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