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package javax.xml.soap;


/**
 * A point-to-point connection that a client can use for sending messages
 * directly to a remote party (represented by a URL, for instance).
 * 
 * The SOAPConnection class is optional. Some implementations may
 * not implement this interface in which case the call to
 * {@code SOAPConnectionFactory.newInstance()} (see below) will
 * throw an {@code UnsupportedOperationException}.
 * 

 * A client can obtain a {@code SOAPConnection} object using a
 * {@link SOAPConnectionFactory} object as in the following example:
 * 
{@code
 *      SOAPConnectionFactory factory = SOAPConnectionFactory.newInstance();
 *      SOAPConnection con = factory.createConnection();
 * }
 * A {@code SOAPConnection} object can be used to send messages
 * directly to a URL following the request/response paradigm.  That is,
 * messages are sent using the method {@code call}, which sends the
 * message and then waits until it gets a reply.
 *
 * @since 1.6
 */
public abstract class SOAPConnection {

    /**
     * Sends the given message to the specified endpoint and blocks until
     * it has returned the response.
     *
     * @param request the {@code SOAPMessage} object to be sent
     * @param to an {@code Object} that identifies
     *         where the message should be sent. It is required to
     *         support Objects of type
     *         {@code java.lang.String},
     *         {@code java.net.URL}, and when JAXM is present
     *         {@code javax.xml.messaging.URLEndpoint}
     *
     * @return the {@code SOAPMessage} object that is the response to the
     *         message that was sent
     * @throws SOAPException if there is a SOAP error
     */
    public abstract SOAPMessage call(SOAPMessage request,
                                     Object to) throws SOAPException;

    /**
     * Gets a message from a specific endpoint and blocks until it receives,
     *
     * @param to an {@code Object} that identifies where
     *                  the request should be sent. Objects of type
     *                 {@code java.lang.String} and
     *                 {@code java.net.URL} must be supported.
     *
     * @return the {@code SOAPMessage} object that is the response to the
     *                  get message request
     * @throws SOAPException if there is a SOAP error
     * @since 1.6, SAAJ 1.3
     */
    public SOAPMessage get(Object to)
                                throws SOAPException {
        throw new UnsupportedOperationException("All subclasses of SOAPConnection must override get()");
    }

    /**
     * Closes this {@code SOAPConnection} object.
     *
     * @throws SOAPException if there is a SOAP error
     */
    public abstract void close()
        throws SOAPException;
}