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added sample webapp with monitoring servlet
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21 changes: 21 additions & 0 deletions
21
samples/org.linkedin.glu.samples.sample-webapp/build.gradle
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| /* | ||
| * Copyright (c) 2010-2011 LinkedIn, Inc | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); you may not | ||
| * use this file except in compliance with the License. You may obtain a copy of | ||
| * the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT | ||
| * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the | ||
| * License for the specific language governing permissions and limitations under | ||
| * the License. | ||
| */ | ||
|
|
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| apply plugin: 'war' | ||
|
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| dependencies { | ||
| providedCompile spec.external.servletApi | ||
| } |
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37
....glu.samples.sample-webapp/src/main/java/org/linkedin/glu/samples/webapp/HomeServlet.java
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| /* | ||
| * Copyright (c) 2010-2011 LinkedIn, Inc | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); you may not | ||
| * use this file except in compliance with the License. You may obtain a copy of | ||
| * the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT | ||
| * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the | ||
| * License for the specific language governing permissions and limitations under | ||
| * the License. | ||
| */ | ||
|
|
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| package org.linkedin.glu.samples.webapp; | ||
|
|
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| import javax.servlet.ServletException; | ||
| import javax.servlet.http.HttpServlet; | ||
| import javax.servlet.http.HttpServletRequest; | ||
| import javax.servlet.http.HttpServletResponse; | ||
| import java.io.IOException; | ||
|
|
||
| /** | ||
| * @author yan@pongasoft.com | ||
| */ | ||
| public class HomeServlet extends HttpServlet | ||
| { | ||
| @Override | ||
| protected void doGet(HttpServletRequest request, | ||
| HttpServletResponse response) | ||
| throws ServletException, IOException | ||
| { | ||
| request.getRequestDispatcher("/home.jsp").forward(request, response); | ||
| } | ||
| } |
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107
...u.samples.sample-webapp/src/main/java/org/linkedin/glu/samples/webapp/MonitorServlet.java
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| /* | ||
| * Copyright (c) 2010-2011 LinkedIn, Inc | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); you may not | ||
| * use this file except in compliance with the License. You may obtain a copy of | ||
| * the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT | ||
| * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the | ||
| * License for the specific language governing permissions and limitations under | ||
| * the License. | ||
| */ | ||
|
|
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| package org.linkedin.glu.samples.webapp; | ||
|
|
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| import javax.servlet.ServletException; | ||
| import javax.servlet.http.HttpServlet; | ||
| import javax.servlet.http.HttpServletRequest; | ||
| import javax.servlet.http.HttpServletResponse; | ||
| import java.io.IOException; | ||
|
|
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| /** | ||
| * @author yan@pongasoft.com | ||
| */ | ||
| public class MonitorServlet extends HttpServlet | ||
| { | ||
| public static enum MonitorState | ||
| { | ||
| GOOD("Everything is fine"), | ||
| BUSY("Application is overloaded (recoverable)"), | ||
| DEAD("Application is in a dead state (non recoverable)"); | ||
|
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| private final String _description; | ||
|
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| private MonitorState(String description) | ||
| { | ||
| _description = description; | ||
| } | ||
|
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| public String getDescription() | ||
| { | ||
| return _description; | ||
| } | ||
| } | ||
|
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| public static final String WEBAPP_STATE_ATTRIBUTE = "monitor.webapp.state"; | ||
|
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| public void init() throws ServletException | ||
| { | ||
| getServletContext().setAttribute(WEBAPP_STATE_ATTRIBUTE, MonitorState.GOOD); | ||
| } | ||
|
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| @Override | ||
| protected void doHead(HttpServletRequest request, HttpServletResponse response) | ||
