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/*
 * Copyright (C) 2016-2018 SignalFx, Inc. All rights reserved.
 */
package com.signalfx.signalflow;

import java.util.Map;

/**
 * Interface for transports to the SignalFlow API
 *
 * @author dgriff
 */
public interface SignalFlowTransport {

    /**
     * Default host for signalflow
     */
    String DEFAULT_HOST = "stream.signalfx.com";

    /**
     * Attach to an existing SignalFlow computation.
     *
     * @param handle
     *            computation id
     * @param parameters
     *            computation parameters
     * @return An open channel attached to the given computation.
     */
    Channel attach(String handle, Map parameters);

    /**
     * Execute the given SignalFlow program and stream the output back.
     *
     * @param program
     *            computation written in signalflow language
     * @param parameters
     *            computation parameters
     * @return An open channel attached to the newly started computation.
     */
    Channel execute(String program, Map parameters);

    /**
     * Execute a preflight of the given SignalFlow program and stream the output back.
     *
     * @param program
     *            computation written in signalflow language
     * @param parameters
     *            computation parameters
     * @return An open channel attached to the newly started preflight computation.
     */
    Channel preflight(String program, Map parameters);

    /**
     * Start executing the given SignalFlow program without being attached to the output of the
     * computation.
     *
     * @param program
     *            computation written in signalflow language
     * @param parameters
     *            computation parameters
     */
    void start(String program, Map parameters);

    /**
     * Stop a SignalFlow computation.
     *
     * @param handle
     *            computation id
     * @param parameters
     *            computation parameter
     */
    void stop(String handle, Map parameters);

    /**
     * Close this SignalFlow transport.
     *
     * @param code
     *            numeric error id
     * @param reason
     *            Optional description of why closing
     */
    void close(int code, String reason);

    /**
     * Keep-alive a SignalFlow computation.
     *
     * @param handle
     *            computation id
     */
    void keepalive(String handle);
}