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/* Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.camunda.bpm.connect;

import java.util.Map;

/**
 * A connector request. The request opens an interaction with the connector.
 * Because a request represents a single interaction, the request is not threadsafe.
 * Request objects should not be shared between multiple threads.
 *
 * The parameters of a request can be provided using the generic map of input
 * parameters. See ({@link #setRequestParameters(Map)}):
 * 
 *  SomeConnectorRequest req = connector.createRequest();
 *  req.setRequestParameter("endpointUrl", "http://mysystem.loc/foo");
 *  req.setRequestParameter("payload", "some important payload");
 *  req.execute();
 * 
 * This makes it possible to use the connector in a generic / configurable system like
 * the camunda process engine.
 * 
 *
 * Optionally, a connector may also extend the request interface and provide
 * dedicated (typesafe) methods for configuring a request, preferably in a
 * fluent API fashion:
 * 
 *  conntector.createRequest()
 *    .endpointUrl("http://mysystem.loc/foo")
 *    .payload("some important payload")
 *    .execute();
 * 
 * This makes it easy to use the connector in a standalone way.
 * 
 *
 * The request may return a value representing the output of the connector
 * invocation. Requests not returning a value should be of type {@link Void}.
 *
 * @author Daniel Meyer
 *
 */
public interface ConnectorRequest {

  /**
   * Provides the named input parameters of the request.
   *
   * @param the named input parameters of the request.
   */
  void setRequestParameters(Map params);

  /**
   * Provides a named input parameters to the request.
   * @param name the name of the parameter
   * @param value the value of the parameter
   */
  void setRequestParameter(String name, Object value);

  /**
   * Returns the map of request parameters
   * @return the map of request parameters
   */
  Map getRequestParameters();

  /**
   * Returns the value of a request parameter
   * @param the name of the request parameter
   * @return the value of the request parameter of 'null' if the parameter is not set.
   */
   V getRequestParameter(String name);

  /**
   * Execute the request. Once a request is configured with all input
   * parameters, it can be executed.
   *
   * @return the return value of the request.
   */
  T execute();

}