Examples with StreamCOWEntry org.corfudb.protocols.logprotocol.StreamCOWEntry used on opensource projects

Example 1 with StreamCOWEntry

use of org.corfudb.protocols.logprotocol.StreamCOWEntry in project CorfuDB by CorfuDB.

the class StreamsView method copy.

/**
     * Make a copy-on-append copy of a stream.
     *
     * @param source      The UUID of the stream to make a copy of.
     * @param destination The UUID of the destination stream. It must not exist.
     * @return A view
     */
public IStreamView copy(UUID source, UUID destination, long timestamp) {
    boolean written = false;
    while (!written) {
        TokenResponse tokenResponse = runtime.getSequencerView().nextToken(Collections.singleton(destination), 1);
        if (tokenResponse.getBackpointerMap().get(destination) != null && Address.isAddress(tokenResponse.getBackpointerMap().get(destination))) {
            // Reading from this address will cause a hole fill
            runtime.getAddressSpaceView().read(tokenResponse.getTokenValue());
            throw new RuntimeException("Stream already exists!");
        }
        StreamCOWEntry entry = new StreamCOWEntry(source, timestamp);
        TokenResponse cowToken = new TokenResponse(tokenResponse.getTokenValue(), tokenResponse.getEpoch(), Collections.singletonMap(destination, Address.COW_BACKPOINTER));
        try {
            runtime.getAddressSpaceView().write(cowToken, entry);
            written = true;
        } catch (OverwriteException oe) {
            log.debug("hole fill during COW entry append, retrying...");
        }
    }
    return get(destination);
}

Example 2 with StreamCOWEntry

use of org.corfudb.protocols.logprotocol.StreamCOWEntry in project CorfuDB by CorfuDB.

the class AbstractContextStreamView method processEntryForContext.

/** Check if the given entry adds a new context, and update
     * the global pointer.
     *
     * If it does, add it to the context stack. Otherwise,
     * pop the context.
     *
     * It is important that this method be called in order, since
     * it updates the global pointer and can change the global pointer.
     *
     * @param data  The entry to process.
     * @return      True, if this entry adds a context.
     */
protected boolean processEntryForContext(final ILogData data) {
    if (data != null) {
        final Object payload = data.getPayload(runtime);
        // If this is a COW entry, we update the context as well.
        if (payload instanceof StreamCOWEntry) {
            StreamCOWEntry ce = (StreamCOWEntry) payload;
            pushNewContext(ce.getOriginalStream(), ce.getFollowUntil());
            return true;
        }
    }
    return false;
}