From 7fe17b6b441e145e7e4c46f0aed83b86a00d4e57 Mon Sep 17 00:00:00 2001
From: Samuel Tardieu <sam@rfc1149.net>
Date: Sun, 12 Jan 2014 16:15:29 +0100
Subject: When storing a cache, download images concurrently

Up to 5 downloads can happen simultaneously. Also, those downloads are
executed concurrently to static map requests if any.
---
 main/src/cgeo/geocaching/utils/CancellableHandler.java | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

(limited to 'main/src/cgeo/geocaching/utils/CancellableHandler.java')

diff --git a/main/src/cgeo/geocaching/utils/CancellableHandler.java b/main/src/cgeo/geocaching/utils/CancellableHandler.java
index cb4b9db..01fb568 100644
--- a/main/src/cgeo/geocaching/utils/CancellableHandler.java
+++ b/main/src/cgeo/geocaching/utils/CancellableHandler.java
@@ -2,6 +2,9 @@ package cgeo.geocaching.utils;
 
 import cgeo.geocaching.CgeoApplication;
 
+import rx.Subscription;
+import rx.subscriptions.CompositeSubscription;
+
 import android.os.Handler;
 import android.os.Message;
 
@@ -13,6 +16,7 @@ public abstract class CancellableHandler extends Handler {
 
     protected static final int UPDATE_LOAD_PROGRESS_DETAIL = 42186;
     private volatile boolean cancelled = false;
+    private static CompositeSubscription subscriptions = new CompositeSubscription();
 
     private static class CancelHolder {
         final Object payload;
@@ -30,6 +34,7 @@ public abstract class CancellableHandler extends Handler {
 
         if (message.obj instanceof CancelHolder) {
             cancelled = true;
+            subscriptions.unsubscribe();
             handleCancel(((CancelHolder) message.obj).payload);
         } else {
             handleRegularMessage(message);
@@ -37,6 +42,17 @@ public abstract class CancellableHandler extends Handler {
     }
 
     /**
+     * Add a subscription to the list of subscriptions to be subscribed at cancellation time.
+     */
+    final public void unsubscribeIfCancelled(final Subscription subscription) {
+        subscriptions.add(subscription);
+        if (cancelled) {
+            // Protect against race conditions
+            subscriptions.unsubscribe();
+        }
+    }
+
+    /**
      * Handle a non-cancel message.<br>
      * Subclasses must implement this to handle messages.
      *
-- 
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