/**
* Process connection response data.
*
* @param conn connection to read response data from.
* @return assembled response as string.
* @throws IOException on I/O error
*/
private StringBuilder readResponse(URLConnection conn) throws IOException {
StringBuilder retval = new StringBuilder();
HttpURLConnection http = (HttpURLConnection) conn;
int resp = 200;
try {
resp = http.getResponseCode();
} catch (Throwable ex) {
}
if (resp >= 200 && resp < 300) {
BufferedReader input = null;
try {
input = new BufferedReader(new InputStreamReader(conn.getInputStream()));
} catch (Throwable ex) {
retval.append(ex.toString());
return retval;
}
String line = null;
while ((line = input.readLine()) != null) {
retval.append(line);
retval.append("\n");
}
input.close();
} else {
retval.append(http.getResponseMessage());
}
LogContext.getLogger().finer(String.format("<-- HTTP Response: %d: %s", resp, retval));
return retval;
}
private void testConnection() throws IOException {
// Test database connection.
URLConnection conn = makeTestConnection();
if (conn != null) {
conn.connect();
StringBuilder buf = readResponse(conn);
buf.insert(0, "Experiment confirmation: ");
LogContext.getLogger().fine(buf.toString());
}
}
/**
* {@inheritDoc}
*
* @see edu.mcmaster.maplelab.common.datamodel.TrialLogger#saveSessionConfig()
*/
public void saveSessionConfig() throws IOException {
// Save session configuration data.
URLConnection conn = makeSaveConfigConnection();
if (conn == null) return;
conn.setDoOutput(true);
conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
Map<String, String> fields = new HashMap<String, String>();
fields.put("config", getSession().toPropertiesString());
String row = encode(fields);
LogContext.getLogger().finer("-> config log: " + row);
if (getSession().getExperimentDBKey() >= 0) {
OutputStreamWriter out = null;
try {
out = new OutputStreamWriter(conn.getOutputStream());
out.write(row);
out.flush();
} finally {
if (out != null) out.close();
}
conn.connect();
readResponse(conn);
}
}
/**
* Attempt to make errors generated when 3D not available a little nicer. {@inheritDoc}
*
* @see java.awt.Component#addNotify()
*/
@Override
public void addNotify() {
try {
super.addNotify();
} catch (UnsatisfiedLinkError ex) {
LogContext.getLogger()
.warning("Sorry, 3D model rendering has not been enabled " + "for this platform.");
ex.printStackTrace();
}
}
/**
* Setup a connection to the server
*
* @param path format encoded path string (relative to base URL)
* @param pathArgs arguments to String.format() for path
* @return opened connection
* @throws IOException on setup error
*/
protected URLConnection initConnection(String path, Object... pathArgs) throws IOException {
URL url = null;
try {
url = new URL(_base + String.format(path, pathArgs));
LogContext.getLogger().finer("--> Initializing HTTP connection: " + url);
} catch (MalformedURLException ex) {
throw (IOException) new IOException("Couldn't create test URL: " + url).initCause(ex);
}
URLConnection retval = url.openConnection();
retval.setUseCaches(false);
retval.setDoInput(true);
return retval;
}
/**
* Convenience function for converting a map of key-value pairs into a URL query string.
*
* @param fields key-value pairs
* @return query string.
*/
protected static String encode(Map<String, String> fields) {
StringBuilder buf = new StringBuilder();
try {
boolean prev = false;
for (String key : fields.keySet()) {
if (prev) {
buf.append("&");
} else {
prev = true;
}
buf.append(URLEncoder.encode(key, "UTF-8"));
buf.append("=");
buf.append(URLEncoder.encode(fields.get(key), "UTF-8"));
}
} catch (Exception e) {
LogContext.getLogger().log(Level.WARNING, "Problem encoding map.", e);
}
return buf.toString();
}