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/* * @(#)Request.java 1.26 05/11/17 * * Copyright 2006 Sun Microsystems, Inc. All rights reserved. * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms. */ package org.omg.CORBA; /** * An object containing the information necessary for * invoking a method. This class is * the cornerstone of the ORB Dynamic * Invocation Interface (DII), which allows dynamic creation and * invocation of requests. * A server cannot tell the difference between a client * invocation using a client stub and a request using the DII. * <P> * A <code>Request</code> object consists of: * <UL> * <LI>the name of the operation to be invoked * <LI>an <code>NVList</code> containing arguments for the operation.<BR> * Each item in the list is a <code>NamedValue</code> object, which has three * parts: * <OL> * <LI>the name of the argument * <LI>the value of the argument (as an <code>Any</code> object) * <LI>the argument mode flag indicating whether the argument is * for input, output, or both * </OL> * </UL> * <P> * <code>Request</code> objects may also contain additional information, * depending on how an operation was defined in the original IDL * interface definition. For example, where appropriate, they may contain * a <code>NamedValue</code> object to hold the return value or exception, * a context, a list of possible exceptions, and a list of * context strings that need to be resolved. * <P> * New <code>Request</code> objects are created using one of the * <code>create_request</code> methods in the <code>Object</code> class. * In other words, a <code>create_request</code> method is performed on the * object which is to be invoked. * * @see org.omg.CORBA.NamedValue * * @version 1.13 09/09/97 */ public abstract class Request { /** * Retrieves the the target object reference. * * @return the object reference that points to the * object implementation for the method * to be invoked */ public abstract org.omg.CORBA.Object target(); /** * Retrieves the name of the method to be invoked. * * @return the name of the method to be invoked */ public abstract String operation(); /** * Retrieves the <code>NVList</code> object containing the arguments * to the method being invoked. The elements in the list are * <code>NamedValue</code> objects, with each one describing an argument * to the method. * * @return the <code>NVList</code> object containing the arguments * for the method * */ public abstract NVList arguments(); /** * Retrieves the <code>NamedValue</code> object containing the return * value for the method. * * @return the <code>NamedValue</code> object containing the result * of the method */ public abstract NamedValue result(); /** * Retrieves the <code>Environment</code> object for this request. * It contains the exception that the method being invoked has * thrown (after the invocation returns). * * * @return the <code>Environment</code> object for this request */ public abstract Environment env(); /** * Retrieves the <code>ExceptionList</code> object for this request. * This list contains <code>TypeCode</code> objects describing the * exceptions that may be thrown by the method being invoked. * * @return the <code>ExceptionList</code> object describing the exceptions * that may be thrown by the method being invoked */ public abstract ExceptionList exceptions(); /** * Retrieves the <code>ContextList</code> object for this request. * This list contains context <code>String</code>s that need to * be resolved and sent with the invocation. * * * @return the list of context strings whose values * need to be resolved and sent with the * invocation. */ public abstract ContextList contexts(); /** * Retrieves the <code>Context</code> object for this request. * This is a list of properties giving information about the * client, the environment, or the circumstances of this request. * * @return the <code>Context</code> object that is to be used * to resolve any context strings whose * values need to be sent with the invocation */ public abstract Context ctx(); /** * Sets this request's <code>Context</code> object to the one given. * * @param c the new <code>Context</code> object to be used for * resolving context strings */ public abstract void ctx(Context c); /** * Creates an input argument and adds it to this <code>Request</code> * object. * * @return an <code>Any</code> object that contains the * value and typecode for the input argument added */ public abstract Any add_in_arg(); /** * Creates an input argument with the given name and adds it to * this <code>Request</code> object. * * @param name the name of the argument being added * @return an <code>Any</code> object that contains the * value and typecode for the input argument added */ public abstract Any add_named_in_arg(String name); /** * Adds an input/output argument to this <code>Request</code> object. * * @return an <code>Any</code> object that contains the * value and typecode for the input/output argument added */ public abstract Any add_inout_arg(); /** * Adds an input/output argument with the given name to this * <code>Request</code> object. * * @param name the name of the argument being added * @return an <code>Any</code> object that contains the * value and typecode for the input/output argument added */ public abstract Any add_named_inout_arg(String name); /** * Adds an output argument to this <code>Request</code> object. * * @return an <code>Any</code> object that contains the * value and typecode for the output argument added */ public abstract Any add_out_arg(); /** * Adds an output argument with the given name to this * <code>Request</code> object. * * @param name the name of the argument being added * @return an <code>Any</code> object that contains the * value and typecode for the output argument added */ public abstract Any add_named_out_arg(String name); /** * Sets the typecode for the return * value of the method. * * @param tc the <code>TypeCode</code> object containing type information * for the return value */ public abstract void set_return_type(TypeCode tc); /** * Returns the <code>Any</code> object that contains the value for the * result of the method. * * @return an <code>Any</code> object containing the value and * typecode for the return value */ public abstract Any return_value(); /** * Makes a synchronous invocation using the * information in the <code>Request</code> object. Exception information is * placed into the <code>Request</code> object's environment object. */ public abstract void invoke(); /** * Makes a oneway invocation on the * request. In other words, it does not expect or wait for a * response. Note that this can be used even if the operation was * not declared as oneway in the IDL declaration. No response or * exception information is returned. */ public abstract void send_oneway(); /** * Makes an asynchronous invocation on * the request. In other words, it does not wait for a response before it * returns to the user. The user can then later use the methods * <code>poll_response</code> and <code>get_response</code> to get * the result or exception information for the invocation. */ public abstract void send_deferred(); /** * Allows the user to determine * whether a response has been received for the invocation triggered * earlier with the <code>send_deferred</code> method. * * @return <code>true</code> if the method response has * been received; <code>false</code> otherwise */ public abstract boolean poll_response(); /** * Allows the user to access the * response for the invocation triggered earlier with the * <code>send_deferred</code> method. * * @exception WrongTransaction if the method <code>get_response</code> was invoked * from a different transaction's scope than the one from which the * request was originally sent. See the OMG Transaction Service specification * for details. */ public abstract void get_response() throws WrongTransaction; };