead(index, 0);
int indexLeft = index;
for (Buf buf : bufs) {
buf.readerOffset(Math.min(indexLeft, buf.capacity()));
indexLeft = Math.max(0, indexLeft - buf.capacity());
}
roff = index;
return this;
}
@Override
public int writerOffset() {
return woff;
}
@Override
public Buf writerOffset(int index) {
checkWriteBounds(index, 0);
int indexLeft = index;
for (Buf buf : bufs) {
buf.writerOffset(Math.min(indexLeft, buf.capacity()));
indexLeft = Math.max(0, indexLeft - buf.capacity());
}
woff = index;
return this;
}
@Override
public Buf fill(byte value) {
for (Buf buf : bufs) {
buf.fill(value);
}
return this;
}
@Override
public long nativeAddress() {
return 0;
}
@Override
public Buf readOnly(boolean readOnly) {
for (Buf buf : bufs) {
buf.readOnly(readOnly);
}
this.readOnly = readOnly;
return this;
}
@Override
public boolean readOnly() {
return readOnly;
}
@Override
public Buf slice(int offset, int length) {
checkWriteBounds(offset, length);
if (offset < 0 || length < 0) {
throw new IllegalArgumentException(
"Offset and length cannot be negative, but offset was " +
offset + ", and length was " + length + '.');
}
Buf choice = (Buf) chooseBuffer(offset, 0);
Buf[] slices = null;
acquire(); // Increase reference count of the original composite buffer.
Drop<CompositeBuf> drop = obj -> {
close(); // Decrement the reference count of the original composite buffer.
COMPOSITE_DROP.drop(obj);
};
try {
if (length > 0) {
slices = new Buf[bufs.length];
int off = subOffset;
int cap = length;
int i;
for (i = searchOffsets(offset); cap > 0; i++) {
var buf = bufs[i];
int avail = buf.capacity() - off;
slices[i] = buf.slice(off, Math.min(cap, avail));
cap -= avail;
off = 0;
}
slices = Arrays.copyOf(slices, i);
} else {
// Specialize for length == 0, since we must slice from at least one constituent buffer.
slices = new Buf[] { choice.slice(subOffset, 0) };
}
return new CompositeBuf(allocator, false, slices, drop);
} catch (Throwable throwable) {
// We called acquire prior to the try-clause. We need to undo that if we're not creating a composite buffer:
close();
throw throwable;
} finally {
if (slices != null) {
for (Buf slice : slices) {
if (slice != null) {
slice.close(); // Ownership now transfers to the composite buffer.
}
}
}
}
}
@Override
public void copyInto(int srcPos, byte[] dest, int destPos, int length) {
copyInto(srcPos, (b, s, d, l) -> b.copyInto(s, dest, d, l), destPos, length);
}
@Override
public void copyInto(int srcPos, ByteBuffer dest, int destPos, int length) {
copyInto(srcPos, (b, s, d, l) -> b.copyInto(s, dest, d, l), destPos, length);
}
private void copyInto(int srcPos, CopyInto dest, int destPos, int length) {
if (length < 0) {
throw new IndexOutOfBoundsException("Length cannot be negative: " + length + '.');
}
if (srcPos < 0) {
throw indexOutOfBounds(srcPos, false);
}
if (srcPos + length > capacity) {
throw indexOutOfBounds(srcPos + length, false);
}
while (length > 0) {
var buf = (Buf) chooseBuffer(srcPos, 0);
int toCopy = Math.min(buf.capacity() - subOffset, length);
dest.copyInto(buf, subOffset, destPos, toCopy);
srcPos += toCopy;
destPos += toCopy;
length -= toCopy;
}
}
@FunctionalInterface
private interface CopyInto {
void copyInto(Buf src, int srcPos, int destPos, int length);
}
@Override
public void copyInto(int srcPos, Buf dest, int destPos, int length) {
if (length < 0) {
throw new IndexOutOfBoundsException("Length cannot be negative: " + length + '.');
}
if (srcPos < 0) {
throw indexOutOfBounds(srcPos, false);
}
if (srcPos + length > capacity) {
throw indexOutOfBounds(srcPos + length, false);
}
// Iterate in reverse to account for src and dest buffer overlap.
