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Add server push example
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‎servlets-4-0/pom.xml

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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<parent>
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<artifactId>Java-EE-8-Sampler</artifactId>
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<groupId>com.readlearncode</groupId>
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<version>1.0</version>
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</parent>
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<modelVersion>4.0.0</modelVersion>
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<artifactId>servlets-4-0</artifactId>
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<repositories>
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<repository>
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<id>jvnet-nexus-promoted</id>
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<name>Java.net Promoted Repositories</name>
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<url>https://maven.java.net/content/repositories/promoted/</url>
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<releases>
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<enabled>true</enabled>
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</releases>
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<snapshots>
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<enabled>false</enabled>
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</snapshots>
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</repository>
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</repositories>
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<dependencies>
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<dependency>
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<groupId>org.glassfish</groupId>
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<artifactId>javax.faces</artifactId>
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<version>2.3.2</version>
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<scope>provided</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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<version>4.0.0</version>
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<scope>provided</scope>
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</dependency>
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<dependency>
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<groupId>javax.servlet.jsp</groupId>
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<artifactId>javax.servlet.jsp-api</artifactId>
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<version>2.3.2-b02</version>
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<scope>provided</scope>
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</dependency>
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</dependencies>
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<build>
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<finalName>servlets-4-0</finalName>
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<plugins>
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<plugin>
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<groupId>org.apache.maven.plugins</groupId>
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<artifactId>maven-compiler-plugin</artifactId>
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<version>${maven-compiler-plugin.version}</version>
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<configuration>
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<source>${java.version}</source>
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<target>${java.version}</target>
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</configuration>
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</plugin>
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</plugins>
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</build>
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</project>

‎servlets-4-0/src/main/java/servlet4/hashtag100DaysOfJavaEE8/ServerPushExample.java

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package servlet4.hashtag100DaysOfJavaEE8;
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import javax.servlet.ServletException;
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import javax.servlet.annotation.WebServlet;
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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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import java.io.IOException;
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/**
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* A simple POC use of the Server Push feature.
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*
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* Source code github.com/readlearncode
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*
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* @author Alex Theedom www.readlearncode.com
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* @version 1.0
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*/
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/*
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Servlets 4.0 introduces support for HTTP/2 feature
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ServerPush. What happens when a request is made to the
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URI /duke over an insecure connection. i.e. over HTTP
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connection?
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*/
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@WebServlet("/duke")
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public class ServerPushExample extends HttpServlet {
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@Override
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protected void doGet(HttpServletRequest request,
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HttpServletResponse response)
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throws ServletException, IOException {
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request.newPushBuilder()
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.path("resources/images/java-ee-logo.png")
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.push();
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getServletContext()
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.getRequestDispatcher("/duke.jsp")
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.forward(request, response);
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}
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}
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‎servlets-4-0/src/main/java/servlet4/mapping/ServletMapping.java

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package servlet4.mapping;
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import javax.servlet.ServletException;
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import javax.servlet.annotation.WebServlet;
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import javax.servlet.http.HttpServlet;
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import javax.servlet.http.HttpServletMapping;
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import javax.servlet.http.HttpServletRequest;
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import javax.servlet.http.HttpServletResponse;
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import java.io.IOException;
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/**
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* Source code github.com/readlearncode
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*
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* @author Alex Theedom www.readlearncode.com
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* @version 1.0
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*/
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@WebServlet({"/path/*", "*.ext"})
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public class ServletMapping extends HttpServlet {
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protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
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HttpServletMapping servletMapping = request.getHttpServletMapping();
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response.getWriter()
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.append("<html><body>")
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.append("Value Matched: ").append(servletMapping.getMatchValue())
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.append("<br/>")
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.append("Pattern Used: ").append(servletMapping.getPattern())
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.append("<br/>")
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.append("Mapping Matched: ").append(servletMapping.getMappingMatch().name())
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.append("<br/>")
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.append("Servlet Name: ").append(servletMapping.getServletName())
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.append("<br/>")
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.append("</body></html>");
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}
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}

