Roman Elizarov | 1f74a2d | 2018-06-29 19:19:45 +0300 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2016-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license. |
| 3 | */ |
| 4 | |
Sergey Mashkov | 6e61c23 | 2017-12-19 15:21:14 +0300 | [diff] [blame] | 5 | package kotlinx.coroutines.experimental.io.jvm.javaio |
| 6 | |
| 7 | import kotlinx.atomicfu.* |
| 8 | import kotlinx.coroutines.experimental.* |
| 9 | import kotlinx.coroutines.experimental.io.* |
| 10 | import java.io.* |
| 11 | import java.util.concurrent.locks.* |
| 12 | import kotlin.coroutines.experimental.* |
| 13 | import kotlin.coroutines.experimental.intrinsics.* |
| 14 | |
| 15 | /** |
| 16 | * Create blocking [java.io.InputStream] for this channel that does block every time the channel suspends at read |
| 17 | * Similar to do reading in [runBlocking] however you can pass it to regular blocking API |
| 18 | */ |
| 19 | fun ByteReadChannel.toInputStream(parent: Job? = null): InputStream = InputAdapter(parent, this) |
| 20 | |
| 21 | /** |
| 22 | * Create blocking [java.io.OutputStream] for this channel that does block every time the channel suspends at write |
| 23 | * Similar to do reading in [runBlocking] however you can pass it to regular blocking API |
| 24 | */ |
| 25 | fun ByteWriteChannel.toOutputStream(parent: Job? = null): OutputStream = OutputAdapter(parent, this) |
| 26 | |
| 27 | private class InputAdapter(parent: Job?, private val channel: ByteReadChannel) : InputStream() { |
| 28 | private val loop = object : BlockingAdapter(parent) { |
| 29 | override suspend fun loop() { |
| 30 | var rc = 0 |
| 31 | while (true) { |
| 32 | val buffer = rendezvous(rc) as ByteArray |
| 33 | rc = channel.readAvailable(buffer, offset, length) |
| 34 | if (rc == -1) break |
| 35 | } |
| 36 | } |
| 37 | } |
| 38 | |
| 39 | private var single: ByteArray? = null |
| 40 | |
| 41 | override fun available(): Int { |
| 42 | return channel.availableForRead |
| 43 | } |
| 44 | |
| 45 | @Synchronized |
| 46 | override fun read(): Int { |
| 47 | val buffer = single ?: ByteArray(1).also { single = it } |
| 48 | loop.submitAndAwait(buffer, 0, 1) |
| 49 | return buffer[0].toInt() and 0xff |
| 50 | } |
| 51 | |
| 52 | @Synchronized |
| 53 | override fun read(b: ByteArray?, off: Int, len: Int): Int { |
| 54 | return loop.submitAndAwait(b!!, off, len) |
| 55 | } |
| 56 | |
| 57 | @Synchronized |
| 58 | override fun close() { |
| 59 | super.close() |
| 60 | channel.cancel() |
| 61 | loop.shutdown() |
| 62 | } |
| 63 | } |
| 64 | |
| 65 | private val CloseToken = Any() |
| 66 | private val FlushToken = Any() |
| 67 | |
| 68 | private class OutputAdapter(parent: Job?, private val channel: ByteWriteChannel) : OutputStream() { |
| 69 | private val loop = object : BlockingAdapter(parent) { |
| 70 | override suspend fun loop() { |
| 71 | try { |
| 72 | while (true) { |
| 73 | val task = rendezvous(0) |
Sergey Mashkov | f0c1d99 | 2018-02-02 17:18:47 +0300 | [diff] [blame] | 74 | if (task === CloseToken) { |
| 75 | break |
| 76 | } |
| 77 | else if (task === FlushToken) { |
| 78 | channel.flush() |
| 79 | channel.closedCause?.let { throw it } |
