add error cache listener

Author: sheckspir

Diff for: library/src/main/java/com/danikula/videocache/ErrorCacheListener.java

@@ -0,0 +1,13 @@
+package com.danikula.videocache;
+
+import java.io.File;
+
+/**
+ * Listener for cache error.
+ *
+ * @author Sasha Karamyshev (sheckspir88@gmail.com)
+ */
+public interface ErrorCacheListener {
+
+    void onCacheUnavailable(Throwable throwable);
+}

Diff for: library/src/main/java/com/danikula/videocache/HttpProxyCache.java

@@ -23,7 +23,8 @@ class HttpProxyCache extends ProxyCache {
 
     private final HttpUrlSource source;
     private final FileCache cache;
-    private CacheListener listener;
+    private CacheListener cacheListener;
+    private ErrorCacheListener errorListener;
 
     public HttpProxyCache(HttpUrlSource source, FileCache cache) {
         super(source, cache);
@@ -32,7 +33,11 @@ public HttpProxyCache(HttpUrlSource source, FileCache cache) {
     }
 
     public void registerCacheListener(CacheListener cacheListener) {
-        this.listener = cacheListener;
+        this.cacheListener = cacheListener;
+    }
+
+    public void registerErrorListener(ErrorCacheListener errorCacheListener) {
+        this.errorListener = errorCacheListener;
     }
 
     public void processRequest(GetRequest request, Socket socket) throws IOException, ProxyCacheException {
@@ -105,8 +110,16 @@ private String format(String pattern, Object... args) {
 
     @Override
     protected void onCachePercentsAvailableChanged(int percents) {
-        if (listener != null) {
-            listener.onCacheAvailable(cache.file, source.getUrl(), percents);
+        if (cacheListener != null) {
+            cacheListener.onCacheAvailable(cache.file, source.getUrl(), percents);
+        }
+    }
+
+    @Override
+    protected void onErrorCache(Throwable throwable) {
+        super.onErrorCache(throwable);
+        if (errorListener != null) {
+            errorListener.onCacheUnavailable(throwable);
         }
     }
 }

Diff for: library/src/main/java/com/danikula/videocache/ProxyCache.java

@@ -101,6 +101,10 @@ private void notifyNewCacheDataAvailable(long cacheAvailable, long sourceAvailab
         }
     }
 
+    private void notifyCacheError(Throwable throwable){
+        onErrorCache(throwable);
+    }
+
     protected void onCacheAvailable(long cacheAvailable, long sourceLength) {
         boolean zeroLengthSource = sourceLength == 0;
         int percents = zeroLengthSource ? 100 : (int) ((float) cacheAvailable / sourceLength * 100);
@@ -115,6 +119,10 @@ protected void onCacheAvailable(long cacheAvailable, long sourceLength) {
     protected void onCachePercentsAvailableChanged(int percentsAvailable) {
     }
 
+    protected void onErrorCache(Throwable throwable) {
+        // do nothing
+    }
+
     private void readSource() {
         long sourceAvailable = -1;
         long offset = 0;
@@ -139,9 +147,12 @@ private void readSource() {
         } catch (Throwable e) {
             readSourceErrorsCount.incrementAndGet();
             onError(e);
+            notifyCacheError(e);
         } finally {
             closeSource();
-            notifyNewCacheDataAvailable(offset, sourceAvailable);
+            synchronized (wc) {
+                wc.notifyAll();
+            }
         }
     }