122 lines
2.8 KiB
Kotlin
122 lines
2.8 KiB
Kotlin
package org.operndr.extras.filewatcher
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import com.sun.nio.file.SensitivityWatchEventModifier
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import org.openrndr.Program
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import org.openrndr.launch
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import java.io.File
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import java.nio.file.FileSystems
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import java.nio.file.Path
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import java.nio.file.StandardWatchEventKinds
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import java.nio.file.WatchKey
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import kotlin.concurrent.thread
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class FileWatcher(private val program: Program, val file: File, private val onChange: (File) -> Unit) {
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val path = file.absoluteFile.toPath()
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val parent = path.parent
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val key = pathKeys.getOrPut(parent) {
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parent.register(
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watchService, arrayOf(StandardWatchEventKinds.ENTRY_MODIFY),
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SensitivityWatchEventModifier.HIGH
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)
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}
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init {
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watchThread
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watching.getOrPut(path) {
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mutableListOf()
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}.add(this)
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keyPaths.getOrPut(key) { parent }
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}
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fun stop() {
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watching[path]?.remove(this)
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}
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internal fun triggerChange() {
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program.launch {
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onChange(file)
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}
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}
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}
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private val watchers = mutableMapOf< ()->Any, FileWatcher>()
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fun <T> watchFile(program: Program, file: File, transducer: (File) -> T): () -> T {
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var result = transducer(file)
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val watcher = FileWatcher(program, file) {
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try {
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result = transducer(file)
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} catch (e: Throwable) {
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e.printStackTrace()
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}
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}
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val function = {
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result
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}
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@Suppress("UNCHECKED_CAST")
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watchers[function as ()->Any] = watcher
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return function
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}
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/**
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* Stops the watcher
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*/
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fun <T> (()->T).stop() {
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@Suppress("UNCHECKED_CAST")
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watchers[this as ()->Any]?.stop()
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}
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/**
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* Triggers reload
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*/
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fun <T> (()->T).triggerChange() {
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@Suppress("UNCHECKED_CAST")
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watchers[this as ()->Any]?.triggerChange()
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}
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@JvmName("programWatchFile")
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fun <T> Program.watchFile(file: File, transducer: (File) -> T): () -> T = watchFile(this, file, transducer)
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private val watching = mutableMapOf<Path, MutableList<FileWatcher>>()
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private val pathKeys = mutableMapOf<Path, WatchKey>()
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private val keyPaths = mutableMapOf<WatchKey, Path>()
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private val watchService by lazy {
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FileSystems.getDefault().newWatchService()
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}
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private val watchThread by lazy {
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thread(isDaemon = true) {
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while (true) {
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val key = watchService.take()
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val path = keyPaths[key]
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key.pollEvents().forEach {
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val contextPath = it.context() as Path
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val fullPath = path?.resolve(contextPath)
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watching[fullPath]?.forEach { w ->
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w.triggerChange()
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}
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}
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key.reset()
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}
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}
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}
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fun main() {
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val a = watchFile(Program(), File("README.md")) {
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it.readText()
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}
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a.stop()
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a.triggerChange()
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while (true) {
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println(a())
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Thread.sleep(2000)
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}
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}
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