Replace Queue Worker with ThreadPoolExecutor based TasksQueue

app/src/main/java/com/bartlomiejpluta/ttsserver/core/lua/loader/EndpointLoader.kt

@@ -8,6 +8,7 @@ import com.bartlomiejpluta.ttsserver.core.lua.sandbox.SandboxFactory
 import com.bartlomiejpluta.ttsserver.core.web.endpoint.DefaultEndpoint
 import com.bartlomiejpluta.ttsserver.core.web.endpoint.Endpoint
 import com.bartlomiejpluta.ttsserver.core.web.endpoint.QueuedEndpoint
+import com.bartlomiejpluta.ttsserver.core.web.queue.TasksQueueFactory
 import com.bartlomiejpluta.ttsserver.core.web.uri.UriTemplate
 import com.bartlomiejpluta.ttsserver.ui.main.MainActivity
 import fi.iki.elonen.NanoHTTPD.Method
@@ -17,7 +18,8 @@ import java.io.File
 
 class EndpointLoader(
    private val context: Context,
-   private val sandboxFactory: SandboxFactory
+   private val sandboxFactory: SandboxFactory,
+   private val tasksQueueFactory: TasksQueueFactory
 ) {
 
    fun loadEndpoints(): List<Endpoint> {
@@ -57,18 +59,19 @@ class EndpointLoader(
    }
 
    private fun createDefaultEndpoint(luaTable: LuaTable): Endpoint = DefaultEndpoint(
+      consumer = parseConsumer(luaTable),
       uri = parseUri(luaTable),
       method = parseMethod(luaTable),
-      accepts = parseAccepts(luaTable),
-      consumer = parseConsumer(luaTable)
+      accepts = parseAccepts(luaTable)
    )
 
    private fun createQueuedEndpoint(luaTable: LuaTable): Endpoint = QueuedEndpoint(
       context = context,
+      queue = tasksQueueFactory.create(),
+      consumer = parseConsumer(luaTable),
       uri = parseUri(luaTable),
       method = parseMethod(luaTable),
-      accepts = parseAccepts(luaTable),
-      consumer = parseConsumer(luaTable)
+      accepts = parseAccepts(luaTable)
    )
 
    private fun parseUri(luaTable: LuaTable) = luaTable.get("path").checkjstring()

app/src/main/java/com/bartlomiejpluta/ttsserver/core/web/endpoint/DefaultEndpoint.kt

@@ -10,10 +10,10 @@ import java.io.File
 import java.io.FileInputStream
 
 class DefaultEndpoint(
+   private val consumer: LuaClosure,
    uri: UriTemplate,
-   accepts: String?,
    method: Method,
-   private val consumer: LuaClosure
+   accepts: String?
 ) : AbstractEndpoint(uri, accepts, method) {
 
    override fun safeHit(request: Request) = request.luaTable

app/src/main/java/com/bartlomiejpluta/ttsserver/core/web/endpoint/QueuedEndpoint.kt

@@ -2,31 +2,29 @@ package com.bartlomiejpluta.ttsserver.core.web.endpoint
 
 import android.content.Context
 import com.bartlomiejpluta.ttsserver.core.web.dto.Request
+import com.bartlomiejpluta.ttsserver.core.web.queue.TasksQueue
+import com.bartlomiejpluta.ttsserver.core.web.task.QueueableTask
 import com.bartlomiejpluta.ttsserver.core.web.uri.UriTemplate
-import com.bartlomiejpluta.ttsserver.core.web.worker.Worker
 import fi.iki.elonen.NanoHTTPD
 import fi.iki.elonen.NanoHTTPD.newFixedLengthResponse
 import org.luaj.vm2.LuaClosure
-import java.util.concurrent.LinkedBlockingQueue
 
 class QueuedEndpoint(
-   context: Context,
+   private val context: Context,
+   private val queue: TasksQueue,
+   private val consumer: LuaClosure,
    uri: UriTemplate,
-   accepts: String?,
    method: NanoHTTPD.Method,
-   consumer: LuaClosure
+   accepts: String?
 ) : AbstractEndpoint(uri, accepts, method) {
-   private val queue = LinkedBlockingQueue<Request>()
-   private val worker = Thread(Worker(context, queue, consumer)).also { it.name = uri.template }
-
 
    override fun safeHit(request: Request): NanoHTTPD.Response? {
-      queue.add(request)
+      val task = QueueableTask(context, consumer, request, queue)
+      queue.push(task)
       return newFixedLengthResponse(NanoHTTPD.Response.Status.ACCEPTED, "text/plain", "")
    }
 
-   fun runWorker() = worker.start()
-   fun stopWorker() = worker.interrupt()
+   fun shutdownQueue() = queue.shutdown()
 
    override fun toString() = "Q[${uri.template}]"
 }

app/src/main/java/com/bartlomiejpluta/ttsserver/core/web/queue/TasksQueue.kt

@@ -0,0 +1,9 @@
+package com.bartlomiejpluta.ttsserver.core.web.queue
+
+import com.bartlomiejpluta.ttsserver.core.web.task.QueueableTask
+
+interface TasksQueue {
+   fun push(queueableTask: QueueableTask)
+   fun shutdown()
+   val size: Int
+}

app/src/main/java/com/bartlomiejpluta/ttsserver/core/web/queue/TasksQueueFactory.kt

@@ -0,0 +1,5 @@
+package com.bartlomiejpluta.ttsserver.core.web.queue
+
+class TasksQueueFactory {
+   fun create() = ThreadPoolBasedTasksQueue()
+}

app/src/main/java/com/bartlomiejpluta/ttsserver/core/web/queue/ThreadPoolBasedTasksQueue.kt

