ByteChannel

Channel for asynchronous reading and writing of sequences of bytes. This is a buffered single-reader single-writer channel.

Read operations can be invoked concurrently with write operations, but multiple reads or multiple writes cannot be invoked concurrently with themselves. Exceptions are close and flush which can be invoked concurrently with any other operations and between themselves at any time.

Functions

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abstract fun attachJob(job: Job)
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expect abstract suspend fun awaitContent()

Suspend until the channel has bytes to read or gets closed. Throws exception if the channel was closed with an error.

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expect abstract suspend fun awaitFreeSpace()

Invokes block when at least 1 byte is available for write.

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expect abstract fun cancel(cause: Throwable?): Boolean

Close channel with optional cause cancellation. Unlike ByteWriteChannel.close that could close channel normally, cancel does always close with error so any operations on this channel will always fail and all suspensions will be resumed with exception.

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expect abstract fun close(cause: Throwable?): Boolean

Closes this channel with an optional exceptional cause. It flushes all pending write bytes (via flush). This is an idempotent operation -- repeated invocations of this function have no effect and return false.

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expect abstract suspend fun discard(max: Long): Long

Discard up to max bytes

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expect abstract fun flush()

Flushes all pending write bytes making them available for read.

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expect abstract suspend fun peekTo(destination: Memory, destinationOffset: Long, offset: Long = 0, min: Long = 1, max: Long = Long.MAX_VALUE): Long

Try to copy at least min but up to max bytes to the specified destination buffer from this input skipping offset bytes. If there are not enough bytes available to provide min bytes after skipping offset bytes then it will trigger the underlying source reading first and after that will simply copy available bytes even if EOF encountered so min is not a requirement but a desired number of bytes. It is safe to specify max greater than the destination free space. min shouldn't be bigger than the destination free space. This function could trigger the underlying source suspending reading. It is allowed to specify too big offset so in this case this function will always return 0 after prefetching all underlying bytes but note that it may lead to significant memory consumption. This function usually copy more bytes than min (unless max = min) but it is not guaranteed. When 0 is returned with offset = 0 then it makes sense to check isClosedForRead.

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expect abstract suspend fun readAvailable(dst: ChunkBuffer): Int

expect abstract suspend fun readAvailable(dst: ByteArray, offset: Int, length: Int): Int

Reads all available bytes to dst buffer and returns immediately or suspends if no bytes available

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expect abstract suspend fun readBoolean(): Boolean

Reads a boolean value (suspending if no bytes available yet) or fails if channel has been closed and not enough bytes.

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expect abstract suspend fun readByte(): Byte

Reads a byte (suspending if no bytes available yet) or fails if channel has been closed and not enough bytes.

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expect abstract suspend fun readDouble(): Double

Reads double number (suspending if not enough bytes available) or fails if channel has been closed and not enough bytes.

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expect abstract suspend fun readFloat(): Float

Reads float number (suspending if not enough bytes available) or fails if channel has been closed and not enough bytes.

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expect abstract suspend fun readFully(dst: ChunkBuffer, n: Int)

expect abstract suspend fun readFully(dst: ByteArray, offset: Int, length: Int)

Reads all length bytes to dst buffer or fails if channel has been closed. Suspends if not enough bytes available.

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expect abstract suspend fun readInt(): Int

Reads an int number (suspending if not enough bytes available) or fails if channel has been closed and not enough bytes.

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expect abstract suspend fun readLong(): Long

Reads a long number (suspending if not enough bytes available) or fails if channel has been closed and not enough bytes.

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expect abstract suspend fun readPacket(size: Int): ByteReadPacket

Reads the specified amount of bytes and makes a byte packet from them. Fails if channel has been closed and not enough bytes available.

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expect abstract suspend fun readRemaining(limit: Long = Long.MAX_VALUE): ByteReadPacket

Reads up to limit bytes and makes a byte packet or until end of stream encountered.

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expect abstract fun readSession(consumer: ReadSession.() -> Unit)

Starts non-suspendable read session. After channel preparation consumer lambda will be invoked immediately event if there are no bytes available for read yet.

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expect abstract suspend fun readShort(): Short

Reads a short number (suspending if not enough bytes available) or fails if channel has been closed and not enough bytes.

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expect abstract suspend fun readSuspendableSession(consumer: suspend SuspendableReadSession.() -> Unit)

Starts a suspendable read session. After channel preparation consumer lambda will be invoked immediately even if there are no bytes available for read yet. consumer lambda could suspend as much as needed.

