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-rw-r--r--core/src/main/kotlin/ca/allanwang/kau/kotlin/Debouncer.kt124
-rw-r--r--core/src/main/kotlin/ca/allanwang/kau/kotlin/LazyResettable.kt2
-rw-r--r--core/src/main/kotlin/ca/allanwang/kau/logging/TimberLogger.kt3
3 files changed, 128 insertions, 1 deletions
diff --git a/core/src/main/kotlin/ca/allanwang/kau/kotlin/Debouncer.kt b/core/src/main/kotlin/ca/allanwang/kau/kotlin/Debouncer.kt
new file mode 100644
index 0000000..4fba2c8
--- /dev/null
+++ b/core/src/main/kotlin/ca/allanwang/kau/kotlin/Debouncer.kt
@@ -0,0 +1,124 @@
+package ca.allanwang.kau.kotlin
+
+import ca.allanwang.kau.logging.KL
+import java.util.concurrent.Executors
+import java.util.concurrent.TimeUnit
+
+/**
+ * Created by Allan Wang on 2017-08-05.
+ *
+ * Thread safe function wrapper to allow for debouncing
+ * With reference to <a href="https://stackoverflow.com/a/20978973/4407321">Stack Overflow</a>
+ */
+
+/**
+ * The debouncer base
+ * Implements everything except for the callback,
+ * as the number of variables is different between implementations
+ * You may still use this without extending it, but you'll have to pass a callback each time
+ */
+open class Debouncer(var interval: Long) {
+ private val sched = Executors.newScheduledThreadPool(1)
+ private var task: DebounceTask? = null
+
+ /**
+ * Generic invocation to pass a callback to the new task
+ * Pass a new callback for the task
+ * If another task is pending, it will be invalidated
+ */
+ operator fun invoke(callback: () -> Unit) {
+ synchronized(this) {
+ task?.invalidate()
+ val newTask = DebounceTask(callback)
+ KL.v("Debouncer task created: $newTask in $this")
+ sched.schedule(newTask, interval, TimeUnit.MILLISECONDS)
+ task = newTask
+ }
+ }
+
+ /**
+ * Call to cancel all pending requests and shutdown the thread pool
+ * The debouncer cannot be used after this
+ */
+ fun terminate() = sched.shutdownNow()
+
+ /**
+ * Invalidate any pending tasks
+ */
+ fun cancel() {
+ synchronized(this) {
+ if (task != null) KL.v("Debouncer cancelled for $task in $this")
+ task?.invalidate()
+ task = null
+ }
+ }
+
+}
+
+/*
+ * Helper extensions for functions with 0 to 3 arguments
+ */
+
+/**
+ * The debounced task
+ * Holds a callback to execute if the time has come and it is still valid
+ * All methods can be viewed as synchronous as the invocation is synchronous
+ */
+private class DebounceTask(inline val callback: () -> Unit) : Runnable {
+ private var valid = true
+
+ fun invalidate() {
+ valid = false
+ }
+
+ override fun run() {
+ if (!valid) return
+ valid = false
+ KL.v("Debouncer task executed $this")
+ try {
+ callback()
+ } catch (e: Exception) {
+ KL.e(e, "DebouncerTask exception")
+ }
+ }
+}
+
+/**
+ * A zero input debouncer
+ */
+class Debouncer0 internal constructor(interval: Long, val callback: () -> Unit) : Debouncer(interval) {
+ operator fun invoke() = invoke(callback)
+}
+
+fun debounce(interval: Long, callback: () -> Unit) = Debouncer0(interval, callback)
+fun (() -> Unit).debounce(interval: Long) = debounce(interval, this)
+
+/**
+ * A one argument input debouncer
+ */
+class Debouncer1<T> internal constructor(interval: Long, val callback: (T) -> Unit) : Debouncer(interval) {
+ operator fun invoke(key: T) = invoke { callback(key) }
+}
+
+fun <T> debounce(interval: Long, callback: (T) -> Unit) = Debouncer1(interval, callback)
+fun <T> ((T) -> Unit).debounce(interval: Long) = debounce(interval, this)
+
+/**
+ * A two argument input debouncer
+ */
+class Debouncer2<T, V> internal constructor(interval: Long, val callback: (T, V) -> Unit) : Debouncer(interval) {
+ operator fun invoke(arg0: T, arg1: V) = invoke { callback(arg0, arg1) }
+}
+
+fun <T, V> debounce(interval: Long, callback: (T, V) -> Unit) = Debouncer2(interval, callback)
+fun <T, V> ((T, V) -> Unit).debounce(interval: Long) = debounce(interval, this)
+
+/**
+ * A three argument input debouncer
+ */
+class Debouncer3<T, U, V> internal constructor(interval: Long, val callback: (T, U, V) -> Unit) : Debouncer(interval) {
+ operator fun invoke(arg0: T, arg1: U, arg2: V) = invoke { callback(arg0, arg1, arg2) }
+}
+
+fun <T, U, V> debounce(interval: Long, callback: ((T, U, V) -> Unit)) = Debouncer3(interval, callback)
+fun <T, U, V> ((T, U, V) -> Unit).debounce(interval: Long) = debounce(interval, this)
diff --git a/core/src/main/kotlin/ca/allanwang/kau/kotlin/LazyResettable.kt b/core/src/main/kotlin/ca/allanwang/kau/kotlin/LazyResettable.kt
index 2ac5d2f..ceeaa30 100644
--- a/core/src/main/kotlin/ca/allanwang/kau/kotlin/LazyResettable.kt
+++ b/core/src/main/kotlin/ca/allanwang/kau/kotlin/LazyResettable.kt
@@ -13,7 +13,7 @@ internal object UNINITIALIZED
fun <T : Any> lazyResettable(initializer: () -> T): LazyResettable<T> = LazyResettable<T>(initializer)
-open class LazyResettable<T : Any>(private val initializer: () -> T, lock: Any? = null) : ILazyResettable<T>, Serializable {
+class LazyResettable<T : Any>(private val initializer: () -> T, lock: Any? = null) : ILazyResettable<T>, Serializable {
@Volatile private var _value: Any = UNINITIALIZED
private val lock = lock ?: this
diff --git a/core/src/main/kotlin/ca/allanwang/kau/logging/TimberLogger.kt b/core/src/main/kotlin/ca/allanwang/kau/logging/TimberLogger.kt
index 4c6d655..4cf566a 100644
--- a/core/src/main/kotlin/ca/allanwang/kau/logging/TimberLogger.kt
+++ b/core/src/main/kotlin/ca/allanwang/kau/logging/TimberLogger.kt
@@ -18,4 +18,7 @@ open class TimberLogger(tag: String) {
inline fun i(s: String) = Timber.i(TAG, s)
inline fun v(s: String) = Timber.v(TAG, s)
inline fun eThrow(s: String) = e(Throwable(s))
+// fun plant() {
+// Timber.plant(Timber.Tree())
+// }
} \ No newline at end of file