@@ -0,0 +1,22 @@
+package com.bartlomiejpluta.ttsserver.core.web.queue
+
+import com.bartlomiejpluta.ttsserver.core.web.task.QueueableTask
+import java.util.concurrent.LinkedBlockingQueue
+import java.util.concurrent.ThreadPoolExecutor
+import java.util.concurrent.TimeUnit
+
+class ThreadPoolBasedTasksQueue : TasksQueue {
+   private val executor = ThreadPoolExecutor(1, 1, 0L, TimeUnit.MILLISECONDS, LinkedBlockingQueue())
+
+   override fun push(queueableTask: QueueableTask) {
+      executor.execute(queueableTask)
+   }
+
+   override fun shutdown() {
+      executor.shutdown()
+      executor.awaitTermination(5L, TimeUnit.SECONDS)
+   }
+
+   override val size: Int
+      get() = executor.queue.size
+}

app/src/main/java/com/bartlomiejpluta/ttsserver/core/web/server/WebServer.kt

@@ -75,7 +75,6 @@ class WebServer(
 
    override fun start() {
       super.start()
-      queuedEndpoints.forEach { it.runWorker() }
 
       LocalBroadcastManager
          .getInstance(context)
@@ -86,7 +85,7 @@ class WebServer(
 
    override fun stop() {
       super.stop()
-      queuedEndpoints.forEach { it.stopWorker() }
+      queuedEndpoints.forEach { it.shutdownQueue() }
 
       LocalBroadcastManager
          .getInstance(context)

app/src/main/java/com/bartlomiejpluta/ttsserver/core/web/task/QueueableTask.kt

@@ -1,38 +1,33 @@
-package com.bartlomiejpluta.ttsserver.core.web.worker
+package com.bartlomiejpluta.ttsserver.core.web.task
 
 import android.content.Context
 import android.content.Intent
 import androidx.localbroadcastmanager.content.LocalBroadcastManager
 import com.bartlomiejpluta.R
 import com.bartlomiejpluta.ttsserver.core.web.dto.Request
-import com.bartlomiejpluta.ttsserver.service.foreground.ForegroundService
-import com.bartlomiejpluta.ttsserver.service.state.ServiceState
+import com.bartlomiejpluta.ttsserver.core.web.queue.TasksQueue
 import com.bartlomiejpluta.ttsserver.ui.main.MainActivity
 import org.luaj.vm2.LuaClosure
 import org.luaj.vm2.LuaError
 import org.luaj.vm2.LuaInteger
 import org.luaj.vm2.LuaValue
 import org.luaj.vm2.lib.ZeroArgFunction
-import java.util.concurrent.BlockingQueue
 
-class Worker(
+class QueueableTask(
    private val context: Context,
-   private val queue: BlockingQueue<Request>,
-   private val consumer: LuaClosure
+   private val consumer: LuaClosure,
+   private val request: Request,
+   private val queue: TasksQueue
 ) : Runnable {
-   override fun run() = try {
-      while (ForegroundService.state == ServiceState.RUNNING) {
-         consume(queue.take())
+
+   override fun run() {
+      try {
+         consumer.call(request.luaTable, QueueSizeFunction(queue))
+      } catch (e: LuaError) {
+         handleLuaError(e)
       }
-   } catch (e: InterruptedException) {
-      Thread.currentThread().interrupt()
    }
 
-   private fun consume(request: Request) = try {
-      consumer.call(request.luaTable, QueueSizeFunction(queue))
-   } catch (e: LuaError) {
-      handleLuaError(e)
-   }
 
    private fun handleLuaError(exception: LuaError) {
       LocalBroadcastManager
@@ -43,7 +38,7 @@ class Worker(
          })
    }
 
-   class QueueSizeFunction(private val queue: BlockingQueue<Request>) : ZeroArgFunction() {
+   class QueueSizeFunction(private val queue: TasksQueue) : ZeroArgFunction() {
       override fun call(): LuaInteger = LuaValue.valueOf(queue.size)
    }
 }

app/src/main/java/com/bartlomiejpluta/ttsserver/di/module/LuaModule.kt

@@ -8,6 +8,7 @@ import com.bartlomiejpluta.ttsserver.core.lua.loader.EndpointLoader
 import com.bartlomiejpluta.ttsserver.core.lua.sandbox.SandboxFactory
 import com.bartlomiejpluta.ttsserver.core.tts.engine.TTSEngine
 import com.bartlomiejpluta.ttsserver.core.util.NetworkUtil
+import com.bartlomiejpluta.ttsserver.core.web.queue.TasksQueueFactory
 import com.bartlomiejpluta.ttsserver.initializer.ScriptsInitializer
 import dagger.Module
 import dagger.Provides
@@ -18,8 +19,12 @@ class LuaModule {
 
    @Provides
    @Singleton
-   fun endpointLoader(context: Context, sandboxFactory: SandboxFactory) =
-      EndpointLoader(context, sandboxFactory)
+   fun endpointLoader(
+      context: Context,
+      sandboxFactory: SandboxFactory,
+      tasksQueueFactory: TasksQueueFactory
+   ) =
+      EndpointLoader(context, sandboxFactory, tasksQueueFactory)
 
    @Provides
    @Singleton
@@ -45,6 +50,10 @@ class LuaModule {
       sonosLibrary
    )
 
+   @Provides
+   @Singleton
+   fun tasksQueueFactory() = TasksQueueFactory()
+
    @Provides
    @Singleton
    fun threadLibrary() = ThreadLibrary()

app/src/main/java/com/bartlomiejpluta/ttsserver/di/module/TTSModule.kt

@@ -62,7 +62,7 @@ class TTSModule {
 
    @Provides
    @Singleton
-   fun adudioConverter(context: Context) = AudioConverter(context)
+   fun audioConverter(context: Context) = AudioConverter(context)
 
    @Provides
    @Singleton