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expect abstract suspend fun readUTF8Line(limit: Int): String?

Reads a line of UTF-8 characters up to limit characters. Supports both CR-LF and LF line endings. Throws an exception if the specified limit has been exceeded.

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expect abstract suspend fun <A : Appendable> readUTF8LineTo(out: A, limit: Int): Boolean

Reads a line of UTF-8 characters to the specified out buffer up to limit characters. Supports both CR-LF and LF line endings. No line ending characters will be appended to out buffer. Throws an exception if the specified limit has been exceeded.

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expect abstract suspend fun writeAvailable(src: ChunkBuffer): Int

expect abstract suspend fun writeAvailable(src: ByteArray, offset: Int, length: Int): Int

Writes as much as possible and only suspends if buffer is full

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expect abstract suspend fun writeByte(b: Byte)

Writes byte and suspends until written. Crashes if channel get closed while writing.

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expect abstract suspend fun writeDouble(d: Double)

Writes double number and suspends until written. Crashes if channel get closed while writing.

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expect abstract suspend fun writeFloat(f: Float)

Writes float number and suspends until written. Crashes if channel get closed while writing.

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expect abstract suspend fun writeFully(src: Buffer)
expect abstract suspend fun writeFully(memory: Memory, startIndex: Int, endIndex: Int)

expect abstract suspend fun writeFully(src: ByteArray, offset: Int, length: Int)

Writes all src bytes and suspends until all bytes written. Causes flush if buffer filled up or when autoFlush Crashes if channel get closed while writing.

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expect abstract suspend fun writeInt(i: Int)

Writes int number and suspends until written. Crashes if channel get closed while writing.

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expect abstract suspend fun writeLong(l: Long)

Writes long number and suspends until written. Crashes if channel get closed while writing.

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expect abstract suspend fun writePacket(packet: ByteReadPacket)

Writes a packet fully or fails if channel get closed before the whole packet has been written

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expect abstract suspend fun writeShort(s: Short)

Writes short number and suspends until written. Crashes if channel get closed while writing.

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expect abstract suspend fun writeSuspendSession(visitor: suspend WriterSuspendSession.() -> Unit)

Properties

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expect abstract val autoFlush: Boolean

Returns true if channel flushes automatically all pending bytes after every write function call. If false then flush only happens at manual flush invocation or when the buffer is full.

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expect abstract val availableForRead: Int

Returns number of bytes that can be read without suspension. Read operations do no suspend and return immediately when this number is at least the number of bytes requested for read.

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expect abstract val availableForWrite: Int

Returns number of bytes that can be written without suspension. Write operations do no suspend and return immediately when this number is at least the number of bytes requested for write.

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expect abstract val closedCause: Throwable?

A closure causes exception or null if closed successfully or not yet closed

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expect abstract val isClosedForRead: Boolean

Returns true if the channel is closed and no remaining bytes are available for read. It implies that availableForRead is zero.

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expect abstract val isClosedForWrite: Boolean
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expect abstract val totalBytesRead: Long

Number of bytes read from the channel. It is not guaranteed to be atomic so could be updated in the middle of long-running read operation.

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expect abstract val totalBytesWritten: Long

Number of bytes written to the channel. It is not guaranteed to be atomic so could be updated in the middle of write operation.

Inheritors

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Extensions

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Closes this channel with no failure (successfully)

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For every available bytes range invokes visitor function until it return false or end of stream encountered. The provided buffer should be never captured outside of the visitor block otherwise resource leaks, crashes and data corruptions may occur. The visitor block may be invoked multiple times, once or never.

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suspend fun ByteReadChannel.copyAndClose(dst: ByteWriteChannel, limit: Long = Long.MAX_VALUE): Long

Reads all the bytes from receiver channel and writes them to dst channel and then closes it. Closes dst channel if fails to read or write with cause exception.

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Reads bytes from receiver channel and writes them to dst channel. Closes dst channel if fails to read or write with cause exception.

expect suspend fun ByteReadChannel.copyTo(dst: ByteWriteChannel, limit: Long): Long

Reads up to limit bytes from receiver channel and writes them to dst channel. Closes dst channel if fails to read or write with cause exception.

actual suspend fun ByteReadChannel.copyTo(dst: ByteWriteChannel, limit: Long): Long

Reads up to limit bytes from receiver channel and writes them to dst channel. Closes dst channel if fails to read or write with cause exception.

suspend fun ByteReadChannel.copyTo(channel: WritableByteChannel, limit: Long = Long.MAX_VALUE): Long

