content: /*******************************************************************************
   * Copyright 2011-2013 Sergey Tarasevich
   *
   * 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.nostra13.universalimageloader.core;
  
  import android.content.Context;
  import com.nostra13.universalimageloader.cache.disc.DiskCache;
  import com.nostra13.universalimageloader.cache.disc.impl.UnlimitedDiscCache;
  import com.nostra13.universalimageloader.cache.disc.impl.ext.LruDiscCache;
  import com.nostra13.universalimageloader.cache.disc.naming.FileNameGenerator;
  import com.nostra13.universalimageloader.cache.disc.naming.HashCodeFileNameGenerator;
  import com.nostra13.universalimageloader.cache.memory.MemoryCache;
  import com.nostra13.universalimageloader.cache.memory.impl.LruMemoryCache;
  import com.nostra13.universalimageloader.core.assist.QueueProcessingType;
  import com.nostra13.universalimageloader.core.assist.deque.LIFOLinkedBlockingDeque;
  import com.nostra13.universalimageloader.core.decode.BaseImageDecoder;
  import com.nostra13.universalimageloader.core.decode.ImageDecoder;
  import com.nostra13.universalimageloader.core.display.BitmapDisplayer;
  import com.nostra13.universalimageloader.core.display.SimpleBitmapDisplayer;
  import com.nostra13.universalimageloader.core.download.BaseImageDownloader;
  import com.nostra13.universalimageloader.core.download.ImageDownloader;
  import com.nostra13.universalimageloader.utils.L;
  import com.nostra13.universalimageloader.utils.StorageUtils;
  
  import java.io.File;
  import java.io.IOException;
  import java.util.concurrent.BlockingQueue;
  import java.util.concurrent.Executor;
  import java.util.concurrent.Executors;
  import java.util.concurrent.LinkedBlockingQueue;
  import java.util.concurrent.ThreadFactory;
  import java.util.concurrent.ThreadPoolExecutor;
  import java.util.concurrent.TimeUnit;
  import java.util.concurrent.atomic.AtomicInteger;
  
  /**
   * Factory for providing of default options for {@linkplain ImageLoaderConfiguration configuration}
   *
   * @author Sergey Tarasevich (nostra13[at]gmail[dot]com)
   * @since 1.5.6
   */
  public class DefaultConfigurationFactory {
  
  	/** Creates default implementation of task executor */
  	public static Executor createExecutor(int threadPoolSize, int threadPriority,
  			QueueProcessingType tasksProcessingType) {
  		boolean lifo = tasksProcessingType == QueueProcessingType.LIFO;
  		BlockingQueue<Runnable> taskQueue =
  				lifo ? new LIFOLinkedBlockingDeque<Runnable>() : new LinkedBlockingQueue<Runnable>();
  		return new ThreadPoolExecutor(threadPoolSize, threadPoolSize, 0L, TimeUnit.MILLISECONDS, taskQueue,
  				createThreadFactory(threadPriority, "uil-pool-"));
  	}
  
  	/** Creates default implementation of task distributor */
  	public static Executor createTaskDistributor() {
  		return Executors.newCachedThreadPool(createThreadFactory(Thread.NORM_PRIORITY, "uil-pool-d-"));
  	}
  
  	/** Creates {@linkplain HashCodeFileNameGenerator default implementation} of FileNameGenerator */
  	public static FileNameGenerator createFileNameGenerator() {
  		return new HashCodeFileNameGenerator();
  	}
  
  	/**
  	 * Creates default implementation of {@link DiskCache} depends on incoming parameters
  	 */
  	public static DiskCache createDiskCache(Context context, FileNameGenerator diskCacheFileNameGenerator,
  			long diskCacheSize, int diskCacheFileCount) {
  		File reserveCacheDir = createReserveDiskCacheDir(context);
  		if (diskCacheSize > 0 || diskCacheFileCount > 0) {
  			File individualCacheDir = StorageUtils.getIndividualCacheDirectory(context);
  			try {
  				return new LruDiscCache(individualCacheDir, reserveCacheDir, diskCacheFileNameGenerator, diskCacheSize,
  						diskCacheFileCount);
  			} catch (IOException e) {
  				L.e(e);
  				// continue and create unlimited cache
  			}
  		}
  		File cacheDir = StorageUtils.getCacheDirectory(context);
  		return new UnlimitedDiscCache(cacheDir, reserveCacheDir, diskCacheFileNameGenerator);
  	}
  
  	/** Creates reserve disk cache folder which will be used if primary disk cache folder becomes unavailable */
  	private static File createReserveDiskCacheDir(Context context) {
  		File cacheDir = StorageUtils.getCacheDirectory(context, false);
  		File individualDir = new File(cacheDir, "uil-images");
  		if (individualDir.exists() || individualDir.mkdir()) {
  			cacheDir = individualDir;
  		}
  		return cacheDir;
  	}
  
  	/**
  	 * Creates default implementation of {@link MemoryCache} - {@link LruMemoryCache}<br />
  	 * Default cache size = 1/8 of available app memory.
  	 */
  	public static MemoryCache createMemoryCache(int memoryCacheSize) {
  		if (memoryCacheSize == 0) {
  			memoryCacheSize = (int) (Runtime.getRuntime().maxMemory() / 8);
  		}
  		return new LruMemoryCache(memoryCacheSize);
  	}
  
  	/** Creates default implementation of {@link ImageDownloader} - {@link BaseImageDownloader} */
  	public static ImageDownloader createImageDownloader(Context context) {
  		return new BaseImageDownloader(context);
  	}
  
  	/** Creates default implementation of {@link ImageDecoder} - {@link BaseImageDecoder} */
  	public static ImageDecoder createImageDecoder(boolean loggingEnabled) {
  		return new BaseImageDecoder(loggingEnabled);
  	}
  
  	/** Creates default implementation of {@link BitmapDisplayer} - {@link SimpleBitmapDisplayer} */
  	public static BitmapDisplayer createBitmapDisplayer() {
  		return new SimpleBitmapDisplayer();
  	}
  
  	/** Creates default implementation of {@linkplain ThreadFactory thread factory} for task executor */
  	private static ThreadFactory createThreadFactory(int threadPriority, String threadNamePrefix) {
  		return new DefaultThreadFactory(threadPriority, threadNamePrefix);
  	}
  
  	private static class DefaultThreadFactory implements ThreadFactory {
  
  		private static final AtomicInteger poolNumber = new AtomicInteger(1);
  
  		private final ThreadGroup group;
  		private final AtomicInteger threadNumber = new AtomicInteger(1);
  		private final String namePrefix;
  		private final int threadPriority;
  
  		DefaultThreadFactory(int threadPriority, String threadNamePrefix) {
  			this.threadPriority = threadPriority;
  			SecurityManager s = System.getSecurityManager();
  			group = (s != null) ? s.getThreadGroup() : Thread.currentThread().getThreadGroup();
  			namePrefix = threadNamePrefix + poolNumber.getAndIncrement() + "-thread-";
  		}
  
  		@Override
  		public Thread newThread(Runnable r) {
  			Thread t = new Thread(group, r, namePrefix + threadNumber.getAndIncrement(), 0);
  			if (t.isDaemon()) t.setDaemon(false);
  			t.setPriority(threadPriority);
  			return t;
  		}
  	}
  }
  