| throws ServletException, IOException | ||
| { | ||
| MonitorState state = (MonitorState) getServletContext().getAttribute(WEBAPP_STATE_ATTRIBUTE); | ||
|
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| int responseCode; | ||
|
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| switch(state) | ||
| { | ||
| case GOOD: | ||
| responseCode = HttpServletResponse.SC_OK; | ||
| break; | ||
|
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| case BUSY: | ||
| responseCode = HttpServletResponse.SC_SERVICE_UNAVAILABLE; | ||
| break; | ||
|
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| case DEAD: | ||
| responseCode = HttpServletResponse.SC_INTERNAL_SERVER_ERROR; | ||
| break; | ||
|
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| default: | ||
| throw new RuntimeException("not reached"); | ||
| } | ||
|
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| response.setHeader("X-glu-monitoring", state.name()); | ||
|
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| response.sendError(responseCode, state.name()); | ||
| } | ||
|
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| @Override | ||
| protected void doGet(HttpServletRequest request, HttpServletResponse response) | ||
| throws ServletException, IOException | ||
| { | ||
| request.getRequestDispatcher("/monitor.jsp").forward(request, response); | ||
| } | ||
|
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| @Override | ||
| protected void doPost(HttpServletRequest request, HttpServletResponse response) | ||
| throws ServletException, IOException | ||
| { | ||
| String newState = request.getParameter(WEBAPP_STATE_ATTRIBUTE); | ||
|
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| if(newState != null) | ||
| { | ||
| getServletContext().setAttribute(WEBAPP_STATE_ATTRIBUTE, MonitorState.valueOf(newState)); | ||
| } | ||
|
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| response.sendRedirect("monitor"); | ||
| } | ||
| } |
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42
...u.samples.sample-webapp/src/main/java/org/linkedin/glu/samples/webapp/SampleListener.java
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| /* | ||
| * Copyright (c) 2010-2011 LinkedIn, Inc | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); you may not | ||
| * use this file except in compliance with the License. You may obtain a copy of | ||
| * the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT | ||
| * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the | ||
| * License for the specific language governing permissions and limitations under | ||
| * the License. | ||
| */ | ||
|
|
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| package org.linkedin.glu.samples.webapp; | ||
|
|
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| import javax.servlet.ServletContextEvent; | ||
| import javax.servlet.ServletContextListener; | ||
|
|
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| /** | ||
| * @author yan@pongasoft.com | ||
| */ | ||
| public class SampleListener implements ServletContextListener | ||
| { | ||
|
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| // Public constructor is required by servlet spec | ||
| public SampleListener() | ||
| { | ||
| } | ||
|
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| public void contextInitialized(ServletContextEvent sce) | ||
| { | ||
| sce.getServletContext().log("Initializing sample webapp..."); | ||
| } | ||
|
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| public void contextDestroyed(ServletContextEvent sce) | ||
| { | ||
| sce.getServletContext().log("Sample webapp destroyed."); | ||
| } | ||
| } |
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samples/org.linkedin.glu.samples.sample-webapp/src/main/webapp/WEB-INF/web.xml
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| <?xml version="1.0" encoding="UTF-8"?> | ||
| <!-- | ||
| ~ Copyright (c) 2010-2011 LinkedIn, Inc | ||
| ~ | ||
| ~ Licensed under the Apache License, Version 2.0 (the "License"); you may not | ||
| ~ use this file except in compliance with the License. You may obtain a copy of | ||
| ~ the License at | ||
| ~ | ||
| ~ http://www.apache.org/licenses/LICENSE-2.0 | ||
| ~ | ||
| ~ Unless required by applicable law or agreed to in writing, software | ||
| ~ distributed under the License is distributed on an "AS IS" BASIS, WITHOUT | ||
| ~ WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the | ||
| ~ License for the specific language governing permissions and limitations under | ||
| ~ the License. | ||
| --> | ||
|
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| <web-app xmlns="http://java.sun.com/xml/ns/javaee" | ||
| xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" | ||
