/**
* *****************************************************************************
* Copyright 2012 University of Southern California
*
* 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.
*
* This code was developed by the Information Integration Group as part of the
* Karma project at the Information Sciences Institute of the University of
* Southern California. For more information, publications, and related
* projects, please see: http://www.isi.edu/integration
*****************************************************************************
*/
package edu.isi.karma.webserver;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import edu.isi.karma.controller.command.CommandType;
import edu.isi.karma.controller.update.HistoryUpdate;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import edu.isi.karma.controller.command.Command;
import edu.isi.karma.controller.command.CommandException;
import edu.isi.karma.controller.command.IPreviewable;
import edu.isi.karma.controller.update.ErrorUpdate;
import edu.isi.karma.controller.update.UpdateContainer;
import edu.isi.karma.view.VWorkspace;
import edu.isi.karma.view.VWorkspaceRegistry;
public class RequestController extends HttpServlet {
private static final long serialVersionUID = 1L;
private static Logger logger = LoggerFactory.getLogger(RequestController.class);
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String workspaceId = request.getParameter("workspaceId");
ExecutionController ctrl = WorkspaceRegistry.getInstance().getExecutionController(workspaceId);
if (ctrl == null) {
logger.debug("No execution controller found. This sometime happens when the server is restarted and "
+ "an already open window is refereshed (and is okay to happen). A command is sent to the server "
+ "to destroy all workspace objects.");
return;
}
VWorkspace vWorkspace = VWorkspaceRegistry.getInstance().getVWorkspace(workspaceId);
String responseString;
boolean isPreview = Boolean.parseBoolean(request.getParameter("isPreview"));
boolean isUserInteraction = Boolean.parseBoolean(request.getParameter("isUserInteraction"));
boolean isExecute = Boolean.parseBoolean(request.getParameter("execute"));
if (isUserInteraction) {
String commandId = request.getParameter("commandId");
Command currentCommand = (Command) ctrl.getWorkspace().getCommandHistory().getPreviewCommand(commandId);
try {
UpdateContainer updateContainer;
if (!isExecute)
updateContainer = ((IPreviewable) currentCommand).handleUserActions(request);
else {
((IPreviewable) currentCommand).handleUserActions(request);
updateContainer = ctrl.invokeCommand(currentCommand);
}
updateContainer.applyUpdates(vWorkspace);
responseString = updateContainer.generateJson(vWorkspace);
} catch (Exception e) {
responseString = getErrorMessage(vWorkspace, e);
}
}
else if (isPreview) {
Command command = ctrl.getCommand(request);
try {
UpdateContainer updateContainer = ((IPreviewable) command).showPreview(request);
ctrl.getWorkspace().getCommandHistory().addPreviewCommand(command);
updateContainer.applyUpdates(vWorkspace);
responseString = updateContainer.generateJson(vWorkspace);
} catch (CommandException e) {
responseString = getErrorMessage(vWorkspace, e);
}
}
else {
Command command = ctrl.getCommand(request);
try {
UpdateContainer updateContainer =ctrl.invokeCommand(command);
if (command.getCommandType() != CommandType.notInHistory) {
updateContainer.add(new HistoryUpdate(vWorkspace.getWorkspace().getCommandHistory()));
}
updateContainer.applyUpdates(vWorkspace);
responseString = updateContainer.generateJson(vWorkspace);
} catch(Exception e) {
responseString = getErrorMessage(vWorkspace, e);
}
}
response.setCharacterEncoding("UTF-8");
response.getWriter().write(responseString);
response.setContentType("application/json");
response.flushBuffer();
}
private String getErrorMessage(VWorkspace vWorkspace, Throwable e) {
e.printStackTrace();
UpdateContainer updateContainer = new UpdateContainer();
updateContainer.add(new ErrorUpdate("Error:" + e.getMessage()));
return updateContainer.generateJson(vWorkspace);
}
}