Examples with RequestIdentifier edu.umass.cs.gigapaxos.interfaces.RequestIdentifier used on opensource projects

Example 1 with RequestIdentifier

use of edu.umass.cs.gigapaxos.interfaces.RequestIdentifier in project GNS by MobilityFirst.

the class GNSApp method execute.

/**
   *
   * @param request
   * @param doNotReplyToClient
   * @return true if the command is successfully executed
   */
@SuppressWarnings("unchecked")
// we explicitly check type
@Override
public boolean execute(Request request, boolean doNotReplyToClient) {
    boolean executed = false;
    if (executeNoop(request)) {
        return true;
    }
    try {
        Packet.PacketType packetType = request.getRequestType() instanceof Packet.PacketType ? (Packet.PacketType) request.getRequestType() : null;
        GNSConfig.getLogger().log(Level.FINE, "{0} starting execute({1}) doNotReplyToClient={2}", new Object[] { this, request.getSummary(), doNotReplyToClient });
        Request prev = null;
        // arun: enqueue request, dequeue before returning
        if (request instanceof RequestIdentifier) {
            if (enqueueCommand()) {
                prev = this.outstanding.putIfAbsent(((RequestIdentifier) request).getRequestID(), request);
            }
        } else {
            assert (false) : this + " should not be getting requests that do not implement " + RequestIdentifier.class;
        }
        switch(packetType) {
            case SELECT_REQUEST:
                Select.handleSelectRequest((SelectRequestPacket) request, this);
                break;
            case SELECT_RESPONSE:
                Select.handleSelectResponse((SelectResponsePacket) request, this);
                break;
            case COMMAND:
                CommandHandler.handleCommandPacket((CommandPacket) request, doNotReplyToClient, this);
                break;
            case ADMIN_COMMAND:
                CommandHandler.handleCommandPacket((AdminCommandPacket) request, doNotReplyToClient, this);
                break;
            default:
                assert (false) : (this + " should not be getting packets of type " + packetType + "; exiting");
                GNSConfig.getLogger().log(Level.SEVERE, " Packet type not found: {0}", request.getSummary());
                return false;
        }
        executed = true;
        // arun: always clean up all created state upon exiting
        if (request instanceof RequestIdentifier && prev == null) {
            GNSConfig.getLogger().log(Level.FINE, "{0} finished execute({1})  ->  {2}", new Object[] { this, request.getSummary(), request instanceof ClientRequest && ((ClientRequest) request).getResponse() != null ? ((ClientRequest) request).getResponse().getSummary() : null });
            this.outstanding.remove(((RequestIdentifier) request).getRequestID());
        }
    } catch (JSONException | IOException | ClientException | InternalRequestException e) {
        e.printStackTrace();
    } catch (FailedDBOperationException e) {
        // all database operations throw this exception, therefore we keep
        // throwing this exception upwards and catch this
        // here.
        // A database operation error would imply that the application
        // hasn't been able to successfully execute
        // the request. therefore, this method returns 'false', hoping that
        // whoever calls handleDecision would retry
        // the request.
        GNSConfig.getLogger().log(Level.SEVERE, "Error handling request: {0}", request.toString());
        e.printStackTrace();
    }
    return executed;
}