Fixes large number of thumbnails leads to low memory (5c7daa81) · Commits · e / os / android_frameworks_base

media/java/android/media/MiniThumbFile.java

+169 −6

Original line number	Diff line number	Diff line
		@@ -53,6 +53,12 @@ public class MiniThumbFile {
		private ByteBuffer mBuffer;
		private static final Hashtable<String, MiniThumbFile> sThumbFiles =
		new Hashtable<String, MiniThumbFile>();
		// Add following members for index file use
		private static final int INDEX_FILE_VERSION = 3;
		public static final int BYTES_PER_INDEX = 8;
		private RandomAccessFile mIndexFile;
		private FileChannel mIndexChannel;
		private ByteBuffer mIndexBuffer;

		/**
		* We store different types of thumbnails in different files. To remain backward compatibility,
		@@ -127,9 +133,59 @@ public class MiniThumbFile {
		return mMiniThumbFile;
		}

		private String indexFilePath(int version) {
		String directoryName =
		Environment.getExternalStorageDirectory().toString()
		+ "/DCIM/.thumbnails";
		return directoryName + "/.thumbindex" + version + "-" + mUri.hashCode();
		}

		private void removeOldIndexFile() {
		String oldPath = indexFilePath(INDEX_FILE_VERSION - 1);
		File oldFile = new File(oldPath);
		if (oldFile.exists()) {
		try {
		oldFile.delete();
		} catch (SecurityException ex) {
		// ignore exception
		}
		}
		}

		private RandomAccessFile indexFile() {
		if (mIndexFile == null) {
		removeOldIndexFile();
		String path = indexFilePath(INDEX_FILE_VERSION);
		File directory = new File(path).getParentFile();
		if (!directory.isDirectory()) {
		if (!directory.mkdirs()) {
		Log.e(TAG, "Unable to create .thumbnails directory "
		+ directory.toString());
		}
		}
		File f = new File(path);
		try {
		mIndexFile = new RandomAccessFile(f, "rw");
		} catch (IOException ex) {
		// Open as read-only so we can at least read the existing
		// thumbnail indexes.
		try {
		mIndexFile = new RandomAccessFile(f, "r");
		} catch (IOException ex2) {
		// ignore exception
		}
		}
		if (mIndexFile != null) {
		mIndexChannel = mIndexFile.getChannel();
		}
		}
		return mIndexFile;
		}

		public MiniThumbFile(Uri uri) {
		mUri = uri;
		mBuffer = ByteBuffer.allocateDirect(BYTES_PER_MINTHUMB);
		mIndexBuffer = ByteBuffer.allocateDirect(BYTES_PER_INDEX);
		}

		public synchronized void deactivate() {
		@@ -141,6 +197,14 @@ public class MiniThumbFile {
		// ignore exception
		}
		}
		if (mIndexFile != null) {
		try {
		mIndexFile.close();
		mIndexFile = null;
		} catch (IOException ex) {
		// ignore exception
		}
		}
		}

		// Get the magic number for the specified id in the mini-thumb file.
		@@ -149,10 +213,43 @@ public class MiniThumbFile {
		// check the mini thumb file for the right data. Right is
		// defined as having the right magic number at the offset
		// reserved for this "id".
		// Firstly, find the position in thumbdata file for this "id" according to index file.
		RandomAccessFile r = miniThumbDataFile();
		if (r != null) {
		long pos = id * BYTES_PER_MINTHUMB;
		RandomAccessFile ri = indexFile();
		if (r != null && ri != null) {
		FileLock lock = null;
		long index = BYTES_PER_INDEX * id;
		long pos = -1;
		try {
		mIndexBuffer.clear();
		mIndexBuffer.limit(8);

		lock = mIndexChannel.lock(index, 8, true);
		// check that we can read the following 8 bytes
		// (8 for the long)
		if (mIndexChannel.read(mIndexBuffer, index) == 8) {
		mIndexBuffer.position(0);
		pos = mIndexBuffer.getLong();
		}
		} catch (IOException ex) {
		Log.v(TAG, "Got exception checking file position: ", ex);
		} catch (RuntimeException ex) {
		// Other NIO related exception like disk full, read only channel..etc
		Log.e(TAG, "Got exception when reading position, id = " + id +
		", disk full or mount read-only? " + ex.getClass());
		} finally {
		try {
		if (lock != null) lock.release();
		}
		catch (IOException ex) {
		// ignore it.
		}
		}

		if (pos < 0) return 0;

