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Commit for sample webapp using async servlets.
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‎managedvms/async-rest/LICENSE

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Apache License
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Version 2.0, January 2004
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http://www.apache.org/licenses/
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‎managedvms/async-rest/pom.xml

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<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<groupId>com.google.appengine.demos</groupId>
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<artifactId>async-rest</artifactId>
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<version>1.0.0-SNAPSHOT</version>
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<packaging>war</packaging>
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<name>Example Async Rest Webapp</name>
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<properties>
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<jetty.version>9.3.5.v20151012</jetty.version>
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</properties>
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<build>
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<plugins>
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<plugin>
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<artifactId>maven-compiler-plugin</artifactId>
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<version>3.3</version>
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<configuration>
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<source>1.7</source>
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<target>1.7</target>
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</configuration>
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</plugin>
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<plugin>
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<groupId>org.eclipse.jetty</groupId>
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<artifactId>jetty-maven-plugin</artifactId>
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<version>${jetty.version}</version>
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</plugin>
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<plugin>
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<groupId>com.google.appengine</groupId>
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<artifactId>gcloud-maven-plugin</artifactId>
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<version>2.0.9.90.v20151210</version>
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<configuration>
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</configuration>
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</plugin>
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</plugins>
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</build>
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<dependencies>
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<dependency>
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<groupId>org.eclipse.jetty</groupId>
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<artifactId>jetty-client</artifactId>
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<version>${jetty.version}</version>
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</dependency>
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<dependency>
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<groupId>org.eclipse.jetty</groupId>
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<artifactId>jetty-util-ajax</artifactId>
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<version>${jetty.version}</version>
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</dependency>
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<dependency>
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<groupId>org.eclipse.jetty</groupId>
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<artifactId>jetty-webapp</artifactId>
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<version>${jetty.version}</version>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>javax.servlet</groupId>
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<artifactId>javax.servlet-api</artifactId>
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<scope>provided</scope>
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<version>3.1.0</version>
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</dependency>
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</dependencies>
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</project>

‎managedvms/async-rest/src/main/java/com/google/appengine/demos/asyncrest/AbstractRestServlet.java

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package com.google.appengine.demos.asyncrest;
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import java.io.IOException;
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import java.math.BigDecimal;
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import java.math.RoundingMode;
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import java.net.URLEncoder;
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import java.util.Iterator;
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import java.util.Map;
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import java.util.Queue;
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import javax.servlet.ServletConfig;
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import javax.servlet.ServletException;
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import javax.servlet.http.HttpServlet;
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import javax.servlet.http.HttpServletRequest;
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import javax.servlet.http.HttpServletResponse;
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/**
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* Abstract Servlet implementation class AsyncRESTServlet.
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* Enquires ebay REST service for auctions by key word.
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* May be configured with init parameters: <dl>
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* <dt>appid</dt><dd>The eBay application ID to use</dd>
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* </dl>
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* Each request examines the following request parameters:<dl>
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* <dt>items</dt><dd>The keyword to search for</dd>
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* </dl>
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*/
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public class AbstractRestServlet extends HttpServlet
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{
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protected final static int MAX_RESULTS = 5;
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protected final static String GOOGLE_API_KEY_NAME = "async_example_place_key";
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protected final static String GOOGLE_API_KEY = "AIzaSyABCgUB4wc290F9LcIigNXurT6yNV92yfY";
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protected final static String STYLE =
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"<style type='text/css'>"+
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" img.thumb:hover {height:50px}"+
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" img.thumb {vertical-align:text-top}"+
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" span.red {color: #ff0000}"+
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" span.green {color: #00ff00}"+
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" iframe {border: 0px}"+
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"</style>";
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protected final static String APPID_PARAM = "appid";
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protected final static String LOC_PARAM = "loc";
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protected final static String ITEMS_PARAM = "items";
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protected final static String LATITUDE_PARAM = "lat";
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protected final static String LONGITUDE_PARAM = "long";
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protected final static String RADIUS_PARAM ="radius";
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protected String _key;
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@Override
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public void init(ServletConfig servletConfig) throws ServletException
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{
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if (servletConfig.getInitParameter(APPID_PARAM) == null)
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_key = GOOGLE_API_KEY;
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else
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_key = servletConfig.getInitParameter(APPID_PARAM);
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}
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public static String sanitize(String s)
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{
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if (s==null)
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return null;
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return s.replace("<","?").replace("&","?").replace("\n","?");
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}
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protected String restQuery (String coordinates, String radius, String item)
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{
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try
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{
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return "https://maps.googleapis.com/maps/api/place/nearbysearch/json?key="+_key
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+"&location="+URLEncoder.encode(coordinates,"UTF-8")
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+"&types="+URLEncoder.encode(item,"UTF-8")
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+"&radius="+URLEncoder.encode(radius, "UTF-8");
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}
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catch (Exception e)
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{
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throw new RuntimeException(e);
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}
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}
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public String generateResults (Queue<Map<String,Object>> results)
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{
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StringBuilder thumbs = new StringBuilder();
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int resultCount = 0;
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Iterator<Map<String,Object>> itor = results.iterator();
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while (resultCount < MAX_RESULTS && itor.hasNext())
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{
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Map m = (Map)itor.next();
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String name = (String)m.get("name");
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Object[] photos = (Object[])m.get("photos");
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if (photos != null && photos.length > 0)
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{
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resultCount++;
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thumbs.append("<img class='thumb' border='1px' height='40px'"+
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" src='"+getPhotoURL((String)(((Map)photos[0]).get("photo_reference")))+"'"+
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" title='"+name+"'"+
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"/>");
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thumbs.append("</a>&nbsp;");
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}
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}
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return thumbs.toString();
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}
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public String getPhotoURL (String photoref)
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{
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return "https://maps.googleapis.com/maps/api/place/photo?key="+_key
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+"&photoreference="+photoref
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+"&maxheight=40";
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}
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protected String ms(long nano)
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{
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BigDecimal dec = new BigDecimal(nano);
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return dec.divide(new BigDecimal(1000000L)).setScale(1,RoundingMode.UP).toString();
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}
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protected int width(long nano)
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{
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int w=(int)((nano+999999L)/5000000L);
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if (w==0)
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w=2;
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return w;
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}
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protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
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{
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doGet(request, response);
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}
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}

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