Java SystemProperty類代碼示例

import com.google.appengine.api.utils.SystemProperty; //導入依賴的package包/類
public List<String> getProfiles() {
    List<String> profiles = new ArrayList<>();

    if (isProduction()) {
        String applicationId = SystemProperty.applicationId.get();
        if (StringUtils.isNotBlank(applicationId)) {
            for (Function<String, String> extractorFunction : extractorFunctions) {
                String extracted = extractorFunction.apply(applicationId);
                if (StringUtils.isNotBlank(extracted)) {
                    profiles.add(extracted);
                }
            }
            // We want the original applicationId to be the winning profile as it should be more specific
            profiles.add(applicationId);
        }
    } else {
        profiles.add("local");
    }
    return profiles;
}
 

import com.google.appengine.api.utils.SystemProperty; //導入依賴的package包/類
public void notifyGCMServer(String urlStr, String key) {
  if (SystemProperty.environment.value() == SystemProperty.Environment.Value.Development) {
    // In the development server, don't notify GCM
    LOG.warning("Should notify the GCM server that new data is available, pinging URL "+urlStr);
  } else {
    try {
      URL url = new URL(urlStr);
      if (LOG.isLoggable(Level.INFO)) {
        LOG.info("Pinging GCM at URL: "+url);
      }

      HttpURLConnection connection = (HttpURLConnection) url.openConnection();
      connection.setReadTimeout(1000 * 30); // 30 seconds
      connection.setRequestProperty("Authorization", "key="+key);
      connection.connect();
      int statusCode = connection.getResponseCode();
      if (statusCode < 200 || statusCode >= 300) {
        LOG.severe("Unexpected response code from GCM server: "+statusCode+". "+connection.getResponseMessage());
      }

    } catch (Exception ex) {
      LOG.log(Level.SEVERE, "Unexpected error when pinging GCM server", ex);
    }
  }
}
 

import com.google.appengine.api.utils.SystemProperty; //導入依賴的package包/類
public JsonObject readFileAsJsonObject(GcsFilename file) throws IOException {
  GcsFileMetadata metadata = gcsService.getMetadata(file);
  if (metadata == null) {
    if (SystemProperty.environment.value() == SystemProperty.Environment.Value.Development) {
      // In the development server, try to fetch files on cloud storage via HTTP
      Logger.getAnonymousLogger().info("fetching "+file.getObjectName()+" at "+Config.CLOUD_STORAGE_BASE_URL+file.getObjectName());
      return RemoteJsonHelper.fetchJsonFromPublicURL(Config.CLOUD_STORAGE_BASE_URL+file.getObjectName());
    }
    return null;
  }
  GcsInputChannel readChannel = null;
  try {
    readChannel = gcsService.openReadChannel(file, 0);
    JsonElement element = new JsonParser().parse(Channels.newReader(readChannel,
        DEFAULT_CHARSET_NAME));
    return element.getAsJsonObject();
  } finally {
    if (readChannel != null) {
      readChannel.close();
    }
  }
}
 

import com.google.appengine.api.utils.SystemProperty; //導入依賴的package包/類
/**
 * Gets extra system information to add to logs.
 *
 * @param req HTTP request (may be {@code null})
 */
private static String extraExtraInfo(HttpServletRequest req) {
  StringBuilder s = new StringBuilder();

  // If the app is running on App Engine...
  if (Server.isProductionServer()) {
    // the version ID of the runtime environment
    String version = SystemProperty.version.get();
    s.append("runtime.version").append("=").append(version).append("\n");
    // the application major version number + deploy timestamp
    version = SystemProperty.applicationVersion.get();
    s.append("application.version").append("=").append(version).append("\n");
  }
  s.append("build.version").append("=").append(buildData).append("\n");
  s.append("git.build.version").append("=").append(GitBuildId.getVersion()).append("\n");
  if (req != null) {
    s.append("request.details").append("=").append(req.toString()).append("\n");
  }
  return new String(s);
}
 

import com.google.appengine.api.utils.SystemProperty; //導入依賴的package包/類
/**
 * Returns the timestamp for when the app was deployed (as a Unix time,
 * in milliseconds, suitable for passing to the java.util.Date() constructor
 *
 */
public static long getTimestamp() {
  if (timestamp == 0) {
    // Note: the applicationVersion string has the format version.timestamp
    // The timestamp currently (when this was written) needs to be divided
    // by 2^28 to get it into unix epoch seconds. This could change according
    // to comments I found on the web, but there doesn't seem
    // to be any more stable API to get this info.
    String applicationVersion = SystemProperty.applicationVersion.get();
    if (applicationVersion != null) {
      String parts[] = applicationVersion.split("\\.");
      timestamp = (Long.parseLong(parts[1]) >> 28) * 1000;
      date = new Date(timestamp);
    }
  }
  return timestamp;
}
 