// todo optimise by delegating to constituent buffers.
var cursor = openReverseCursor(srcPos + length - 1, length);
ByteOrder prevOrder = dest.order();
// We read longs in BE, in reverse, so they need to be flipped for writing.
dest.order(ByteOrder.LITTLE_ENDIAN);
try {
while (cursor.readLong()) {
length -= Long.BYTES;
dest.setLong(destPos + length, cursor.getLong());
}
while (cursor.readByte()) {
dest.setByte(destPos + --length, cursor.getByte());
}
} finally {
dest.order(prevOrder);
}
}
@Override
public ByteCursor openCursor(int fromOffset, int length) {
if (fromOffset < 0) {
throw new IllegalArgumentException("The fromOffset cannot be negative: " + fromOffset + '.');
}
if (length < 0) {
throw new IllegalArgumentException("The length cannot be negative: " + length + '.');
}
if (capacity < fromOffset + length) {
throw new IllegalArgumentException("The fromOffset+length is beyond the end of the buffer: " +
"fromOffset=" + fromOffset + ", length=" + length + '.');
}
int startBufferIndex = searchOffsets(fromOffset);
int off = fromOffset - offsets[startBufferIndex];
Buf startBuf = bufs[startBufferIndex];
ByteCursor startCursor = startBuf.openCursor(off, Math.min(startBuf.capacity() - off, length));
return new ByteCursor() {
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) {
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();
val <<= 8;
val |= getByte();
}
return val;
}
@Override
public long getLong() {
return longValue;
}
@Override
public boolean readByte() {
if (cursor.readByte()) {
byteValue = cursor.getByte();
return true;
}
if (bytesLeft() > 0) {
nextCursor();
cursor.readByte();
byteValue = cursor.getByte();
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;
}
@Override
public int currentOffset() {
int currOff = cursor.currentOffset();
index += currOff - initOffset;
initOffset = currOff;
return index;
}
@Override
public int bytesLeft() {
return end - currentOffset();
}
};
}
@Override
public ByteCursor openReverseCursor(int fromOffset, int length) {
if (fromOffset < 0) {
throw new IllegalArgumentException("The fromOffset cannot be negative: " + fromOffset + '.');
}
if (length < 0) {
throw new IllegalArgumentException("The length cannot be negative: " + length + '.');
}
if (fromOffset - length < -1) {
throw new IllegalArgumentException("The fromOffset-length would underflow the buffer: " +
"fromOffset=" + fromOffset + ", length=" + length + '.');
}
int startBufferIndex = searchOffsets(fromOffset);
int off = fromOffset - offsets[startBufferIndex];
Buf startBuf = bufs[startBufferIndex];
ByteCursor startCursor = startBuf.openReverseCursor(off, Math.min(off + 1, length));
return new ByteCursor() {
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) {
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();
val <<= 8;
val |= getByte();
}
return val;
}
@Override
public long getLong() {
return longValue;
}
@Override
public boolean readByte() {
if (cursor.readByte()) {
byteValue = cursor.getByte();
return true;
}
if (bytesLeft() > 0) {
nextCursor();
cursor.readByte();
byteValue = cursor.getByte();
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;
}
@Override
public int currentOffset() {
int currOff = cursor.currentOffset();
index -= initOffset - currOff;
initOffset = currOff;
return index;
}
@Override
public int bytesLeft() {
return currentOffset() - end;
}
};
}
@Override
public void ensureWritable(int size, boolean allowCompaction) {
if (!isOwned()) {
throw new IllegalStateException("Buffer is not owned. Only owned buffers can call ensureWritable.");
}
if (size < 0) {
throw new IllegalArgumentException("Cannot ensure writable for a negative size: " + size + '.');
}
if (readOnly) {
throw bufferIsReadOnly();
}
if (writableBytes() >= size) {
// We already have enough space.
return;
}
if (allowCompaction && size <= roff) {
// Let's see if we can solve some or all of the requested size with compaction.
// We always compact as much as is possible, regardless of size. This amortizes our work.
int compactableBuffers = 0;
for (Buf buf : bufs) {
if (buf.capacity() != buf.readerOffset()) {
break;
}
compactableBuffers++;
}
if (compactableBuffers > 0) {
Buf[] compactable;
if (compactableBuffers < bufs.length) {
compactable = new Buf[compactableBuffers];
System.arraycopy(bufs, 0, compactable, 0, compactable.length);
System.arraycopy(bufs, compactable.length, bufs, 0, bufs.length - compactable.length);
System.arraycopy(compactable, 0, bufs, bufs.length - compactable.length, compactable.length);
} else {
compactable = bufs;
}
for (Buf buf : compactable) {
buf.reset();
}
computeBufferOffsets();
if (writableBytes() >= size) {
// Now we have enough space.
