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/* Request.java --
   Copyright (C) 2005, 2006 Free Software Foundation, Inc.
 
This file is part of GNU Classpath.
 
GNU Classpath 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, or (at your option)
any later version.
 
GNU Classpath 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.  See the GNU
General Public License for more details.
 
You should have received a copy of the GNU General Public License
along with GNU Classpath; see the file COPYING.  If not, write to the
Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301 USA.
 
Linking this library statically or dynamically with other modules is
making a combined work based on this library.  Thus, the terms and
conditions of the GNU General Public License cover the whole
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As a special exception, the copyright holders of this library give you
permission to link this library with independent modules to produce an
executable, regardless of the license terms of these independent
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terms of your choice, provided that you also meet, for each linked
independent module, the terms and conditions of the license of that
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or based on this library.  If you modify this library, you may extend
this exception to your version of the library, but you are not
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exception statement from your version. */
 
 
package org.omg.CORBA;
 
 
/**
 * An object, containing the information, needed to invoke the method of
 * the local or remote CORBA object. The Request is used in
 * Dynamic Invocation Interface (DII) which allows dynamic creation of
 * requests.
 *
 * @author Audrius Meskauskas (AudriusA@Bioinformatics.org)
 */
public abstract class Request
{
  /**
   * Add the named input parameter that passes value to
   * the method being invoked. This is similar to the "passing by value"
   * conception.
   *
   * The created parameter is returned allowing to set the value.
   *
   * @return the created parameter.
   */
  public abstract Any add_in_arg();
 
  /**
   * Add the input/output parameter that passes value both to and from
   * the method being invoked. This is similar to the "passing by reference"
   * conception.
   *
   * The created parameter is returned allowing to set the value.
   *
   * @return the created parameter.
   */
  public abstract Any add_inout_arg();
 
  /**
   * Add the named input parameter that passes value to
   * the method being invoked. This is similar to the "passing by value"
   * conception.
   *
   * The created parameter is returned allowing to set the value.
   *
   * @param name the parameter name.
   *
   * @return the created parameter.
   */
  public abstract Any add_named_in_arg(String name);
 
  /**
   * Add the named input/output parameter that passes value both to and from
   * the method being invoked. This is similar to the "passing by reference"
   * conception.
   *
   * The created parameter is returned allowing to set the value.
   *
   * @param name the parameter name.
   *
   * @return the created parameter.
   */
  public abstract Any add_named_inout_arg(String name);
 
  /**
   * Add the named output parameter that passes value from
   * the method being invoked. Differently from the java
   * language, the CORBA IDL method can return multiple values.
   *
   * The created parameter is returned allowing to set the value.
   *
   * @param name the parameter name.
   *
   * @return the created parameter.
   */
  public abstract Any add_named_out_arg(String name);
 
  /**
   * Add the output parameter that passes value from
   * the method being invoked. Differently from the java
   * language, the CORBA IDL method can return multiple values.
   *
   * The created parameter is returned allowing to set the value.
   *
   * @return the created parameter.
   */
  public abstract Any add_out_arg();
 
  /**
   * Return the list of all previously added parameters.
   *
   * @return the list of parameters.
   */
  public abstract NVList arguments();
 
  /**
   * Get the context list object for this request.
   *
   * @return a list of strings that must be resolved and sent with the
   * invocation.
   */
  public abstract ContextList contexts();
 
  /**
   * Get the context, previously set using {@link #ctx(Context)}.
   * The context contains the details about this request.
   */
  public abstract Context ctx();
 
  /**
   * Set the context that shuld be later returned by {@link #ctx()}.
   * This context contains the details about this request.
   *
   * @param a_context a context to set.
   */
  public abstract void ctx(Context a_context);
 
  /**
   * Returns the container, eclosing an exception that the invoked method
   * has thrown.
   *
   * @return the Environment object, containng the exception.
   */
  public abstract Environment env();
 
  /**
   * List the exceptions that may be thrown by the CORBA object method being
   * invoked.
   *
   * @return the list of exceptions.
   */
  public abstract ExceptionList exceptions();
 
  /**
   * Allow to access the response that has been previously sent using
   * {@link #send_deferred()}.
   *
   * @throws WrongTransaction if the transaction scope mismatches.
   */
  public abstract void get_response()
                             throws WrongTransaction;
 
  /**
   * Submit the request, suspending the current thread until the
   * answer is received.
   */
  public abstract void invoke();
 
  /**
   * Get the name of the method being invoked.
   *
   * @return the name of the method being invoked.
   */
  public abstract String operation();
 
  /**
   * Check if the response is received to the request that was
   * previously send using {@link #send_deferred()}.
   *
   * @return true if the response has been already received, false otherwise.
   */
  public abstract boolean poll_response();
 
  /**
   * Get the value, returned by the method, together with its name.
   *
   * @return the value, returned by the method.
   */
  public abstract NamedValue result();
 
  /**
   * Get the value, returned by the method.
   *
   * @return the value, returned by the method.
   */
  public abstract Any return_value();
 
  /**
   * Send a request without suspending the current thread.
   *
   * Allow later check of the request status by {@link #poll_response()} and
   * retrieving the results by {@link #get_response()}.
   */
  public abstract void send_deferred();
 
  /**
   * Send a request and forget about it, not waiting for a response.
   * This can be done also for methods that normally are expected
   * to return some values.
   */
  public abstract void send_oneway();
 
  /**
   * Set the return type.
   *
   * @param returns the type of the value, returned in response to this
   * request.
   */
  public abstract void set_return_type(TypeCode returns);
 
  /**
   * Return the CORBA object on that the method would be invoked.
   *
   * @return the invocation target.
   */
  public abstract org.omg.CORBA.Object target();
}