Caching HTTP session data using JCache and Hazelcast

12package io.openliberty.guides.cart;
13
14import jakarta.ws.rs.ApplicationPath;
15import jakarta.ws.rs.core.Application;
16
17@ApplicationPath("/")
18public class CartApplication extends Application {
19
20}21

 12package io.openliberty.guides.cart;
 13
 14import java.util.Enumeration;
 15
 16import jakarta.json.Json;
 17import jakarta.json.JsonArrayBuilder;
 18import jakarta.json.JsonObject;
 19import jakarta.json.JsonObjectBuilder;
 20import jakarta.servlet.http.HttpServletRequest;
 21import jakarta.servlet.http.HttpSession;
 22import jakarta.ws.rs.GET;
 23import jakarta.ws.rs.POST;
 24import jakarta.ws.rs.Path;
 25import jakarta.ws.rs.PathParam;
 26import jakarta.ws.rs.Produces;
 27import jakarta.ws.rs.core.Context;
 28import jakarta.ws.rs.core.MediaType;
 29
 30import org.eclipse.microprofile.openapi.annotations.Operation;
 31import org.eclipse.microprofile.openapi.annotations.parameters.Parameter;
 32import org.eclipse.microprofile.openapi.annotations.responses.APIResponse;
 33
 34@Path("/")
 35public class CartResource {
 36
 37    @POST
 39    @Path("cart/{item}&{price}")
 41    @Produces(MediaType.TEXT_PLAIN)
 42    @APIResponse(responseCode = "200", description = "Item successfully added to cart.")
 43    @Operation(summary = "Add a new item to cart.")
 45    public String addToCart(@Context HttpServletRequest request,
 46                    @Parameter(description = "Item you need for intergalatic travel.",
 47                               required = true)
 49                    @PathParam("item") String item,
 51                    @Parameter(description = "Price for this item.",
 52                               required = true)
 54                    @PathParam("price") double price) {
 57        HttpSession session = request.getSession();
 60        session.setAttribute(item, price);
 62        return item + " added to your cart and costs $" + price;
 63    }
 65
 66    @GET
 68    @Path("cart")
 70    @Produces(MediaType.APPLICATION_JSON)
 71    @APIResponse(responseCode = "200",
 72        description = "Items successfully retrieved from your cart.")
 73    @Operation(summary = "Return an JsonObject instance which contains "
 74                        + "the items in your cart and the subtotal.")
 76    public JsonObject getCart(@Context HttpServletRequest request) {
 77        HttpSession session = request.getSession();
 78        Enumeration<String> names = session.getAttributeNames();
 79        JsonObjectBuilder builder = Json.createObjectBuilder();
 81        builder.add("pod-name", getHostname());
 84        builder.add("session-id", session.getId());
 86        JsonArrayBuilder arrayBuilder = Json.createArrayBuilder();
 87        Double subtotal = 0.0;
 88        while (names.hasMoreElements()) {
 89            String name = names.nextElement();
 90            String price = session.getAttribute(name).toString();
 91            arrayBuilder.add(name + " | $" + price);
 92            subtotal += Double.valueOf(price).doubleValue();
 93        }
 95        builder.add("cart", arrayBuilder);
 97        builder.add("subtotal", subtotal);
 98        return builder.build();
 99    }
101
102    private String getHostname() {
103        String hostname = System.getenv("HOSTNAME");
104        if (hostname == null) {
105            hostname = "localhost";
106        }
107        return hostname;
108    }
109}110

12<server description="Liberty Server for Sessions Management">
13
14    <featureManager>
15        <platform>jakartaee-10.0</platform>
16        <platform>microprofile-7.0</platform>
17        <feature>servlet</feature>
18        <feature>restfulWS</feature>
19        <feature>jsonb</feature>
20        <feature>jsonp</feature>
21        <feature>mpOpenAPI</feature>
23        <feature>sessionCache-1.0</feature>
25    </featureManager>
26
27    <variable name="http.port" defaultValue="9090"/>
28    <variable name="https.port" defaultValue="9453"/>
29    <variable name="app.context.root" defaultValue="guide-sessions"/>
30
31    <httpEndpoint httpPort="${http.port}" httpsPort="${https.port}"
32        id="defaultHttpEndpoint" host="*" />
34    <httpSessionCache libraryRef="jCacheVendorLib"
35        uri="file:${server.config.dir}/hazelcast-config.xml" />
38    <library id="jCacheVendorLib">
40        <file name="${shared.resource.dir}/hazelcast-5.3.6.jar" />
42    </library>
44
45    <webApplication location="guide-sessions.war" contextRoot="${app.context.root}" />
46
47</server>48