return;
}
}
}
long newSize = capacity() + (long) size;
Allocator.checkSize(newSize);
int growth = size - writableBytes();
Buf extension = bufs.length == 0? allocator.allocate(growth) : allocator.allocate(growth, order());
unsafeExtendWith(extension);
}
void extendWith(Buf extension) {
Objects.requireNonNull(extension, "Extension buffer cannot be null.");
if (!isOwned()) {
throw new IllegalStateException("This buffer cannot be extended because it is not in an owned state.");
}
if (extension == this) {
throw new IllegalArgumentException("This buffer cannot be extended with itself.");
}
if (bufs.length > 0 && extension.order() != order()) {
throw new IllegalArgumentException(
"This buffer uses " + order() + " byte order, and cannot be extended with " +
"a buffer that uses " + extension.order() + " byte order.");
}
if (bufs.length > 0 && extension.readOnly() != readOnly()) {
throw new IllegalArgumentException(
"This buffer is " + (readOnly? "read-only" : "writable") + ", " +
"and cannot be extended with a buffer that is " +
(extension.readOnly()? "read-only." : "writable."));
}
long newSize = capacity() + (long) extension.capacity();
Allocator.checkSize(newSize);
Buf[] restoreTemp = bufs; // We need this to restore our buffer array, in case offset computations fail.
try {
unsafeExtendWith(extension.acquire());
if (restoreTemp.length == 0) {
order = extension.order();
readOnly = extension.readOnly();
}
} catch (Exception e) {
bufs = restoreTemp;
throw e;
}
}
private void unsafeExtendWith(Buf extension) {
bufs = Arrays.copyOf(bufs, bufs.length + 1);
bufs[bufs.length - 1] = extension;
computeBufferOffsets();
}
@Override
public Buf bifurcate() {
if (!isOwned()) {
throw new IllegalStateException("Cannot bifurcate a buffer that is not owned.");
}
if (bufs.length == 0) {
// Bifurcating a zero-length buffer is trivial.
return new CompositeBuf(allocator, true, bufs, unsafeGetDrop()).order(order);
}
int i = searchOffsets(woff);
int off = woff - offsets[i];
Buf[] bifs = Arrays.copyOf(bufs, off == 0? i : 1 + i);
bufs = Arrays.copyOfRange(bufs, off == bufs[i].capacity()? 1 + i : i, bufs.length);
if (off > 0 && bifs.length > 0 && off < bifs[bifs.length - 1].capacity()) {
bifs[bifs.length - 1] = bufs[0].bifurcate();
}
computeBufferOffsets();
try {
var compositeBuf = new CompositeBuf(allocator, true, bifs, unsafeGetDrop());
compositeBuf.order = order; // Preserve byte order even if bifs array is empty.
return compositeBuf;
} finally {
// Drop our references to the buffers in the bifs array. They belong to the new composite buffer now.
for (Buf bif : bifs) {
bif.close();
}
}
}
@Override
public void compact() {
if (!isOwned()) {
throw new IllegalStateException("Buffer must be owned in order to compact.");
}
if (readOnly()) {
throw new IllegalStateException("Buffer must be writable in order to compact, but was read-only.");
}
int distance = roff;
if (distance == 0) {
return;
}
int pos = 0;
var oldOrder = order;
order = ByteOrder.BIG_ENDIAN;
try {
var cursor = openCursor();
while (cursor.readLong()) {
setLong(pos, cursor.getLong());
pos += Long.BYTES;
}
while (cursor.readByte()) {
setByte(pos, cursor.getByte());
pos++;
}
} finally {
order = oldOrder;
}
readerOffset(0);
writerOffset(woff - distance);
}
@Override
public int componentCount() {
int sum = 0;
for (Buf buf : bufs) {
sum += buf.componentCount();
}
return sum;
}
@Override
public int forEachReadable(Consumer<Component> consumer) {
checkReadBounds(readerOffset(), Math.max(1, readableBytes()));
int visited = 0;
for (Buf buf : bufs) {
if (buf.readableBytes() > 0) {
visited += buf.forEachReadable(consumer);
}
}
return visited;
}
// <editor-fold defaultstate="collapsed" desc="Primitive accessors.">
@Override
public byte readByte() {
return prepRead(Byte.BYTES).readByte();
}
@Override
public byte getByte(int roff) {
return prepRead(roff, Byte.BYTES).getByte(subOffset);
}
@Override
public int readUnsignedByte() {
return prepRead(Byte.BYTES).readUnsignedByte();
}
@Override
public int getUnsignedByte(int roff) {
return prepRead(roff, Byte.BYTES).getUnsignedByte(subOffset);
}
@Override
public Buf writeByte(byte value) {
prepWrite(Byte.BYTES).writeByte(value);
return this;
}
@Override
public Buf setByte(int woff, byte value) {
prepWrite(woff, Byte.BYTES).setByte(subOffset, value);
return this;
}
@Override
public Buf writeUnsignedByte(int value) {
prepWrite(Byte.BYTES).writeUnsignedByte(value);
return this;
}
@Override
public Buf setUnsignedByte(int woff, int value) {
