Examples with Cursor org.cojen.tupl.Cursor used on opensource projects

Example 1 with Cursor

use of org.cojen.tupl.Cursor in project Tupl by cojen.

the class CompressedPageArray method isEmpty.

@Override
public boolean isEmpty() throws IOException {
    Cursor c = mPages.newCursor(Transaction.BOGUS);
    c.first();
    boolean isEmpty = c.key() == null;
    c.reset();
    return isEmpty;
}

Example 2 with Cursor

use of org.cojen.tupl.Cursor in project Tupl by cojen.

the class CompressedPageArray method writePage.

@Override
public void writePage(long index, long srcPtr, int offset) throws IOException {
    try (Cursor c = mPages.newAccessor(Transaction.BOGUS, keyFor(index))) {
        var entry = mCompressors.access();
        try {
            PageCompressor compressor = entry.get();
            int len = compressor.compress(srcPtr, offset, pageSize());
            c.valueWrite(0, compressor.compressedBytes(), 0, len);
        } finally {
            entry.release();
        }
    }
}

Example 3 with Cursor

use of org.cojen.tupl.Cursor in project Tupl by cojen.

the class CompressedPageArray method writePage.

@Override
public void writePage(long index, byte[] src, int offset) throws IOException {
    try (Cursor c = mPages.newAccessor(Transaction.BOGUS, keyFor(index))) {
        var entry = mCompressors.access();
        try {
            PageCompressor compressor = entry.get();
            int len = compressor.compress(src, offset, pageSize());
            c.valueWrite(0, compressor.compressedBytes(), 0, len);
        } finally {
            entry.release();
        }
    }
}

Example 4 with Cursor

use of org.cojen.tupl.Cursor in project Tupl by cojen.

the class CompressedPageArray method pageCount.

@Override
public long pageCount() throws IOException {
    Cursor c = mPages.newCursor(Transaction.BOGUS);
    c.last();
    byte[] key = c.key();
    c.reset();
    return key == null ? 0 : (indexFor(key) + 1);
}

Example 5 with Cursor

use of org.cojen.tupl.Cursor in project Tupl by cojen.

the class Primer method prime.

private void prime() {
    try {
        Cursor c = mView.newCursor(Transaction.BOGUS);
        try {
            c.autoload(false);
            while (true) {
                byte[] key;
                synchronized (this) {
                    if (mFinished) {
                        return;
                    }
                    int len = mDin.readUnsignedShort();
                    if (len == 0xffff) {
                        mFinished = true;
                        return;
                    }
                    key = new byte[len];
                    mDin.readFully(key);
                    if (mTaskCount < mTaskLimit)
                        spawn: {
                            try {
                                Runner.start(this::prime);
                            } catch (Throwable e) {
                                break spawn;
                            }
                            mTaskCount++;
                        }
                }
                c.findNearby(key);
            }
        } catch (IOException e) {
            synchronized (this) {
                if (mEx == null) {
                    mEx = e;
                }
            }
        } finally {
            c.reset();
        }
    } finally {
        synchronized (this) {
            mTaskCount--;
            notifyAll();
        }
    }
}