| 80 | } |
Sergey Mashkov | 6e61c23 | 2017-12-19 15:21:14 +0300 | [diff] [blame] | 81 | else if (task is ByteArray) channel.writeFully(task, offset, length) |
| 82 | } |
| 83 | } catch (t: Throwable) { |
| 84 | if (t !is CancellationException) { |
| 85 | channel.close(t) |
| 86 | } |
Sergey Mashkov | f0c1d99 | 2018-02-02 17:18:47 +0300 | [diff] [blame] | 87 | throw t |
Sergey Mashkov | 6e61c23 | 2017-12-19 15:21:14 +0300 | [diff] [blame] | 88 | } finally { |
Sergey Mashkov | f0c1d99 | 2018-02-02 17:18:47 +0300 | [diff] [blame] | 89 | if (!channel.close()) { |
| 90 | channel.closedCause?.let { throw it } |
| 91 | } |
Sergey Mashkov | 6e61c23 | 2017-12-19 15:21:14 +0300 | [diff] [blame] | 92 | } |
| 93 | } |
| 94 | } |
| 95 | |
| 96 | private var single: ByteArray? = null |
| 97 | |
| 98 | @Synchronized |
| 99 | override fun write(b: Int) { |
| 100 | val buffer = single ?: ByteArray(1).also { single = it } |
| 101 | buffer[0] = b.toByte() |
| 102 | loop.submitAndAwait(buffer, 0, 1) |
| 103 | } |
| 104 | |
| 105 | @Synchronized |
| 106 | override fun write(b: ByteArray?, off: Int, len: Int) { |
| 107 | loop.submitAndAwait(b!!, off, len) |
| 108 | } |
| 109 | |
| 110 | @Synchronized |
| 111 | override fun flush() { |
| 112 | loop.submitAndAwait(FlushToken) |
| 113 | } |
| 114 | |
| 115 | @Synchronized |
| 116 | override fun close() { |
Sergey Mashkov | f0c1d99 | 2018-02-02 17:18:47 +0300 | [diff] [blame] | 117 | try { |
| 118 | loop.submitAndAwait(CloseToken) |
| 119 | loop.shutdown() |
| 120 | } catch (t: Throwable) { |
| 121 | throw IOException(t) |
| 122 | } |
Sergey Mashkov | 6e61c23 | 2017-12-19 15:21:14 +0300 | [diff] [blame] | 123 | } |
| 124 | } |
| 125 | |
| 126 | private abstract class BlockingAdapter(val parent: Job? = null) { |
| 127 | private val end: Continuation<Unit> = object : Continuation<Unit> { |
| 128 | override val context: CoroutineContext |
| 129 | get() = if (parent != null) Unconfined + parent else EmptyCoroutineContext |
| 130 | |
| 131 | override fun resume(value: Unit) { |
| 132 | var thread: Thread? = null |
| 133 | result.value = -1 |
| 134 | state.update { current -> |
| 135 | when (current) { |
| 136 | is Thread -> { |
| 137 | thread = current |
| 138 | Unit |
| 139 | } |
| 140 | this -> Unit |
| 141 | else -> return |
| 142 | } |
| 143 | } |
| 144 | |
| 145 | thread?.let { LockSupport.unpark(it) } |
| 146 | disposable?.dispose() |
| 147 | } |
| 148 | |
| 149 | override fun resumeWithException(exception: Throwable) { |
| 150 | var thread: Thread? = null |
| 151 | var continuation: Continuation<*>? = null |
| 152 | |
| 153 | result.value = -1 |
| 154 | state.update { current -> |
| 155 | when (current) { |
| 156 | is Thread -> { |
| 157 | thread = current |
| 158 | exception |
| 159 | } |
| 160 | is Continuation<*> -> { |
| 161 | continuation = current |
| 162 | exception |
| 163 | } |
| 164 | this -> exception |
| 165 | else -> return |
| 166 | } |
| 167 | } |
| 168 | |
| 169 | thread?.let { LockSupport.unpark(it) } |
| 170 | continuation?.resumeWithException(exception) |
| 171 | |
| 172 | if (exception !is CancellationException) { |