prepWrite(woff, Byte.BYTES).setUnsignedByte(subOffset, value);
return this;
}
@Override
public char readChar() {
return prepRead(2).readChar();
}
@Override
public char getChar(int roff) {
return prepRead(roff, 2).getChar(subOffset);
}
@Override
public Buf writeChar(char value) {
prepWrite(2).writeChar(value);
return this;
}
@Override
public Buf setChar(int woff, char value) {
prepWrite(woff, 2).setChar(subOffset, value);
return this;
}
@Override
public short readShort() {
return prepRead(Short.BYTES).readShort();
}
@Override
public short getShort(int roff) {
return prepRead(roff, Short.BYTES).getShort(subOffset);
}
@Override
public int readUnsignedShort() {
return prepRead(Short.BYTES).readShort();
}
@Override
public int getUnsignedShort(int roff) {
return prepRead(roff, Short.BYTES).getUnsignedShort(subOffset);
}
@Override
public Buf writeShort(short value) {
prepWrite(Short.BYTES).writeShort(value);
return this;
}
@Override
public Buf setShort(int woff, short value) {
prepWrite(woff, Short.BYTES).setShort(subOffset, value);
return this;
}
@Override
public Buf writeUnsignedShort(int value) {
prepWrite(Short.BYTES).writeUnsignedShort(value);
return this;
}
@Override
public Buf setUnsignedShort(int woff, int value) {
prepWrite(woff, Short.BYTES).setUnsignedShort(subOffset, value);
return this;
}
@Override
public int readMedium() {
return prepRead(3).readMedium();
}
@Override
public int getMedium(int roff) {
return prepRead(roff, 3).getMedium(subOffset);
}
@Override
public int readUnsignedMedium() {
return prepRead(3).readMedium();
}
@Override
public int getUnsignedMedium(int roff) {
return prepRead(roff, 3).getMedium(subOffset);
}
@Override
public Buf writeMedium(int value) {
prepWrite(3).writeMedium(value);
return this;
}
@Override
public Buf setMedium(int woff, int value) {
prepWrite(woff, 3).setMedium(subOffset, value);
return this;
}
@Override
public Buf writeUnsignedMedium(int value) {
prepWrite(3).writeUnsignedMedium(value);
return this;
}
@Override
public Buf setUnsignedMedium(int woff, int value) {
prepWrite(woff, 3).setUnsignedMedium(subOffset, value);
return this;
}
@Override
public int readInt() {
return prepRead(Integer.BYTES).readInt();
}
@Override
public int getInt(int roff) {
return prepRead(roff, Integer.BYTES).getInt(subOffset);
}
@Override
public long readUnsignedInt() {
return prepRead(Integer.BYTES).readUnsignedInt();
}
@Override
public long getUnsignedInt(int roff) {
return prepRead(roff, Integer.BYTES).getUnsignedInt(subOffset);
}
@Override
public Buf writeInt(int value) {
prepWrite(Integer.BYTES).writeInt(value);
return this;
}
@Override
public Buf setInt(int woff, int value) {
prepWrite(woff, Integer.BYTES).setInt(subOffset, value);
return this;
}
@Override
public Buf writeUnsignedInt(long value) {
prepWrite(Integer.BYTES).writeUnsignedInt(value);
return this;
}
@Override
public Buf setUnsignedInt(int woff, long value) {
prepWrite(woff, Integer.BYTES).setUnsignedInt(subOffset, value);
return this;
}
@Override
public float readFloat() {
return prepRead(Float.BYTES).readFloat();
}
@Override
public float getFloat(int roff) {
return prepRead(roff, Float.BYTES).getFloat(subOffset);
}
@Override
public Buf writeFloat(float value) {
prepWrite(Float.BYTES).writeFloat(value);
return this;
}
@Override
public Buf setFloat(int woff, float value) {
prepWrite(woff, Float.BYTES).setFloat(subOffset, value);
return this;
}
@Override
public long readLong() {
return prepRead(Long.BYTES).readLong();
}
@Override
public long getLong(int roff) {
return prepRead(roff, Long.BYTES).getLong(subOffset);
}
@Override
public Buf writeLong(long value) {
prepWrite(Long.BYTES).writeLong(value);
return this;
}
@Override
public Buf setLong(int woff, long value) {
prepWrite(woff, Long.BYTES).setLong(subOffset, value);
return this;
}
@Override
public double readDouble() {
return prepRead(Double.BYTES).readDouble();
}
@Override
public double getDouble(int roff) {
return prepRead(roff, Double.BYTES).getDouble(subOffset);
}
@Override
public Buf writeDouble(double value) {
prepWrite(Double.BYTES).writeDouble(value);
return this;
}
@Override
public Buf setDouble(int woff, double value) {
prepWrite(woff, Double.BYTES).setDouble(subOffset, value);
return this;
}
// </editor-fold>
@Override
protected Owned<CompositeBuf> prepareSend() {
@SuppressWarnings("unchecked")
Send<Buf>[] sends = new Send[bufs.length];
try {
for (int i = 0; i < bufs.length; i++) {
sends[i] = bufs[i].send();
}
} catch (Throwable throwable) {
// Repair our bufs array.