Copy up to limit bytes to blocking NIO channel. Copying to a non-blocking channel requires selection and not supported. It is suspended if no data are available in a byte channel but may block if destination NIO channel blocks.

suspend fun ByteReadChannel.copyTo(pipe: Pipe, limit: Long = Long.MAX_VALUE): Long

Copy up to limit bytes to blocking pipe. A shortcut to copyTo function with NIO channel destination

suspend fun ByteReadChannel.copyTo(out: OutputStream, limit: Long = Long.MAX_VALUE): Long

Copies up to limit bytes from this byte channel to out stream suspending on read channel and blocking on output

actual suspend fun ByteReadChannel.copyTo(dst: ByteWriteChannel, limit: Long): Long

Reads up to limit bytes from receiver channel and writes them to dst channel. Closes dst channel if fails to read or write with cause exception.

actual suspend fun ByteReadChannel.copyTo(dst: ByteWriteChannel, limit: Long): Long

Reads up to limit bytes from receiver channel and writes them to dst channel. Closes dst channel if fails to read or write with cause exception.

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Discards all bytes in the channel and suspends until end of stream.

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inline suspend fun ByteReadChannel.discardExact(n: Long)

Discards exactly n bytes or fails if not enough bytes in the channel

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expect suspend fun ByteReadChannel.joinTo(dst: ByteWriteChannel, closeOnEnd: Boolean)
actual suspend fun ByteReadChannel.joinTo(dst: ByteWriteChannel, closeOnEnd: Boolean)
actual suspend fun ByteReadChannel.joinTo(dst: ByteWriteChannel, closeOnEnd: Boolean)
actual suspend fun ByteReadChannel.joinTo(dst: ByteWriteChannel, closeOnEnd: Boolean)
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inline suspend fun ByteReadChannel.read(desiredSize: Int = 1, block: (source: Memory, start: Long, endExclusive: Long) -> Int): Int

Await until at least desiredSize is available for read or EOF and invoke block function. The block function should never capture a provided Memory instance outside otherwise an undefined behaviour may occur including accidental crash or data corruption. Block function should return number of bytes consumed or 0.

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inline suspend fun ByteReadChannel.readDouble(byteOrder: ByteOrder): Double
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inline suspend fun ByteReadChannel.readFloat(byteOrder: ByteOrder): Float
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inline suspend fun ByteReadChannel.readInt(byteOrder: ByteOrder): Int
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inline suspend fun ByteReadChannel.readLong(byteOrder: ByteOrder): Long
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Reads all remaining bytes and makes a byte packet

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inline suspend fun ByteReadChannel.readShort(byteOrder: ByteOrder): Short
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Reads from the channel to the specified dst byte buffer until one of the following:

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suspend fun ByteReadChannel.skipDelimiter(delimiter: ByteBuffer)
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fun ByteReadChannel.toInputStream(parent: Job? = null): InputStream

Create blocking java.io.InputStream for this channel that does block every time the channel suspends at read Similar to do reading in runBlocking however you can pass it to regular blocking API

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fun ByteWriteChannel.toOutputStream(parent: Job? = null): OutputStream

Create blocking java.io.OutputStream for this channel that does block every time the channel suspends at write Similar to do reading in runBlocking however you can pass it to regular blocking API

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inline suspend fun ByteWriteChannel.write(desiredSpace: Int = 1, block: (freeSpace: Memory, startOffset: Long, endExclusive: Long) -> Int): Int

Await for desiredSpace will be available for write and invoke block function providing Memory instance and the corresponding range suitable for wiring in the memory. The block function should return number of bytes were written, possibly 0.

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Writes UTF16 character

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suspend fun ByteWriteChannel.writeDouble(value: Double, byteOrder: ByteOrder)
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suspend fun ByteWriteChannel.writeFloat(value: Float, byteOrder: ByteOrder)
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suspend fun ByteWriteChannel.writeInt(i: Long, byteOrder: ByteOrder)
suspend fun ByteWriteChannel.writeInt(value: Int, byteOrder: ByteOrder)
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suspend fun ByteWriteChannel.writeLong(value: Long, byteOrder: ByteOrder)
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inline suspend fun ByteWriteChannel.writePacket(builder: BytePacketBuilder.() -> Unit)
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suspend fun ByteWriteChannel.writePacketSuspend(builder: suspend BytePacketBuilder.() -> Unit)
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suspend fun ByteWriteChannel.writeShort(s: Int, byteOrder: ByteOrder)
suspend fun ByteWriteChannel.writeShort(value: Short, byteOrder: ByteOrder)
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