Fix thumb load

app/src/main/java/com/hippo/conaco/ValueHelper.java

@@ -0,0 +1,55 @@
+/*
+ * Copyright 2016 Hippo Seven
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.hippo.conaco;
+
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+
+import com.hippo.streampipe.InputStreamPipe;
+
+public interface ValueHelper<V> {
+
+    /**
+     * Decode object for the {@code InputStreamPipe}
+     *
+     * @param isPipe the {@code InputStreamPipe}
+     * @return the decoded object
+     */
+    @Nullable
+    V decode(@NonNull InputStreamPipe isPipe);
+
+    /**
+     * Get the size of the object
+     */
+    int sizeOf(@NonNull String key, @NonNull V value);
+
+    /**
+     * Called when the object added to memory cache
+     */
+    void onAddToMemoryCache(@NonNull V oldValue);
+
+    /**
+     * Called when the object removed from memory cache
+     */
+    void onRemoveFromMemoryCache(@NonNull String key, @NonNull V oldValue);
+
+    /**
+     * Use cache memory or not. Sometimes large object
+     * should not be stored in memory cache.
+     */
+    boolean useMemoryCache(@NonNull String key, V holder);
+}