import com.google.appengine.api.utils.SystemProperty; //導入依賴的package包/類
@Override
public JsonElement fetch(Enum<?> entityType, Map<String, String> params)
    throws IOException {
  // On the first call, read all the files
  if (object == null) {
    object = new JsonObject();
    for (String filename: filenames) {
      JsonObject obj = fileManager.readFileAsJsonObject(filename);
      if (obj == null &&
          SystemProperty.environment.value() == SystemProperty.Environment.Value.Development) {
        // In the development server, cloud storage files cannot be directly accessed.
        obj = RemoteJsonHelper.fetchJsonFromPublicURL(Config.CLOUD_STORAGE_BASE_URL + filename);
      }
      if (obj == null) {
        LOGGER.warning("Could not find file "+filename);
      } else {
        for (Entry<String, JsonElement> entry: obj.entrySet()) {
          object.add(entry.getKey(), entry.getValue());
        }
      }
    }
  }
  return object.get(entityType.name());
}
 

import com.google.appengine.api.utils.SystemProperty; //導入依賴的package包/類
/**
 * Method to get the application version.
 *
 * @author <a href="mailto:[email protected]"> João Felipe de Medeiros Moreira </a>
 * @since 13/10/2015
 *
 * @return the application version.
 */
public static String getApplicationVersion() {
  String appVersion = SystemProperty.applicationVersion.get();
  if (!appVersion.contains("$")) {
    String namespace = appVersion;
    String[] version = appVersion.split("\\.");
    if (version.length > 0 && version[0].contains("-")) {
      namespace = version[0].split("-")[0];
    } else if (version.length > 0) {
      namespace = version[0];
    } else {
      namespace = appVersion;
    }
    return namespace;
  }
  return appVersion;
}
 

import com.google.appengine.api.utils.SystemProperty; //導入依賴的package包/類
private void reportDataCheckFailures(CheckResult result, OutputStream optionalOutput) throws IOException {
  StringBuilder errorMessage = new StringBuilder();
  errorMessage.append(
      "\nHey,\n\n"
      + "(this message is autogenerated)\n"
      + "The iosched data updater ran but found some inconsistent data.\n"
      + "Please, check the messages below and fix the sources. "
      + "\n\n" + result.failures.size() + " data non-compliances:\n");
  for (CheckFailure f: result.failures) {
    errorMessage.append(f).append("\n\n");
  }

  if (SystemProperty.environment.value() != SystemProperty.Environment.Value.Development ||
      optionalOutput == null) {
    // send email if user is not running in dev or interactive mode (show=true)
    Message message = new Message();
    message.setSender(Config.EMAIL_TO_SEND_UPDATE_ERRORS);
    message.setSubject("[iosched-data-error] Updater - Inconsistent data");

    message.setTextBody(errorMessage.toString());
    MailServiceFactory.getMailService().sendToAdmins(message);
  } else {
    // dump errors to optionalOutput
    optionalOutput.write(errorMessage.toString().getBytes());
  }
}
 

import com.google.appengine.api.utils.SystemProperty; //導入依賴的package包/類
@Override
public JsonElement fetch(Enum<?> entityType, Map<String, String> params)
    throws IOException {
  // On the first call, read all the files
  if (object == null) {
    object = new JsonObject();
    for (String filename: filenames) {
      JsonObject obj = fileManager.readFileAsJsonObject(filename);
      if (obj == null &&
          SystemProperty.environment.value() == SystemProperty.Environment.Value.Development) {
        // In the development server, cloud storage files cannot be directly accessed.
        obj = RemoteJsonHelper.fetchJsonFromPublicURL(Config.CLOUD_STORAGE_BASE_URL+filename);
      }
      if (obj == null) {
        LOGGER.warning("Could not find file "+filename);
      } else {
        for (Entry<String, JsonElement> entry: obj.entrySet()) {
          object.add(entry.getKey(), entry.getValue());
        }
      }
    }
  }
  return object.get(entityType.name());
}
 

import com.google.appengine.api.utils.SystemProperty; //導入依賴的package包/類
private static EntityManagerFactory newFactory(Map<String, String> extraProperties) {
    