| 173 | parent?.cancel(exception) |
| 174 | } |
| 175 | |
| 176 | disposable?.dispose() |
| 177 | } |
| 178 | } |
| 179 | |
| 180 | @Suppress("LeakingThis") |
| 181 | private val state: AtomicRef<Any> = atomic(this) // could be a thread, a continuation, Unit, an exception or this if not yet started |
| 182 | private val result = atomic(0) |
| 183 | private val disposable: DisposableHandle? = parent?.invokeOnCompletion { cause -> |
| 184 | if (cause != null) { |
| 185 | end.resumeWithException(cause) |
| 186 | } |
| 187 | } |
| 188 | |
| 189 | protected var offset: Int = 0 |
| 190 | private set |
| 191 | protected var length: Int = 0 |
| 192 | private set |
| 193 | |
| 194 | init { |
| 195 | val block: suspend () -> Unit = { loop() } |
| 196 | block.startCoroutineUninterceptedOrReturn(end) |
| 197 | require(state.value !== this) |
| 198 | } |
| 199 | |
| 200 | protected abstract suspend fun loop() |
| 201 | |
| 202 | fun shutdown() { |
| 203 | disposable?.dispose() |
| 204 | end.resumeWithException(CancellationException("Stream closed")) |
| 205 | } |
| 206 | |
| 207 | fun submitAndAwait(buffer: ByteArray, offset: Int, length: Int): Int { |
| 208 | this.offset = offset |
| 209 | this.length = length |
| 210 | return submitAndAwait(buffer) |
| 211 | } |
| 212 | |
| 213 | fun submitAndAwait(jobToken: Any): Int { |
| 214 | val thread = Thread.currentThread()!! |
| 215 | |
| 216 | var cont: Continuation<Any>? = null |
| 217 | |
| 218 | state.update { value -> |
| 219 | when (value) { |
| 220 | is Continuation<*> -> { |
| 221 | @Suppress("UNCHECKED_CAST") |
| 222 | cont = value as Continuation<Any> |
| 223 | thread |
| 224 | } |
| 225 | is Unit -> { |
| 226 | return result.value |
| 227 | } |
| 228 | is Throwable -> { |
| 229 | throw value |
| 230 | } |
| 231 | is Thread -> throw IllegalStateException("There is already thread owning adapter") |
| 232 | this -> throw IllegalStateException("Not yet started") |
| 233 | else -> NoWhenBranchMatchedException() |
| 234 | } |
| 235 | } |
| 236 | |
| 237 | cont!!.resume(jobToken) |
| 238 | |
| 239 | while (state.value === thread) { |
| 240 | LockSupport.park() |
| 241 | } |
| 242 | |
Sergey Mashkov | f0c1d99 | 2018-02-02 17:18:47 +0300 | [diff] [blame] | 243 | state.value.let { state -> |
| 244 | if (state is Throwable) { |
| 245 | throw state |
| 246 | } |
| 247 | } |
| 248 | |
Sergey Mashkov | 6e61c23 | 2017-12-19 15:21:14 +0300 | [diff] [blame] | 249 | return result.value |
| 250 | } |
| 251 | |
| 252 | @Suppress("NOTHING_TO_INLINE") |
| 253 | protected suspend inline fun rendezvous(rc: Int): Any { |
| 254 | result.value = rc |
| 255 | |
| 256 | return suspendCoroutineOrReturn { c -> |
| 257 | var thread: Thread? = null |
| 258 | |
| 259 | state.update { value -> |
| 260 | when (value) { |
| 261 | is Thread -> { |
| 262 | thread = value |
| 263 | c |
| 264 | } |
| 265 | this -> c |
| 266 | else -> throw IllegalStateException("Already suspended or in finished state") |
| 267 | } |
| 268 | } |
| 269 | |
| 270 | if (thread != null) { |
| 271 | LockSupport.unpark(thread) |
| 272 | } |
| 273 | |
| 274 | COROUTINE_SUSPENDED |
| 275 | } |
| 276 | } |
| 277 | } |