Example usage for android.os CancellationSignal throwIfCanceled

Introduction

In this page you can find the example usage for android.os CancellationSignal throwIfCanceled.

Prototype

public void throwIfCanceled() 

Source Link

Document

Throws OperationCanceledException if the operation has been canceled.

Usage

From source file:net.sf.fdshare.RootFileProvider.java

/**
 * {@inheritDoc}//from   w  ww.j a  va2s.  co m
 *
 * Note, that cancellation is inherently racy. The caller must close whatever Cursor may be returned regardless.
 */
@Override
@SuppressLint("NewApi")
@TargetApi(Build.VERSION_CODES.JELLY_BEAN)
public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs, String sortOrder,
        CancellationSignal signal) {
    Cursor result = null;

    try (Closeable cancellation = new ThreadInterrupter(signal)) {
        result = super.query(uri, projection, selection, selectionArgs, sortOrder);
        return result;
    } catch (IOException ioe) {
        return null;
    } finally {
        if (signal != null && signal.isCanceled()) {
            if (result != null) {
                result.close();
            }

            // override whatever exception have resulted from interruption
            signal.throwIfCanceled();
        }
    }
}

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From source file:org.alfresco.mobile.android.application.providers.storage.StorageAccessDocumentsProvider.java

public static boolean copyFile(InputStream src, long size, File dest, CancellationSignal signal) {
    IOUtils.ensureOrCreatePathAndFile(dest);
    OutputStream os = null;//from  w  ww.j a  v a  2s . c  o m
    boolean copied = true;
    int downloaded = 0;

    try {
        os = new BufferedOutputStream(new FileOutputStream(dest));

        byte[] buffer = new byte[MAX_BUFFER_SIZE];

        while (size - downloaded > 0) {
            if (size - downloaded < MAX_BUFFER_SIZE) {
                buffer = new byte[(int) (size - downloaded)];
            }

            int read = src.read(buffer);
            if (read == -1) {
                break;
            }

            os.write(buffer, 0, read);
            downloaded += read;
            if (signal != null && signal.isCanceled()) {
                signal.throwIfCanceled();
            }
        }
    } catch (Exception e) {
        Log.e(TAG, Log.getStackTraceString(e));
        copied = false;
    } finally {
        IOUtils.closeStream(src);
        IOUtils.closeStream(os);
    }
    return copied;
}

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From source file:net.sf.fdshare.RootFileProvider.java

/**
 * {@inheritDoc}//w w  w.  ja  va  2 s. c  o  m
 *
 * Note, that cancellation is inherently racy. The caller must close whatever descriptor may be returned regardless.
 */
@Override
@SuppressLint("NewApi")
@TargetApi(Build.VERSION_CODES.JELLY_BEAN)
public ParcelFileDescriptor openFile(Uri uri, String mode, CancellationSignal signal)
        throws FileNotFoundException {
    ParcelFileDescriptor result = null;

    try (Closeable cancellation = new ThreadInterrupter(signal)) {
        result = super.openFile(uri, mode);
        return result;
    } catch (IOException ioe) {
        throw new FileNotFoundException(ioe.getMessage());
    } finally {
        if (signal != null && signal.isCanceled()) {
            if (result != null) {
                try {
                    result.close();
                } catch (IOException ignored) {
                }
            }

            // override whatever exception have resulted from interruption
            signal.throwIfCanceled();
        }
    }
}

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