/**
* Process the user's http get request. Process the template that maps to the URI that was hit.
*
* @param request the user's http request
* @param response the user's http response
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
if (processStatus(request, response)) {
return;
}
if (!isRunning()) {
int errorCode = mProperties.getInt("startup.codes.error", 503);
response.sendError(errorCode);
return;
}
if (mUseSpiderableRequest) {
request =
new SpiderableRequest(request, mQuerySeparator, mParameterSeparator, mValueSeparator);
}
// start transaction
TeaServletTransaction tsTrans = getEngine().createTransaction(request, response, true);
// load associated request/response
ApplicationRequest appRequest = tsTrans.getRequest();
ApplicationResponse appResponse = tsTrans.getResponse();
// process template
processTemplate(appRequest, appResponse);
appResponse.finish();
// flush the output
response.flushBuffer();
}
/**
* Inserts a plugin to expose parts of the teaservlet via the EngineAccess interface.
*
* <p>private void createEngineAccessPlugin(PluginContext context) {
*
* <p>Plugin engineAccess = new EngineAccessPlugin(this); context.addPlugin(engineAccess);
* context.addPluginListener(engineAccess); }
*/
private boolean processResource(ApplicationRequest appRequest, ApplicationResponse appResponse)
throws IOException {
// get the associated system path
String requestURI = null;
if ((requestURI = appRequest.getPathInfo()) == null) {
String context = appRequest.getContextPath();
requestURI = appRequest.getRequestURI();
if (requestURI.startsWith(context)) {
requestURI = requestURI.substring(context.length());
}
}
// check for valid asset
Asset asset = getEngine().getAssetEngine().getAsset(requestURI);
if (asset == null) {
return false;
}
// set mime type
appResponse.setContentType(asset.getMimeType());
// write contents
int read = -1;
byte[] contents = new byte[1024];
InputStream input = asset.getInputStream();
ServletOutputStream output = appResponse.getOutputStream();
while ((read = input.read(contents)) >= 0) {
output.write(contents, 0, read);
}
// complete response
appResponse.finish();
// success
return true;
}
/**
* Creates a transaction from the provided request and response and then processes that
* transaction by executing the target template.
*
* @param request the user's http request
* @param response the user's http response
*/
private boolean processTemplate(ApplicationRequest appRequest, ApplicationResponse appResponse)
throws IOException {
// check if redirect or erroring out
if (appResponse.isRedirectOrError()) {
return false;
}
// set initial content type and helper attributes
appResponse.setContentType("text/html");
appRequest.setAttribute(this.getClass().getName(), this);
// lookup template
Template template = (Template) appRequest.getTemplate();
// process as resource if no template available
if (template == null) {
if (!processResource(appRequest, appResponse)) {
appResponse.sendError(404);
return false;
}
return true;
}
long endTime = 0L;
long startTime = 0L;
long contentLength = 0;
TemplateStats templateStats = null;
if (mInstrumentationEnabled) {
templateStats = mTeaServletRequestStats.getStats(template.getName());
}
try {
Object[] params = null;
try {
if (templateStats != null) {
templateStats.incrementServicing();
}
// Fill in the parameters to pass to the template.
Class<?>[] paramTypes = template.getParameterTypes();
if (paramTypes.length == 0) {
params = NO_PARAMS;
} else {
params = new Object[paramTypes.length];
String[] paramNames = template.getParameterNames();
for (int i = 0; i < paramNames.length; i++) {
String paramName = paramNames[i];
if (paramName == null) {
continue;
}
Class<?> paramType = paramTypes[i];
if (!paramType.isArray()) {
String value = appRequest.getParameter(paramName);
if (value == null || paramType == String.class) {
params[i] = value;
} else {
params[i] = convertParameter(value, paramType);
}
} else {
String[] values = appRequest.getParameterValues(paramName);
if (values == null || paramType == String[].class) {
params[i] = values;
} else {
paramType = paramType.getComponentType();
Object converted = Array.newInstance(paramType, values.length);
params[i] = converted;
for (int j = 0; j < values.length; j++) {
Array.set(converted, j, convertParameter(values[j], paramType));
}
}
}
}
}
startTime = System.currentTimeMillis();
try {
try {
appRequest.getTemplate().execute(appResponse.getHttpContext(), params);
} catch (ContextCreationException cce) {
// unwrap the inner exception
throw (Exception) cce.getUndeclaredThrowable();
}
} catch (AbortTemplateException e) {
if (DEBUG) {
mLog.debug("Template execution aborted!");
mLog.debug(e);
}
} catch (RuntimeException e) {
if (getEngine().getTemplateSource().isExceptionGuardianEnabled()) {
// Just log the error and use what the template wrote out.
mLog.error(e);
} else {
throw new ServletException(e);
}
} catch (IOException e) {
// TODO: shouldn't we be throwing this as a ServletException?
// otherwise its not logged to the TeaLog.
throw e;
} catch (ServletException e) {
throw e;
} catch (Exception e) {
throw new ServletException(e);
}
// TODO: shouldn't we be catching errors and not just exceptions?
// otherwise its not logged to the TeaLog.
finally {
endTime = System.currentTimeMillis();
if (appRequest instanceof TeaServletStats) {
long duration = endTime - startTime;
((TeaServletStats) appRequest).setTemplateDuration(duration);
}
}
if (DEBUG) {
mLog.debug("Finished executing template");
}
} catch (ServletException e) {
// Log exception
StringBuffer msg = new StringBuffer();
msg.append("Error processing request for ");
msg.append(appRequest.getRequestURI());
if (appRequest.getQueryString() != null) {
msg.append('?');
msg.append(appRequest.getQueryString());
}
mLog.error(msg.toString());
Throwable t = e;
while (t instanceof ServletException) {
e = (ServletException) t;
if (e.getRootCause() != null) {
String message = e.getMessage();
if (message != null && message.length() > 0) {
mLog.error(message);
}
mLog.error(t = e.getRootCause());
} else {
mLog.error(e);
break;
}
}
// Internal server error unless header is already set
if (!appResponse.isRedirectOrError()) {
String displayMessage = e.getLocalizedMessage();
if (displayMessage == null || displayMessage.length() == 0) {
appResponse.sendError(ApplicationResponse.SC_INTERNAL_SERVER_ERROR);
} else {
appResponse.sendError(ApplicationResponse.SC_INTERNAL_SERVER_ERROR, displayMessage);
}
}
}
contentLength = appResponse.getResponseBuffer().getByteCount();
appResponse.finish();
if (templateStats != null) {
templateStats.decrementServicing();
templateStats.log(startTime, endTime, contentLength, params);
}
} catch (Exception e) {
if (templateStats != null) {
templateStats.decrementServicing();
}
}
return true;
}
