Java tutorial
/********************************************************************************* * Ephesoft is a Intelligent Document Capture and Mailroom Automation program * developed by Ephesoft, Inc. Copyright (C) 2015 Ephesoft Inc. * * This program is free software; you can redistribute it and/or modify it under * the terms of the GNU Affero General Public License version 3 as published by the * Free Software Foundation with the addition of the following permission added * to Section 15 as permitted in Section 7(a): FOR ANY PART OF THE COVERED WORK * IN WHICH THE COPYRIGHT IS OWNED BY EPHESOFT, EPHESOFT DISCLAIMS THE WARRANTY * OF NON INFRINGEMENT OF THIRD PARTY RIGHTS. * * This program is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS * FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more * details. * * You should have received a copy of the GNU Affero General Public License along with * this program; if not, see http://www.gnu.org/licenses or write to the Free * Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA * 02110-1301 USA. * * You can contact Ephesoft, Inc. headquarters at 111 Academy Way, * Irvine, CA 92617, USA. or at email address info@ephesoft.com. * * The interactive user interfaces in modified source and object code versions * of this program must display Appropriate Legal Notices, as required under * Section 5 of the GNU Affero General Public License version 3. * * In accordance with Section 7(b) of the GNU Affero General Public License version 3, * these Appropriate Legal Notices must retain the display of the "Ephesoft" logo. * If the display of the logo is not reasonably feasible for * technical reasons, the Appropriate Legal Notices must display the words * "Powered by Ephesoft". ********************************************************************************/ package com.ephesoft.dcma.core.service; import java.io.BufferedInputStream; import java.io.IOException; import java.util.Properties; import org.apache.commons.httpclient.HttpClient; import org.apache.commons.httpclient.HttpException; import org.apache.commons.httpclient.HttpStatus; import org.apache.commons.httpclient.methods.GetMethod; import org.springframework.core.io.ClassPathResource; import com.ephesoft.dcma.core.component.ICommonConstants; import com.ephesoft.dcma.util.EphesoftStringUtil; import com.ephesoft.dcma.util.NumberUtil; import com.ephesoft.dcma.util.logger.EphesoftLogger; import com.ephesoft.dcma.util.logger.EphesoftLoggerFactory; public class ServerHeartBeatMonitor { /** * Logger. */ private static final EphesoftLogger LOGGER = EphesoftLoggerFactory.getLogger(ServerHeartBeatMonitor.class); public boolean getServerActiveStatus(final String ipAddress, final String portNumber, final String context, final boolean isSecure) { boolean isActive = false; String pathURL = getURL(ipAddress, portNumber, context, isSecure); isActive = checkHealth(pathURL); if (!isActive) { int noOfPings = 1; try { noOfPings = getNumberOfPings(); } catch (final NumberFormatException nfe) { LOGGER.error(nfe.getMessage()); } for (int index = 1; index < noOfPings; index++) { if (checkHealth(pathURL)) { break; } } } return isActive; } /** * Gets stream to read workflow properties for the server. * * @return {@link BufferedInputStream} * @throws IOException */ private BufferedInputStream getHeartBeatPropertiesReaderStream() throws IOException { BufferedInputStream propertyInputStream = null; String filePath = ICommonConstants.DCMA_HEART_BEAT_PROPERTIES; ClassPathResource classPathResourse = new ClassPathResource(filePath); if (classPathResourse.exists()) { propertyInputStream = new BufferedInputStream(classPathResourse.getInputStream()); } return propertyInputStream; } /** * Gets heart beat number of pings property. * * @return int */ private int getNumberOfPings() { BufferedInputStream propertyInputStream = null; int numberOfPings = 1; try { propertyInputStream = getHeartBeatPropertiesReaderStream(); Properties properties = new Properties(); properties.load(propertyInputStream); String numberOfPingsString = properties.getProperty(ICommonConstants.HEART_BEAT_NUMBER_OF_PINGS); boolean validNumber = NumberUtil.isValidPositiveInteger(numberOfPingsString); if (validNumber) { numberOfPings = Integer.parseInt(numberOfPingsString); } else { LOGGER.error("Server execution capacity is in invalid syntax. It must be a positive integer."); } } catch (IOException inaccessibleFilePath) { LOGGER.error(EphesoftStringUtil.concatenate(ICommonConstants.DCMA_HEART_BEAT_PROPERTIES, " -Properties File is not accessible. Setting to Default Value(1)")); } catch (NumberFormatException wrongPropertyValue) { LOGGER.error(EphesoftStringUtil.concatenate(ICommonConstants.HEART_BEAT_NUMBER_OF_PINGS, " contains Invalid Property Value. Setting to Default Value(1)")); } finally { try { propertyInputStream.close(); } catch (IOException e) { LOGGER.error("Unable to close InputStream."); } } return numberOfPings; } /** * This method will return true if the server is active other wise false. * * @param url {@link String} URL of the Heart beat service. * @return true if the serve is active other wise false. */ private boolean checkHealth(final String serviceURL) { boolean isActive = false; LOGGER.info(serviceURL); if (!EphesoftStringUtil.isNullOrEmpty(serviceURL)) { // Create an instance of HttpClient. HttpClient client = new HttpClient(); client.setConnectionTimeout(30000); client.setTimeout(30000); // Create a method instance. GetMethod method = new GetMethod(serviceURL); try { // Execute the method. int statusCode = client.executeMethod(method); if (statusCode == HttpStatus.SC_OK) { isActive = true; } else { LOGGER.info("Method failed: " + method.getStatusLine()); } } catch (HttpException httpException) { LOGGER.error("Fatal protocol violation: " + httpException.getMessage()); } catch (IOException ioException) { LOGGER.error("Fatal transport error: " + ioException.getMessage()); } finally { // Release the connection. if (method != null) { method.releaseConnection(); } } return isActive; } return isActive; } /** * Returns the url of the heart beat services based on the parameter whether SSL is enabled or not. * * @param serverRegistry {@link ServerRegistry} instance of ServerRegistry. * @return the url of the heartbeat service running. */ private String getURL(final String ipAddress, String portNumber, String context, boolean isSecure) { // String ipAddress = serverRegistry.getIpAddress(); // String portNumber = serverRegistry.getPort(); // String context = serverRegistry.getAppContext(); StringBuilder url = new StringBuilder(); // EphesoftContext.getCurrent().isSecure() if (ipAddress == null || null == portNumber || null == context) { LOGGER.error("Problem in creating. Server Registry Info is Null."); } else { if (isSecure) { url.append(ICommonConstants.HTTPS_SLASH); } else { url.append(ICommonConstants.HTTP_SLASH); } url.append(ipAddress); url.append(ICommonConstants.COLON); url.append(portNumber); if (!context.contains(ICommonConstants.FORWARD_SLASH)) { url.append(ICommonConstants.FORWARD_SLASH); } url.append(context); url.append(ICommonConstants.FORWARD_SLASH); url.append(ICommonConstants.HEALTH_STATUS_HTML); } return url.toString(); } }