for (int i = 0; i < sends.length; i++) {
if (sends[i] != null) {
try {
bufs[i] = sends[i].receive();
} catch (Exception e) {
throwable.addSuppressed(e);
}
}
}
throw throwable;
}
makeInaccessible();
return new Owned<CompositeBuf>() {
@Override
public CompositeBuf transferOwnership(Drop<CompositeBuf> drop) {
Buf[] received = new Buf[sends.length];
for (int i = 0; i < sends.length; i++) {
received[i] = sends[i].receive();
}
var composite = new CompositeBuf(allocator, true, received, drop);
composite.readOnly = readOnly;
drop.attach(composite);
return composite;
}
};
}
void makeInaccessible() {
capacity = 0;
roff = 0;
woff = 0;
closed = true;
}
@Override
protected IllegalStateException notSendableException() {
if (!isSendable) {
return new IllegalStateException(
"Cannot send() this buffer. This buffer might be a slice of another buffer.");
}
return super.notSendableException();
}
@Override
public boolean isOwned() {
return isSendable && super.isOwned() && allConstituentsAreOwned();
}
private boolean allConstituentsAreOwned() {
boolean result = true;
for (Buf buf : bufs) {
result &= buf.isOwned();
}
return result;
}
long readPassThrough() {
var buf = choosePassThroughBuffer(subOffset++);
assert buf != tornBufAccessors: "Recursive call to torn buffer.";
return buf.readUnsignedByte();
}
void writePassThrough(int value) {
var buf = choosePassThroughBuffer(subOffset++);
assert buf != tornBufAccessors: "Recursive call to torn buffer.";
buf.writeUnsignedByte(value);
}
long getPassThrough(int roff) {
var buf = chooseBuffer(roff, 1);
assert buf != tornBufAccessors: "Recursive call to torn buffer.";
return buf.getUnsignedByte(subOffset);
}
void setPassThrough(int woff, int value) {
var buf = chooseBuffer(woff, 1);
assert buf != tornBufAccessors: "Recursive call to torn buffer.";
buf.setUnsignedByte(subOffset, value);
}
private BufAccessors prepRead(int size) {
var buf = prepRead(roff, size);
roff += size;
return buf;
}
private BufAccessors prepRead(int index, int size) {
checkReadBounds(index, size);
return chooseBuffer(index, size);
}
private void checkReadBounds(int index, int size) {
if (index < 0 || woff < index + size) {
throw indexOutOfBounds(index, false);
}
}
private BufAccessors prepWrite(int size) {
var buf = prepWrite(woff, size);
woff += size;
return buf;
}
private BufAccessors prepWrite(int index, int size) {
checkWriteBounds(index, size);
return chooseBuffer(index, size);
}
private void checkWriteBounds(int index, int size) {
if (index < 0 || capacity < index + size) {
throw indexOutOfBounds(index, true);
}
}
private RuntimeException indexOutOfBounds(int index, boolean write) {
if (closed) {
return bufferIsClosed();
}
if (write && readOnly) {
return bufferIsReadOnly();
}
return new IndexOutOfBoundsException(
"Index " + index + " is out of bounds: [read 0 to " + woff + ", write 0 to " +
(capacity - 1) + "].");
}
private static IllegalStateException bufferIsClosed() {
return new IllegalStateException("This buffer is closed.");
}
private static IllegalStateException bufferIsReadOnly() {
return new IllegalStateException("This buffer is read-only.");
}
private BufAccessors chooseBuffer(int index, int size) {
int i = searchOffsets(index);
if (i == bufs.length) {
// This happens when the read/write offsets are parked 1 byte beyond the end of the buffer.