    LOGGER.info("Creating EntityManagerFactory...");
    
    try {

        Map<String, String> properties = new HashMap<>();
        properties.putAll(extraProperties);


        if (SystemProperty.environment.value() == SystemProperty.Environment.Value.Production) {
            properties.put("javax.persistence.jdbc.driver", "com.mysql.jdbc.GoogleDriver");
            properties.put("javax.persistence.jdbc.url", System.getProperty("cloudsql.url"));
        } else {
            properties.put("javax.persistence.jdbc.driver", "com.mysql.jdbc.Driver");
            properties.put("javax.persistence.jdbc.url", System.getProperty("cloudsql.url.dev"));
        }

        properties.put(org.hibernate.ejb.AvailableSettings.INTERCEPTOR, TimingInterceptor.class.getName());

        return Persistence.createEntityManagerFactory("Demo", properties);
    } catch (Exception e) {
        LOGGER.log(Level.SEVERE, "Failed to create EntityManagerFactory", e);
        throw e;
    }
}
 

import com.google.appengine.api.utils.SystemProperty; //導入依賴的package包/類
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException {
    String email = request.getParameter("email");
    String conferenceInfo = request.getParameter("conferenceInfo");
    Properties props = new Properties();
    Session session = Session.getDefaultInstance(props, null);
    String body = "Hi, you have created a following conference.\n" + conferenceInfo;
    try {
        Message message = new MimeMessage(session);
        InternetAddress from = new InternetAddress(
                String.format("[email protected]%s.appspotmail.com",
                        SystemProperty.applicationId.get()), "Conference Central");
        message.setFrom(from);
        message.addRecipient(Message.RecipientType.TO, new InternetAddress(email, ""));
        message.setSubject("You created a new Conference!");
        message.setText(body);
        Transport.send(message);
    } catch (MessagingException e) {
        LOG.log(Level.WARNING, String.format("Failed to send an mail to %s", email), e);
        throw new RuntimeException(e);
    }
}
 

import com.google.appengine.api.utils.SystemProperty; //導入依賴的package包/類
public static void sendEmail(EmailBean email) {
	// TODO send email asynchronously - task queue
	Properties props = new Properties();
       Session session = Session.getDefaultInstance(props, null);

       try {
       	String applicationId=SystemProperty.applicationId.get();
       	log.info("Sending email from "+applicationId+" to "+email.toEmail+" with subject '"+email.subject+"'");
           Message msg = new MimeMessage(session);
           msg.setFrom(new InternetAddress("[email protected]"+applicationId+".appspotmail.com", "MindForger"));
           msg.addRecipient(Message.RecipientType.TO, new InternetAddress(email.toEmail, email.toNickname));
           msg.setSubject(email.subject);
           msg.setText(email.body);
           Transport.send(msg);
       } catch (Exception e) {
           log.severe("Unable to send email to "+email.toEmail+": "+e.getMessage());
       }		
}
 

import com.google.appengine.api.utils.SystemProperty; //導入依賴的package包/類
private void reportDataCheckFailures(CheckResult result, OutputStream optionalOutput) throws IOException {
  StringBuilder errorMessage = new StringBuilder();
  errorMessage.append(
      "\nHey,\n\n"
      + "(this message is autogenerated)\n"
      + "The devfestnorte data updater ran but found some inconsistent data.\n"
      + "Please, check the messages below and fix the sources. "
      + "\n\n" + result.failures.size() + " data non-compliances:\n");
  for (CheckFailure f: result.failures) {
    errorMessage.append(f).append("\n\n");
  }

  if (SystemProperty.environment.value() != SystemProperty.Environment.Value.Development ||
      optionalOutput == null) {
    // send email if user is not running in dev or interactive mode (show=true)
    Message message = new Message();
    message.setSender(Config.EMAIL_TO_SEND_UPDATE_ERRORS);
    message.setSubject("[devfestnorte-data-error] Updater - Inconsistent data");

    message.setTextBody(errorMessage.toString());
    MailServiceFactory.getMailService().sendToAdmins(message);
  } else {
    // dump errors to optionalOutput
    optionalOutput.write(errorMessage.toString().getBytes());
  }
}
 

import com.google.appengine.api.utils.SystemProperty; //導入依賴的package包/類
static RawGcsService createRawGcsService(Map<String, String> headers) {
  ImmutableSet.Builder<HTTPHeader> builder = ImmutableSet.builder();
  if (headers != null) {
    for (Map.Entry<String, String> header : headers.entrySet()) {
      builder.add(new HTTPHeader(header.getKey(), header.getValue()));
    }
  }

  RawGcsService rawGcsService;
  Value location = SystemProperty.environment.value();
  if (location == SystemProperty.Environment.Value.Production || hasCustomAccessTokenProvider()) {
    rawGcsService = OauthRawGcsServiceFactory.createOauthRawGcsService(builder.build());
  } else if (location == SystemProperty.Environment.Value.Development) {
    rawGcsService = LocalRawGcsServiceFactory.createLocalRawGcsService();
  } else {
    Delegate<?> delegate = ApiProxy.getDelegate();
    if (delegate == null
        || delegate.getClass().getName().startsWith("com.google.appengine.tools.development")) {
      rawGcsService = LocalRawGcsServiceFactory.createLocalRawGcsService();
    } else {
      rawGcsService = OauthRawGcsServiceFactory.createOauthRawGcsService(builder.build());
    }
  }
  return rawGcsService;
}