‎servlets-4-0/src/main/java/servlet4/pushbuilder/PushCacheFilter.java

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package servlet4.pushbuilder;
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import javax.servlet.FilterChain;
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import javax.servlet.ServletException;
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import javax.servlet.ServletRequest;
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import javax.servlet.ServletResponse;
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import javax.servlet.annotation.WebFilter;
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import javax.servlet.http.HttpFilter;
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import javax.servlet.http.HttpServletMapping;
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import javax.servlet.http.HttpServletRequest;
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import java.io.IOException;
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import java.util.Collections;
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import java.util.Map;
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import java.util.Set;
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import java.util.concurrent.ConcurrentHashMap;
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/**
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* A very simple and naive way to implement a push cache filter!!
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*
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* Source code github.com/readlearncode
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*
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* @author Alex Theedom www.readlearncode.com
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* @version 1.0
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*/
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@WebFilter("/PushCacheFilter")
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public class PushCacheFilter extends HttpFilter {
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private Map<String, Set<String>> resourceCache = new ConcurrentHashMap<>();
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@Override
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public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
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HttpServletRequest httpServletRequest = ((HttpServletRequest) request);
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HttpServletMapping mapping = ((HttpServletRequest) request).getHttpServletMapping();
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String resourceURI = mapping.getMatchValue();
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if (mapping.getServletName().equals("jsp")) {
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// Push resources
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resourceCache.keySet().stream()
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.filter(resourceURI::contains)
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.findFirst()
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.ifPresent(s -> resourceCache.get(s)
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.forEach(path -> httpServletRequest.newPushBuilder().path(path).push()));
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// create empty resource list if absent
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resourceCache.putIfAbsent(resourceURI, Collections.newSetFromMap(new ConcurrentHashMap<>()));
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} else {
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// Add resource
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resourceCache.keySet().stream()
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.filter(httpServletRequest.getHeader("Referer")::contains)
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.forEach(page -> resourceCache.get(page).add(resourceURI));
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}
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chain.doFilter(request, response);
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}
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}

‎servlets-4-0/src/main/java/servlet4/pushbuilder/SimplestExample.java

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package servlet4.pushbuilder;
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import javax.servlet.ServletException;
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import javax.servlet.annotation.WebServlet;
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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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import java.io.IOException;
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/**
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* A simple POC use of the Server Push feature.
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*
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* Source code github.com/readlearncode
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*
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* @author Alex Theedom www.readlearncode.com
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* @version 1.0
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*/
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@WebServlet("/duke")
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public class SimplestExample extends HttpServlet {
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@Override
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protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
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request.newPushBuilder()
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.path("resources/images/java-ee-logo.png")
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.push();
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getServletContext().getRequestDispatcher("/duke.jsp").forward(request, response);
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}
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}

‎servlets-4-0/src/main/webapp/WEB-INF/faces-config.xml

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<?xml version='1.0' encoding='UTF-8'?>
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<faces-config version="2.2"
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xmlns="http://xmlns.jcp.org/xml/ns/javaee"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-facesconfig_2_2.xsd">
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</faces-config>

‎servlets-4-0/src/main/webapp/WEB-INF/glassfish-web.xml

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<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE glassfish-web-app PUBLIC "-//GlassFish.org//DTD GlassFish Application Server 3.1 Servlet 3.0//EN"
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"http://glassfish.org/dtds/glassfish-web-app_3_0-1.dtd">
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<glassfish-web-app>
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<context-root>/Servlet4Push</context-root>
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</glassfish-web-app>

‎servlets-4-0/src/main/webapp/WEB-INF/web.xml

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<?xml version="1.0" encoding="UTF-8"?>
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<web-app version="3.1"
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xmlns="http://xmlns.jcp.org/xml/ns/javaee"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd">
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<security-constraint>
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<web-resource-collection>
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<web-resource-name>Servlet4Push</web-resource-name>
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<url-pattern>/*</url-pattern>
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<http-method>GET</http-method>
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</web-resource-collection>
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<user-data-constraint>
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<transport-guarantee>CONFIDENTIAL</transport-guarantee>
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</user-data-constraint>
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</security-constraint>
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<!--<filter>-->
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<!--<filter-name>PushCacheFilter</filter-name>-->
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<!--<filter-class>com.readlearncode.servlet4.pushbuilder.PushCacheFilter</filter-class>-->
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<!--</filter>-->
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<!--<filter-mapping>-->
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<!--<filter-name>PushCacheFilter</filter-name>-->
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<!--<url-pattern>/*</url-pattern>-->
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<!--</filter-mapping>-->
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<servlet>
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<servlet-name>Faces Servlet</servlet-name>
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<servlet-class>javax.faces.webapp.FacesServlet</servlet-class>
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<load-on-startup>1</load-on-startup>
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</servlet>
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<servlet-mapping>
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<servlet-name>Faces Servlet</servlet-name>
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<url-pattern>*.xhtml</url-pattern>
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</servlet-mapping>
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</web-app>

‎servlets-4-0/src/main/webapp/duke.jsp

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<%@ page contentType="text/html;charset=UTF-8" language="java" %>
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<html>
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<head>
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<title>Servlet 4.0 ServerPush Example</title>
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</head>
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<body>
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<img src='resources/images/java-ee-logo.png'>
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</body>
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</html>

‎servlets-4-0/src/main/webapp/duke.xhtml

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<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
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"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml"
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xmlns:h="http://java.sun.com/jsf/html">
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<h:outputStylesheet library="css" name="coffee-cup.css"/>
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<h:outputScript library="js" name="logo.js" target="head"/>
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<h:head>
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<title>JSF 2.3 ServerPush Example</title>
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</h:head>
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<h:body>
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<h:form>
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<h:graphicImage library="images" name="java-ee-logo.png"/>
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</h:form>
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</h:body>
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</html>

‎servlets-4-0/src/main/webapp/resources/css/coffee-cup.css

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‎servlets-4-0/src/main/webapp/resources/images/java-ee-logo.png

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‎servlets-4-0/src/main/webapp/resources/js/logo.js

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