From 54d7b2ce520e57cc0ffb9582546b80a32fa00682 Mon Sep 17 00:00:00 2001
From: Trygve Laugstøl <trygvis@inamo.no>
Date: Wed, 12 Jun 2013 22:55:18 +0200
Subject: wip

---
 src/main/java/io/trygvis/async/QueueThread.java | 79 +++++++++++++++++++++----
 1 file changed, 66 insertions(+), 13 deletions(-)

(limited to 'src/main/java/io/trygvis/async/QueueThread.java')

diff --git a/src/main/java/io/trygvis/async/QueueThread.java b/src/main/java/io/trygvis/async/QueueThread.java
index ea77911..61196b6 100644
--- a/src/main/java/io/trygvis/async/QueueThread.java
+++ b/src/main/java/io/trygvis/async/QueueThread.java
@@ -11,6 +11,7 @@ import org.slf4j.LoggerFactory;
 import java.sql.Connection;
 import java.sql.SQLException;
 import java.util.List;
+import java.util.concurrent.ScheduledThreadPoolExecutor;
 
 import static io.trygvis.queue.QueueService.TaskExecutionRequest;
 import static io.trygvis.queue.Task.TaskState.NEW;
@@ -28,11 +29,15 @@ class QueueThread implements Runnable {
 
     public final Queue queue;
 
-    public boolean shouldRun = true;
+    private boolean shouldRun = true;
 
     private boolean checkForNewTasks;
 
-    private boolean busy;
+    private boolean available;
+
+    private boolean running;
+
+    private Thread thread;
 
     QueueThread(QueueSystem queueSystem, TaskEffect taskEffect, Queue queue) {
         this.queueSystem = queueSystem;
@@ -44,9 +49,10 @@ class QueueThread implements Runnable {
 
     public void ping() {
         synchronized (this) {
-            if (!busy) {
+            System.out.println("QueueThread.ping: available=" + available + ", checkForNewTasks=" + checkForNewTasks);
+            if (available) {
                 log.info("Sending ping to " + queue);
-                notify();
+                notifyAll();
             } else {
                 checkForNewTasks = true;
             }
@@ -70,27 +76,74 @@ class QueueThread implements Runnable {
                 if (tasks.size() > 0) {
                     queueService.executeTask(req, taskEffect, tasks);
                 }
+
+                // If we found exactly the same number of tasks that we asked for, there is most likely more to go.
+                if (tasks.size() == req.chunkSize) {
+                    continue;
+                }
             } catch (Throwable e) {
-                log.warn("Error while executing tasks.", e);
+                if (shouldRun) {
+                    log.warn("Error while executing tasks.", e);
+                }
             }
 
             synchronized (this) {
-                busy = false;
+                available = true;
 
                 if (checkForNewTasks) {
                     log.info("Ping received!");
                     checkForNewTasks = false;
-                    continue;
+                } else {
+                    try {
+                        wait(queue.interval);
+                    } catch (InterruptedException e) {
+                        // ignore
+                    }
                 }
 
-                try {
-                    wait();
-                } catch (InterruptedException e) {
-                    // ignore
-                }
+                available = false;
+            }
+        }
+
+        log.info("Thread for queue {} has stopped.", queue.name);
+        running = false;
+        synchronized (this) {
+            this.notifyAll();
+        }
+    }
+
+    public synchronized void start(ScheduledThreadPoolExecutor executor) {
+        if (running) {
+            throw new IllegalStateException("Already running");
+        }
 
-                busy = true;
+        log.info("Starting thread for queue {} with poll interval = {}s", queue.name, queue.interval);
+
+        running = true;
+
+        thread = new Thread(this, queue.name);
+        thread.setDaemon(true);
+        thread.start();
+    }
+
+    public synchronized void stop() {
+        if (!running) {
+            return;
+        }
+
+        log.info("Stopping thread for queue {}", queue.name);
+
+        shouldRun = false;
+
+        thread.interrupt();
+        while (running) {
+            try {
+                wait(1000);
+            } catch (InterruptedException e) {
+                // continue
             }
+            thread.interrupt();
         }
+        thread = null;
     }
 }
-- 
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