// In that case it should not matter what buffer is returned, because it shouldn't be used anyway.
return null;
}
int off = index - offsets[i];
Buf candidate = bufs[i];
if (off + size <= candidate.capacity()) {
subOffset = off;
return candidate;
}
subOffset = index;
return tornBufAccessors;
}
private BufAccessors choosePassThroughBuffer(int index) {
int i = searchOffsets(index);
return bufs[i];
}
private int searchOffsets(int index) {
int i = Arrays.binarySearch(offsets, index);
2020-11-17 15:25:26 +01:00
return i < 0? -(i + 2) : i;
}
// <editor-fold defaultstate="collapsed" desc="Torn buffer access.">
private static final class TornBufAccessors implements BufAccessors {
private final CompositeBuf buf;
private TornBufAccessors(CompositeBuf buf) {
this.buf = buf;
}
@Override
public byte readByte() {
throw new AssertionError("Method should not be used.");
}
@Override
public byte getByte(int roff) {
throw new AssertionError("Method should not be used.");
}
@Override
public int readUnsignedByte() {
throw new AssertionError("Method should not be used.");
}
@Override
public int getUnsignedByte(int roff) {
throw new AssertionError("Method should not be used.");
}
@Override
public Buf writeByte(byte value) {
throw new AssertionError("Method should not be used.");
}
@Override
public Buf setByte(int woff, byte value) {
throw new AssertionError("Method should not be used.");
}
@Override
public Buf writeUnsignedByte(int value) {
throw new AssertionError("Method should not be used.");
}
@Override
public Buf setUnsignedByte(int woff, int value) {
throw new AssertionError("Method should not be used.");
}
@Override
public char readChar() {
if (bigEndian()) {
return (char) (read() << 8 | read());
} else {
return (char) (read() | read() << 8);
}
}
@Override
public char getChar(int roff) {
if (bigEndian()) {
return (char) (read(roff) << 8 | read(roff + 1));
} else {
return (char) (read(roff) | read(roff + 1) << 8);
}
}
@Override
public Buf writeChar(char value) {
if (bigEndian()) {
write(value >>> 8);
write(value & 0xFF);
} else {
write(value & 0xFF);
write(value >>> 8);
}
return buf;
}
@Override
public Buf setChar(int woff, char value) {
if (bigEndian()) {
write(woff, value >>> 8);
write(woff + 1, value & 0xFF);
} else {
write(woff, value & 0xFF);
write(woff + 1, value >>> 8);
}
return buf;
}
@Override
public short readShort() {
if (bigEndian()) {
return (short) (read() << 8 | read());
} else {
return (short) (read() | read() << 8);
}
}
@Override
public short getShort(int roff) {
if (bigEndian()) {
return (short) (read(roff) << 8 | read(roff + 1));
} else {
return (short) (read(roff) | read(roff + 1) << 8);
}
}
@Override
public int readUnsignedShort() {
if (bigEndian()) {
return (int) (read() << 8 | read()) & 0xFFFF;
} else {
return (int) (read() | read() << 8) & 0xFFFF;
}
}
@Override
public int getUnsignedShort(int roff) {
if (bigEndian()) {
return (int) (read(roff) << 8 | read(roff + 1)) & 0xFFFF;
} else {
return (int) (read(roff) | read(roff + 1) << 8) & 0xFFFF;
}
}
@Override
public Buf writeShort(short value) {
if (bigEndian()) {
write(value >>> 8);
write(value & 0xFF);
} else {
write(value & 0xFF);
write(value >>> 8);
}
return buf;
}
@Override
public Buf setShort(int woff, short value) {
if (bigEndian()) {
write(woff, value >>> 8);
write(woff + 1, value & 0xFF);
} else {
write(woff, value & 0xFF);
write(woff + 1, value >>> 8);
}
return buf;
}
@Override
public Buf writeUnsignedShort(int value) {
if (bigEndian()) {
write(value >>> 8);
write(value & 0xFF);
} else {
write(value & 0xFF);
write(value >>> 8);
}
return buf;
}
@Override
public Buf setUnsignedShort(int woff, int value) {
if (bigEndian()) {
write(woff, value >>> 8);
write(woff + 1, value & 0xFF);
} else {
write(woff, value & 0xFF);
write(woff + 1, value >>> 8);
}