| xsi:schemaLocation="http://java.sun.com/xml/ns/javaee | ||
| http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" | ||
| version="2.5"> | ||
| <listener> | ||
| <listener-class>org.linkedin.glu.samples.webapp.SampleListener</listener-class> | ||
| </listener> | ||
|
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| <servlet> | ||
| <servlet-name>HomeServlet</servlet-name> | ||
| <servlet-class>org.linkedin.glu.samples.webapp.HomeServlet</servlet-class> | ||
| </servlet> | ||
| <servlet> | ||
| <servlet-name>MonitorServlet</servlet-name> | ||
| <servlet-class>org.linkedin.glu.samples.webapp.MonitorServlet</servlet-class> | ||
| </servlet> | ||
|
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| <servlet-mapping> | ||
| <servlet-name>HomeServlet</servlet-name> | ||
| <url-pattern>/home</url-pattern> | ||
| </servlet-mapping> | ||
| <servlet-mapping> | ||
| <servlet-name>MonitorServlet</servlet-name> | ||
| <url-pattern>/monitor</url-pattern> | ||
| </servlet-mapping> | ||
| </web-app> |
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samples/org.linkedin.glu.samples.sample-webapp/src/main/webapp/home.jsp
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| <%-- | ||
| ~ Copyright (c) 2010-2011 LinkedIn, Inc | ||
| ~ | ||
| ~ Licensed under the Apache License, Version 2.0 (the "License"); you may not | ||
| ~ use this file except in compliance with the License. You may obtain a copy of | ||
| ~ the License at | ||
| ~ | ||
| ~ http://www.apache.org/licenses/LICENSE-2.0 | ||
| ~ | ||
| ~ Unless required by applicable law or agreed to in writing, software | ||
| ~ distributed under the License is distributed on an "AS IS" BASIS, WITHOUT | ||
| ~ WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the | ||
| ~ License for the specific language governing permissions and limitations under | ||
| ~ the License. | ||
| --%> | ||
|
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| <html> | ||
| <head> | ||
| <title>Home - Sample Webapp</title> | ||
| </head> | ||
| <body> | ||
| Welcome home! | ||
| </body> | ||
| </html> |
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samples/org.linkedin.glu.samples.sample-webapp/src/main/webapp/monitor.jsp
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| <%@ page import="org.linkedin.glu.samples.webapp.MonitorServlet" %> | ||
| <%-- | ||
| ~ Copyright (c) 2010-2011 LinkedIn, Inc | ||
| ~ | ||
| ~ Licensed under the Apache License, Version 2.0 (the "License"); you may not | ||
| ~ use this file except in compliance with the License. You may obtain a copy of | ||
| ~ the License at | ||
| ~ | ||
| ~ http://www.apache.org/licenses/LICENSE-2.0 | ||
| ~ | ||
| ~ Unless required by applicable law or agreed to in writing, software | ||
| ~ distributed under the License is distributed on an "AS IS" BASIS, WITHOUT | ||
| ~ WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the | ||
| ~ License for the specific language governing permissions and limitations under | ||
| ~ the License. | ||
| --%> | ||
| <html> | ||
| <head> | ||
| <title>Monitor - Sample Webapp</title> | ||
| <style type="text/css"> | ||
| table { | ||
| padding-top: 2em; | ||
| } | ||
| td { | ||
| border: solid 1px black; | ||
| } | ||
| .GOOD { | ||
| color: green; | ||
| } | ||
| .BUSY { | ||
| color: orange; | ||
| } | ||
| .DEAD { | ||
| color: red; | ||
| } | ||
| </style> | ||
| </head> | ||
| <body> | ||
| <%! MonitorServlet.MonitorState currentState; %> | ||
| <% currentState = (MonitorServlet.MonitorState) | ||
| getServletConfig().getServletContext().getAttribute(MonitorServlet.WEBAPP_STATE_ATTRIBUTE); %> | ||
| <h1>Monitor</h1> | ||
| Current state reported: | ||
| <span class="<%= currentState %>" style="font-weight: bold; font-size: 2em;"> | ||
| <%= currentState %> | ||
| </span> | ||
|
|
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| <form method="POST" action="monitor"> | ||
| <table> | ||
| <tr> | ||
| <th>Select One</th> | ||
| <th>Value</th> | ||
| <th>Description</th> | ||
| </tr> | ||
|
|
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| <% for(MonitorServlet.MonitorState state : MonitorServlet.MonitorState.values()) { %> | ||
| <tr> | ||
| <td> | ||
| <input type="radio" | ||
| name="<%= MonitorServlet.WEBAPP_STATE_ATTRIBUTE %>" | ||
| value="<%= state %>" | ||
| <%= currentState == state ? "checked" : ""%>> | ||
| </td> | ||
| <td><%= state %></td> | ||
| <td><%= state.getDescription() %></td> | ||
| </tr> | ||
| <% } %> | ||
|
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| <tr> | ||
| <td colspan="3"> | ||
| <input type="submit" name="changeState" value="Change monitor state"/> | ||
| </td> | ||
| </tr> | ||
| </table> | ||
| </form> | ||
| </body> | ||
| </html> |
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