From 7c67f7a7154cc4da2c53aeb338d9bff2cbc3985a Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Dominik=20Sch=C3=BCrmann?= Date: Tue, 9 Sep 2014 09:26:03 +0200 Subject: Consolidate on database upgrade --- .../keychain/util/ParcelableFileCache.java | 207 +++++++++++++++++++++ 1 file changed, 207 insertions(+) create mode 100644 OpenKeychain/src/main/java/org/sufficientlysecure/keychain/util/ParcelableFileCache.java (limited to 'OpenKeychain/src/main/java/org/sufficientlysecure/keychain/util/ParcelableFileCache.java') diff --git a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/util/ParcelableFileCache.java b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/util/ParcelableFileCache.java new file mode 100644 index 000000000..111bf0124 --- /dev/null +++ b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/util/ParcelableFileCache.java @@ -0,0 +1,207 @@ +/* + * Copyright (C) 2014 Dominik Schürmann + * + * This program is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see . + */ + +package org.sufficientlysecure.keychain.util; + +import android.content.Context; +import android.os.Parcel; +import android.os.Parcelable; + +import org.sufficientlysecure.keychain.Constants; +import org.sufficientlysecure.keychain.KeychainApplication; + +import java.io.DataInputStream; +import java.io.DataOutputStream; +import java.io.EOFException; +import java.io.File; +import java.io.FileInputStream; +import java.io.FileNotFoundException; +import java.io.FileOutputStream; +import java.io.IOException; +import java.util.ArrayList; +import java.util.Iterator; +import java.util.List; + +/** + * When sending large data (over 1MB) through Androids Binder IPC you get + * JavaBinder E !!! FAILED BINDER TRANSACTION !!! + *

+ * To overcome this problem, we cache large Parcelables into a file in our private cache directory + * instead of sending them through IPC. + */ +public class ParcelableFileCache { + + private Context mContext; + + private final String mFilename; + + public ParcelableFileCache(Context context, String filename) { + mContext = context; + mFilename = filename; + } + + public void writeCache(ArrayList selectedEntries) throws IOException { + writeCache(selectedEntries.iterator()); + } + + public void writeCache(Iterator it) throws IOException { + + File cacheDir = mContext.getCacheDir(); + if (cacheDir == null) { + // https://groups.google.com/forum/#!topic/android-developers/-694j87eXVU + throw new IOException("cache dir is null!"); + } + + File tempFile = new File(mContext.getCacheDir(), mFilename); + + DataOutputStream oos = new DataOutputStream(new FileOutputStream(tempFile)); + + while (it.hasNext()) { + Parcel p = Parcel.obtain(); // creating empty parcel object + p.writeParcelable(it.next(), 0); // saving bundle as parcel + byte[] buf = p.marshall(); + oos.writeInt(buf.length); + oos.write(buf); + p.recycle(); + } + + oos.close(); + + } + + public List readCacheIntoList() throws IOException { + ArrayList result = new ArrayList(); + Iterator it = readCache(); + while (it.hasNext()) { + result.add(it.next()); + } + return result; + } + + public Iterator readCache() throws IOException { + return readCache(true); + } + + public Iterator readCache(final boolean deleteAfterRead) throws IOException { + + File cacheDir = mContext.getCacheDir(); + if (cacheDir == null) { + // https://groups.google.com/forum/#!topic/android-developers/-694j87eXVU + throw new IOException("cache dir is null!"); + } + + final File tempFile = new File(cacheDir, mFilename); + final DataInputStream ois; + try { + ois = new DataInputStream(new FileInputStream(tempFile)); + } catch (FileNotFoundException e) { + Log.e(Constants.TAG, "parcel import file not existing", e); + throw new IOException(e); + } + + return new Iterator() { + + E mRing = null; + boolean closed = false; + byte[] buf = new byte[512]; + + private void readNext() { + if (mRing != null || closed) { + return; + } + + try { + + int length = ois.readInt(); + while (buf.length < length) { + buf = new byte[buf.length * 2]; + } + ois.readFully(buf, 0, length); + + Parcel parcel = Parcel.obtain(); // creating empty parcel object + parcel.unmarshall(buf, 0, length); + parcel.setDataPosition(0); + mRing = parcel.readParcelable(KeychainApplication.class.getClassLoader()); + parcel.recycle(); + } catch (EOFException e) { + // aight + close(); + } catch (IOException e) { + Log.e(Constants.TAG, "Encountered IOException during cache read!", e); + } + + } + + @Override + public boolean hasNext() { + readNext(); + return mRing != null; + } + + @Override + public E next() { + readNext(); + try { + return mRing; + } finally { + mRing = null; + } + } + + @Override + public void remove() { + throw new UnsupportedOperationException(); + } + + @Override + public void finalize() throws Throwable { + close(); + super.finalize(); + } + + private void close() { + if (!closed) { + try { + ois.close(); + if (deleteAfterRead) { + //noinspection ResultOfMethodCallIgnored + tempFile.delete(); + } + } catch (IOException e) { + // nvm + } + } + closed = true; + } + + + }; + } + + public boolean delete() throws IOException { + + File cacheDir = mContext.getCacheDir(); + if (cacheDir == null) { + // https://groups.google.com/forum/#!topic/android-developers/-694j87eXVU + throw new IOException("cache dir is null!"); + } + + final File tempFile = new File(cacheDir, mFilename); + return tempFile.delete(); + } + +} -- cgit v1.2.3