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/*
* Copyright 2017-2023 JetBrains s.r.o. and respective authors and developers.
* Use of this source code is governed by the Apache 2.0 license that can be found in the LICENCE file.
*/
/*
* Copyright (C) 2019 Square, Inc.
*
* Licensed 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
*
* http://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.
*/
package kotlinx.io
/**
* A sink that facilitates typed data writes and keeps a buffer internally so that caller can write some data without
* sending it directly to an upstream.
*
* [Sink] is the main `kotlinx-io` interface to write data in client's code,
* any [RawSink] could be turned into [Sink] using [RawSink.buffered].
*
* Depending on the kind of upstream and the number of bytes written, buffering may improve the performance
* by hiding the latency of small writes.
*
* Data stored inside the internal buffer could be sent to an upstream using [flush], [emit], or [hintEmit]:
* - [flush] writes the whole buffer to an upstream and then flushes the upstream.
* - [emit] writes all data from the buffer into the upstream without flushing it.
* - [hintEmit] hints the source that current write operation is now finished and a part of data from the buffer
* may be partially emitted into the upstream.
* The latter is aimed to reduce memory footprint by keeping the buffer as small as possible without excessive writes
* to the upstream.
* All write operations implicitly calls [hintEmit].
*
* ### Write methods' behavior and naming conventions
*
* Methods writing a value of some type are usually named `write`, like [writeByte] or [writeInt], except methods
* writing data from a some collection of bytes, like `write(ByteArray, Int, Int)` or
* `write(source: RawSource, byteCount: Long)`.
* In the latter case, if a collection is consumable (i.e., once data was read from it will no longer be available for
* reading again), write method will consume as many bytes as it was requested to write.
*
* Methods fully consuming its argument are named `transferFrom`, like [transferFrom].
*
* It is recommended to follow the same naming convention for Sink extensions.
*/
public sealed interface Sink : RawSink {
/**
* This sink's internal buffer. It contains data written to the sink, but not yet flushed to the upstream.
*
* Incorrect use of the buffer may cause data loss or unexpected data being sent to the upstream.
* Consider using alternative APIs to write data into the sink, if possible:
* - write data into separate [Buffer] instance and write that buffer into the sink and then flush the sink to
* ensure that the upstream will receive complete data;
* - implement [RawSink] and wrap an upstream sink into it to intercept data being written.
*
* If there is an actual need to write data directly into the buffer, consider using [Sink.writeToInternalBuffer] instead.
*/
@InternalIoApi
public val buffer: Buffer
/**
* Writes bytes from [source] array or its subrange to this sink.
*
* @param source the array from which bytes will be written into this sink.
* @param startIndex the start index (inclusive) of the [source] subrange to be written, 0 by default.
* @param endIndex the endIndex (exclusive) of the [source] subrange to be written, size of the [source] by default.
*
* @throws IndexOutOfBoundsException when [startIndex] or [endIndex] is out of range of [source] array indices.
* @throws IllegalArgumentException when `startIndex > endIndex`.
* @throws IllegalStateException when the sink is closed.
*
* @sample kotlinx.io.samples.KotlinxIoCoreCommonSamples.writeByteArrayToSink
*/
public fun write(source: ByteArray, startIndex: Int = 0, endIndex: Int = source.size)
/**
* Removes all bytes from [source] and write them to this sink.
* Returns the number of bytes read which will be 0 if [source] is exhausted.
*
* @param source the source to consume data from.
*
* @throws IllegalStateException when the sink or [source] is closed.
*
* @sample kotlinx.io.samples.KotlinxIoCoreCommonSamples.transferFrom
*/
public fun transferFrom(source: RawSource): Long
/**
* Removes [byteCount] bytes from [source] and write them to this sink.
*
* If [source] will be exhausted before reading [byteCount] from it then an exception throws on
* an attempt to read remaining bytes will be propagated to a caller of this method.
*
* @param source the source to consume data from.
* @param byteCount the number of bytes to read from [source] and to write into this sink.
*
* @throws IllegalArgumentException when [byteCount] is negative.
* @throws IllegalStateException when the sink or [source] is closed.
*
* @sample kotlinx.io.samples.KotlinxIoCoreCommonSamples.writeSourceToSink
*/
public fun write(source: RawSource, byteCount: Long)
/**
* Writes a byte to this sink.
*
* @param byte the byte to be written.
*
* @throws IllegalStateException when the sink is closed.
*
* @sample kotlinx.io.samples.KotlinxIoCoreCommonSamples.writeByte
*/
public fun writeByte(byte: Byte)
/**
* Writes two bytes containing [short], in the big-endian order, to this sink.
*
* @param short the short integer to be written.
*
* @throws IllegalStateException when the sink is closed.
*
* @sample kotlinx.io.samples.KotlinxIoCoreCommonSamples.writeShort
*/
public fun writeShort(short: Short)
/**
* Writes four bytes containing [int], in the big-endian order, to this sink.
*
* @param int the integer to be written.
*
* @throws IllegalStateException when the sink is closed.
*
* @sample kotlinx.io.samples.KotlinxIoCoreCommonSamples.writeInt
*/
public fun writeInt(int: Int)
/**
* Writes eight bytes containing [long], in the big-endian order, to this sink.
*
* @param long the long integer to be written.
*
* @throws IllegalStateException when the sink is closed.
*
* @sample kotlinx.io.samples.KotlinxIoCoreCommonSamples.writeLong
*/
public fun writeLong(long: Long)
/**
* Writes all buffered data to the underlying sink, if one exists.
* Then the underlying sink is explicitly flushed.
*
* @throws IllegalStateException when the sink is closed.
*
* @sample kotlinx.io.samples.KotlinxIoCoreCommonSamples.flush
*/
override fun flush()
/**
* Writes all buffered data to the underlying sink if one exists.
* The underlying sink will not be explicitly flushed.
*
* This method behaves like [flush], but has weaker guarantees.
* Call this method before a buffered sink goes out of scope so that its data can reach its destination.
*
* @throws IllegalStateException when the sink is closed.
*
* @sample kotlinx.io.samples.KotlinxIoCoreCommonSamples.emit
*/
public fun emit()
/**
* Hints that the buffer may be *partially* emitted (see [emit]) to the underlying sink.
* The underlying sink will not be explicitly flushed.
* There are no guarantees that this call will cause emit of buffered data as well as
* there are no guarantees how many bytes will be emitted.
*
* Typically, application code will not need to call this: it is only necessary when
* application code writes directly to this [buffered].
* Use this to limit the memory held in the buffer.
*
* Consider using [Sink.writeToInternalBuffer] for writes into [buffered] followed by [hintEmit] call.
*
* @throws IllegalStateException when the sink is closed.
*/
@InternalIoApi
public fun hintEmit()
}
