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/*
 * Copyright (c) 1998-2018 Caucho Technology -- all rights reserved
 *
 * This file is part of Resin(R) Open Source
 *
 * Each copy or derived work must preserve the copyright notice and this
 * notice unmodified.
 *
 * Resin Open Source is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * Resin Open Source is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
 * of NON-INFRINGEMENT.  See the GNU General Public License for more
 * details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Resin Open Source; if not, write to the
 *
 *   Free Software Foundation, Inc.
 *   59 Temple Place, Suite 330
 *   Boston, MA 02111-1307  USA
 *
 * @author Scott Ferguson
 */

package com.caucho.bam.query;

import java.io.Serializable;

import com.caucho.bam.broker.Broker;

/**
 * QuerySender is a convenience API for an Actor to send and manage
 * queries.
 */
public interface QuerySender {
  /**
   * Returns the Actor's address used for all "from" parameters.
   */
  public String getAddress();


  /**
   * The underlying broker.
   */
  public Broker getBroker();

  //
  // message handling
  //

  /**
   * Sends a unidirectional message to an {@link com.caucho.bam.actor.ActorHolder},
   * addressed by the Actor's address.
   *
   * @param to the target actor's address
   * @param payload the message payload
   */
  public void message(String to, Serializable payload);

  //
  // query handling
  //
  
  public QueryManager getQueryManager();

  /**
   * Sends a query information call (get) to an actor,
   * blocking until the actor responds with a result or an error.
   *
   * The target actor of a queryGet acts as a service and the
   * caller acts as a client.  Because BAM Actors are symmetrical, all
   * Actors can act as services and clients for different RPC calls.
   *
   * The target actor MUST send a queryResult or
   * queryError to the client using the same id,
   * because RPC clients rely on a response.
   *
   * @param to the target actor's address
   * @param payload the query payload
   */
  public Serializable query(String to,
                            Serializable payload);

  /**
   * Sends a query information call to an actor,
   * blocking until the actor responds with a result or an error.
   *
   * The target actor of a query acts as a service and the
   * caller acts as a client.  Because BAM Actors are symmetrical, all
   * Actors can act as services and clients for different RPC calls.
   *
   * The target actor MUST send a queryResult or
   * queryError to the client using the same id,
   * because RPC clients rely on a response.
   *
   * @param to the target actor's address
   * @param payload the query payload
   * @param timeout time spent waiting for the query to return
   */
  public Serializable query(String to,
                            Serializable payload,
                            long timeout);

  /**
   * Sends a query information call (get) to an actor,
   * providing a callback to receive the result or error.
   *
   * The target actor of a queryGet acts as a service and the
   * caller acts as a client.  Because BAM Actors are symmetrical, all
   * Actors can act as services and clients for different RPC calls.
   *
   * The target actor MUST send a queryResult or
   * queryError to the client using the same id,
   * because RPC clients rely on a response.
   *
   * @param to the target actor's address
   * @param payload the query payload
   * @param callback the application's callback for the result
   */
  public void query(String to,
                    Serializable payload,
                    QueryCallback callback);

  /**
   * Sends a query information call (get) to an actor,
   * providing a callback to receive the result or error.
   *
   * The target actor of a queryGet acts as a service and the
   * caller acts as a client.  Because BAM Actors are symmetrical, all
   * Actors can act as services and clients for different RPC calls.
   *
   * The target actor MUST send a queryResult or
   * queryError to the client using the same id,
   * because RPC clients rely on a response.
   *
   * @param to the target actor's address
   * @param payload the query payload
   * @param callback the application's callback for the result
   */
  public void query(String to,
                    Serializable payload,
                    QueryCallback callback,
                    long timeout);
}