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package com.orbekk.same.http;
import static com.orbekk.same.StackTraceUtil.throwableToString;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.orbekk.same.ClientInterface;
import com.orbekk.same.UpdateConflict;
import com.orbekk.same.Variable;
import com.orbekk.same.VariableFactory;
public class StateServlet extends HttpServlet {
private Logger logger = LoggerFactory.getLogger(getClass());
private ClientInterface client;
private VariableFactory variableFactory;
private final static String TITLE = "State viewer";
public StateServlet(ClientInterface client,
VariableFactory variableFactory) {
this.client = client;
this.variableFactory = variableFactory;
}
private void handleSetState(HttpServletRequest request,
HttpServletResponse response) throws IOException {
if (request.getParameter("key") == null ||
request.getParameter("value") == null) {
response.getWriter().println(
"Usage: action=set&key=DesiredKey&value=DesiredValue");
}
try {
String key = request.getParameter("key");
String value = request.getParameter("value");
Variable<String> variable = variableFactory.createString(key);
variable.set(value);
response.getWriter().println("Updated component: " +
key + "=" + value);
} catch (UpdateConflict e) {
response.getWriter().println("Update conflict: " +
throwableToString(e));
}
}
@Override
protected void doGet(HttpServletRequest request,
HttpServletResponse response) throws IOException {
if ("set".equals(request.getParameter("action"))) {
handleSetState(request, response);
response.sendRedirect(request.getServletPath() + "?message=OK");
} else {
response.setContentType("text/html; charset=utf8");
writeHeader(response);
if (request.getParameter("message") != null) {
response.getWriter().println("<p>");
response.getWriter().println(request.getParameter("message"));
}
writeState(response);
writeSetStateForm(response);
writeFooter(response);
response.setStatus(HttpServletResponse.SC_OK);
}
}
private void writeState(HttpServletResponse response) throws IOException {
PrintWriter w = response.getWriter();
w.println("<h2>State</h2>");
w.println("<pre>");
w.println(client.getState());
w.println("</pre>");
}
private void writeSetStateForm(HttpServletResponse response)
throws IOException {
PrintWriter w = response.getWriter();
w.println("<h3>Change state</h3>");
w.println("<form name=\"stateInput\" action=\"\">");
w.println("<p>Key: <input type=\"text\" name=\"key\" />");
w.println("<p>Value: <input type=\"text\" name=\"value\" />");
w.println("<input type=\"hidden\" name=\"action\" value=\"set\" />");
w.println("<p><input type=\"submit\" value=\"Sumbit\" />");
w.println("</form>");
}
private void writeHeader(HttpServletResponse response) throws IOException {
PrintWriter w = response.getWriter();
w.println("<html>");
w.println("<head>");
w.println("<title>" + TITLE + "</title>");
w.println("</head>");
w.println("<body>");
}
private void writeFooter(HttpServletResponse response) throws IOException {
PrintWriter w = response.getWriter();
w.println("</body>");
w.println("</html>");
}
}
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