		// Secondly, find the magic in thumbdata file according to the position.
		lock = null;
		try {
		mBuffer.clear();
		mBuffer.limit(1 + 8);
		@@ -187,10 +284,43 @@ public class MiniThumbFile {
		public synchronized void saveMiniThumbToFile(byte[] data, long id, long magic)
		throws IOException {
		RandomAccessFile r = miniThumbDataFile();
		if (r == null) return;
		RandomAccessFile ri = indexFile();
		if (r == null \|\| ri == null) return;

		long pos = id * BYTES_PER_MINTHUMB;
		// Firstly, put into index file the position in thumbdata file for this "id".
		FileLock lock = null;
		long index = BYTES_PER_INDEX * id;
		long pos = mMiniThumbFile.length();
		boolean writeIndexSuccess = false;
		try {
		mIndexBuffer.clear();
		mIndexBuffer.putLong(pos);
		mIndexBuffer.flip();

		lock = mIndexChannel.lock(index, BYTES_PER_INDEX, false);
		mIndexChannel.write(mIndexBuffer, index);
		writeIndexSuccess = true;
		} catch (IOException ex) {
		Log.e(TAG, "couldn't save mini thumbnail position for "
		+ id + "; ", ex);
		throw ex;
		} catch (RuntimeException ex) {
		// Other NIO related exception like disk full, read only channel..etc
		Log.e(TAG, "couldn't save mini thumbnail position for "
		+ id + "; disk full or mount read-only? " + ex.getClass());
		} finally {
		try {
		if (lock != null) lock.release();
		}
		catch (IOException ex) {
		// ignore it.
		}
		}

		if (!writeIndexSuccess) return;

		// Secondly, put into thumbdata file thumb data for this "id" according to the position.
		lock = null;
		try {
		if (data != null) {
		if (data.length > BYTES_PER_MINTHUMB - HEADER_SIZE) {
		@@ -234,10 +364,43 @@ public class MiniThumbFile {
		*/
		public synchronized byte [] getMiniThumbFromFile(long id, byte [] data) {
		RandomAccessFile r = miniThumbDataFile();
		if (r == null) return null;
		RandomAccessFile ri = indexFile();
		if (r == null \|\| ri == null) return null;

		long pos = id * BYTES_PER_MINTHUMB;
		// Firstly, find the position in thumbdata file for this "id" according to index file.
		FileLock lock = null;
		long index = BYTES_PER_INDEX * id;
		long pos = -1;
		try {
		mIndexBuffer.clear();
		mIndexBuffer.limit(8);

		lock = mIndexChannel.lock(index, 8, true);
		// check that we can read the following 8 bytes
		// (8 for the long)
		if (mIndexChannel.read(mIndexBuffer, index) == 8) {
		mIndexBuffer.position(0);
		pos = mIndexBuffer.getLong();
		}
		} catch (IOException ex) {
		Log.w(TAG, "got exception when reading position id=" + id + ", exception: " + ex);
		} catch (RuntimeException ex) {
		// Other NIO related exception like disk full, read only channel..etc
		Log.e(TAG, "Got exception when reading position, id = " + id +
		", disk full or mount read-only? " + ex.getClass());
		} finally {
		try {
		if (lock != null) lock.release();
		}
		catch (IOException ex) {
		// ignore it.
		}
		}

		if (pos < 0) return null;

		// Secondly, find the thumb data for this "id" in thumbdata file according to the position.
		lock = null;
		try {
		mBuffer.clear();
		lock = mChannel.lock(pos, BYTES_PER_MINTHUMB, true);