return buf;
}
@Override
public int readMedium() {
if (bigEndian()) {
return (int) (read() << 16 | read() << 8 | read());
} else {
return (int) (read() | read() << 8 | read() << 16);
}
}
@Override
public int getMedium(int roff) {
if (bigEndian()) {
return (int) (read(roff) << 16 | read(roff + 1) << 8 | read(roff + 2));
} else {
return (int) (read(roff) | read(roff + 1) << 8 | read(roff + 2) << 16);
}
}
@Override
public int readUnsignedMedium() {
if (bigEndian()) {
return (int) (read() << 16 | read() << 8 | read()) & 0xFFFFFF;
} else {
return (int) (read() | read() << 8 | read() << 16) & 0xFFFFFF;
}
}
@Override
public int getUnsignedMedium(int roff) {
if (bigEndian()) {
return (int) (read(roff) << 16 | read(roff + 1) << 8 | read(roff + 2)) & 0xFFFFFF;
} else {
return (int) (read(roff) | read(roff + 1) << 8 | read(roff + 2) << 16) & 0xFFFFFF;
}
}
@Override
public Buf writeMedium(int value) {
if (bigEndian()) {
write(value >>> 16);
write(value >>> 8 & 0xFF);
write(value & 0xFF);
} else {
write(value & 0xFF);
write(value >>> 8 & 0xFF);
write(value >>> 16);
}
return buf;
}
@Override
public Buf setMedium(int woff, int value) {
if (bigEndian()) {
write(woff, value >>> 16);
write(woff + 1, value >>> 8 & 0xFF);
write(woff + 2, value & 0xFF);
} else {
write(woff, value & 0xFF);
write(woff + 1, value >>> 8 & 0xFF);
write(woff + 2, value >>> 16);
}
return buf;
}
@Override
public Buf writeUnsignedMedium(int value) {
if (bigEndian()) {
write(value >>> 16);
write(value >>> 8 & 0xFF);
write(value & 0xFF);
} else {
write(value & 0xFF);
write(value >>> 8 & 0xFF);
write(value >>> 16);
}
return buf;
}
@Override
public Buf setUnsignedMedium(int woff, int value) {
if (bigEndian()) {
write(woff, value >>> 16);
write(woff + 1, value >>> 8 & 0xFF);
write(woff + 2, value & 0xFF);
} else {
write(woff, value & 0xFF);
write(woff + 1, value >>> 8 & 0xFF);
write(woff + 2, value >>> 16);
}
return buf;
}
@Override
public int readInt() {
if (bigEndian()) {
return (int) (read() << 24 | read() << 16 | read() << 8 | read());
} else {
return (int) (read() | read() << 8 | read() << 16 | read() << 24);
}
}
@Override
public int getInt(int roff) {
if (bigEndian()) {
return (int) (read(roff) << 24 | read(roff + 1) << 16 | read(roff + 2) << 8 | read(roff + 3));
} else {
return (int) (read(roff) | read(roff + 1) << 8 | read(roff + 2) << 16 | read(roff + 3) << 24);
}
}
@Override
public long readUnsignedInt() {
if (bigEndian()) {
return (read() << 24 | read() << 16 | read() << 8 | read()) & 0xFFFFFFFFL;
} else {
return (read() | read() << 8 | read() << 16 | read() << 24) & 0xFFFFFFFFL;
}
}
@Override
public long getUnsignedInt(int roff) {
if (bigEndian()) {
return (read(roff) << 24 | read(roff + 1) << 16 | read(roff + 2) << 8 | read(roff + 3)) & 0xFFFFFFFFL;
} else {
return (read(roff) | read(roff + 1) << 8 | read(roff + 2) << 16 | read(roff + 3) << 24) & 0xFFFFFFFFL;
}
}
@Override
public Buf writeInt(int value) {
if (bigEndian()) {
write(value >>> 24);
write(value >>> 16 & 0xFF);
write(value >>> 8 & 0xFF);
write(value & 0xFF);
} else {
write(value & 0xFF);
write(value >>> 8 & 0xFF);
write(value >>> 16 & 0xFF);
write(value >>> 24);
}
return buf;
}
@Override
public Buf setInt(int woff, int value) {
if (bigEndian()) {
write(woff, value >>> 24);
write(woff + 1, value >>> 16 & 0xFF);
write(woff + 2, value >>> 8 & 0xFF);
write(woff + 3, value & 0xFF);
} else {
write(woff, value & 0xFF);
write(woff + 1, value >>> 8 & 0xFF);
write(woff + 2, value >>> 16 & 0xFF);
write(woff + 3, value >>> 24);
}
return buf;
}
@Override
public Buf writeUnsignedInt(long value) {
if (bigEndian()) {
write((int) (value >>> 24));
write((int) (value >>> 16 & 0xFF));
write((int) (value >>> 8 & 0xFF));
write((int) (value & 0xFF));
} else {
write((int) (value & 0xFF));
write((int) (value >>> 8 & 0xFF));
write((int) (value >>> 16 & 0xFF));
write((int) (value >>> 24));
}
return buf;
}
@Override
public Buf setUnsignedInt(int woff, long value) {
if (bigEndian()) {
write(woff, (int) (value >>> 24));
write(woff + 1, (int) (value >>> 16 & 0xFF));
write(woff + 2, (int) (value >>> 8 & 0xFF));
write(woff + 3, (int) (value & 0xFF));
} else {
write(woff, (int) (value & 0xFF));
write(woff + 1, (int) (value >>> 8 & 0xFF));
write(woff + 2, (int) (value >>> 16 & 0xFF));
write(woff + 3, (int) (value >>> 24));
}
return buf;
}
@Override
public float readFloat() {
return Float.intBitsToFloat(readInt());
}
@Override
public float getFloat(int roff) {
return Float.intBitsToFloat(getInt(roff));
}
@Override
public Buf writeFloat(float value) {
return writeUnsignedInt(Float.floatToRawIntBits(value));
}
@Override
public Buf setFloat(int woff, float value) {
return setUnsignedInt(woff, Float.floatToRawIntBits(value));
}
@Override
public long readLong() {
if (bigEndian()) {
return read() << 56 | read() << 48 | read() << 40 | read() << 32 |
read() << 24 | read() << 16 | read() << 8 | read();
} else {
return read() | read() << 8 | read() << 16 | read() << 24 |
read() << 32 | read() << 40 | read() << 48 | read() << 56;
}
}
@Override
public long getLong(int roff) {
if (bigEndian()) {
return read(roff) << 56 | read(roff + 1) << 48 | read(roff + 2) << 40 | read(roff + 3) << 32 |
read(roff + 4) << 24 | read(roff + 5) << 16 | read(roff + 6) << 8 | read(roff + 7);
} else {
return read(roff) | read(roff + 1) << 8 | read(roff + 2) << 16 | read(roff + 3) << 24 |
read(roff + 4) << 32 | read(roff + 5) << 40 | read(roff + 6) << 48 | read(roff + 7) << 56;
}
}
@Override
public Buf writeLong(long value) {
if (bigEndian()) {
write((int) (value >>> 56));
write((int) (value >>> 48 & 0xFF));
write((int) (value >>> 40 & 0xFF));
write((int) (value >>> 32 & 0xFF));
write((int) (value >>> 24 & 0xFF));
write((int) (value >>> 16 & 0xFF));
write((int) (value >>> 8 & 0xFF));
write((int) (value & 0xFF));
} else {
write((int) (value & 0xFF));
write((int) (value >>> 8 & 0xFF));
write((int) (value >>> 16 & 0xFF));
write((int) (value >>> 24));
write((int) (value >>> 32));
write((int) (value >>> 40));
write((int) (value >>> 48));
write((int) (value >>> 56));
}
return buf;
}
@Override
public Buf setLong(int woff, long value) {
if (bigEndian()) {
write(woff, (int) (value >>> 56));
write(woff + 1, (int) (value >>> 48 & 0xFF));
write(woff + 2, (int) (value >>> 40 & 0xFF));
write(woff + 3, (int) (value >>> 32 & 0xFF));
write(woff + 4, (int) (value >>> 24 & 0xFF));
write(woff + 5, (int) (value >>> 16 & 0xFF));
write(woff + 6, (int) (value >>> 8 & 0xFF));
write(woff + 7, (int) (value & 0xFF));
} else {
write(woff, (int) (value & 0xFF));
write(woff + 1, (int) (value >>> 8 & 0xFF));
write(woff + 2, (int) (value >>> 16 & 0xFF));
write(woff + 3, (int) (value >>> 24));
write(woff + 4, (int) (value >>> 32));
write(woff + 5, (int) (value >>> 40));
write(woff + 6, (int) (value >>> 48));
write(woff + 7, (int) (value >>> 56));
}
return buf;
}
@Override
public double readDouble() {
return Double.longBitsToDouble(readLong());
}
@Override
public double getDouble(int roff) {
return Double.longBitsToDouble(getLong(roff));
}
@Override
public Buf writeDouble(double value) {
return writeLong(Double.doubleToRawLongBits(value));
}
@Override
public Buf setDouble(int woff, double value) {
return setLong(woff, Double.doubleToRawLongBits(value));
}
private boolean bigEndian() {
return buf.order() == ByteOrder.BIG_ENDIAN;
}
private long read() {
return buf.readPassThrough();
}
private void write(int value) {
buf.writePassThrough(value);
}
private long read(int roff) {
return buf.getPassThrough(roff);
}
private void write(int woff, int value) {
buf.setPassThrough(woff, value);
}
}
// </editor-fold>
}