  1<?xml version="1.0" encoding="UTF-8"?><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/xsd/maven-4.0.0.xsd">
  2    <modelVersion>4.0.0</modelVersion>
  3    
  4    <groupId>io.openliberty.guides</groupId>
  5    <artifactId>guide-sessions</artifactId>
  6    <version>1.0-SNAPSHOT</version>
  7    <packaging>war</packaging>
  8
  9    <properties>
 10        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
 11        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
 12        <maven.compiler.source>11</maven.compiler.source>
 13        <maven.compiler.target>11</maven.compiler.target>
 14        <!-- Liberty configuration -->
 15        <hazelcast.path>${user.home}/.m2/repository/com/hazelcast/hazelcast/</hazelcast.path>
 16        <liberty.var.http.port>9090</liberty.var.http.port>
 17        <liberty.var.https.port>9453</liberty.var.https.port>
 18        <liberty.var.app.context.root>${project.artifactId}</liberty.var.app.context.root>
 19    </properties>
 20
 21    <dependencies>
 22        <!-- Provided dependencies -->
 23        <dependency>
 24            <groupId>jakarta.platform</groupId>
 25            <artifactId>jakarta.jakartaee-api</artifactId>
 26            <version>10.0.0</version>
 27            <scope>provided</scope>
 28        </dependency>
 29        <dependency>
 30            <groupId>org.eclipse.microprofile</groupId>
 31            <artifactId>microprofile</artifactId>
 32            <version>7.0</version>
 33            <type>pom</type>
 34            <scope>provided</scope>
 35        </dependency>
 36        
 37        <!-- Hazelcast Dependency -->
 38        <dependency>
 39            <groupId>com.hazelcast</groupId>
 40            <artifactId>hazelcast</artifactId>
 41            <version>5.5.0</version>
 42            <scope>test</scope>
 43        </dependency>
 44        
 45        <!-- For tests -->
 46        <dependency>
 47            <groupId>org.junit.jupiter</groupId>
 48            <artifactId>junit-jupiter</artifactId>
 49            <version>5.12.0</version>
 50            <scope>test</scope>
 51        </dependency>
 52        <dependency>
 53            <groupId>org.jboss.resteasy</groupId>
 54            <artifactId>resteasy-client</artifactId>
 55            <version>6.2.11.Final</version>
 56            <scope>test</scope>
 57        </dependency>
 58        <dependency>
 59            <groupId>org.jboss.resteasy</groupId>
 60            <artifactId>resteasy-json-binding-provider</artifactId>
 61            <version>6.2.11.Final</version>
 62            <scope>test</scope>
 63        </dependency>
 64        <dependency>
 65            <groupId>org.glassfish</groupId>
 66            <artifactId>jakarta.json</artifactId>
 67            <version>2.0.1</version>
 68            <scope>test</scope>
 69        </dependency>
 70    </dependencies>
 71
 72    <build>
 73        <finalName>${project.artifactId}</finalName>
 74        <plugins>
 75            <plugin>
 76                <groupId>org.apache.maven.plugins</groupId>
 77                <artifactId>maven-war-plugin</artifactId>
 78                <version>3.4.0</version>
 79            </plugin>
 80            
 81            <!-- Enable Liberty Maven plugin -->
 82            <plugin>
 83                <groupId>io.openliberty.tools</groupId>
 84                <artifactId>liberty-maven-plugin</artifactId>
 85                <version>3.11.2</version>
 87                <configuration>
 88                    <!-- Copy the hazelcast library -->
 89                    <copyDependencies>
 90                        <dependencyGroup>
 91                            <location>${project.build.directory}/liberty/wlp/usr/shared/resources</location>
 92                            <dependency>
 93                                <groupId>com.hazelcast</groupId>
 94                                <artifactId>hazelcast</artifactId>
 95                                <version>5.3.6</version>
 96                            </dependency>
 97                        </dependencyGroup>
 98                    </copyDependencies>
 99                </configuration>
101            </plugin>
102            
103            <!-- Plugin to run unit tests -->
104            <plugin>
105                <groupId>org.apache.maven.plugins</groupId>
106                <artifactId>maven-surefire-plugin</artifactId>
107                <version>3.5.2</version>
108            </plugin>
109            
110            <!-- Plugin to run functional tests -->
111            <plugin>
112                <groupId>org.apache.maven.plugins</groupId>
113                <artifactId>maven-failsafe-plugin</artifactId>
114                <version>3.5.2</version>
115                <configuration>
116                    <systemPropertyVariables>
117                        <http.port>${liberty.var.http.port}</http.port>
118                    </systemPropertyVariables>
119                </configuration>
120            </plugin>
121        </plugins>
122    </build>
123</project>124

12<server description="Liberty Server for Sessions Management">
13
14    <featureManager>
15        <platform>jakartaee-10.0</platform>
16        <platform>microprofile-7.0</platform>
17        <feature>servlet</feature>
18        <feature>restfulWS</feature>
19        <feature>jsonb</feature>
20        <feature>jsonp</feature>
21        <feature>mpOpenAPI</feature>
23        <feature>sessionCache-1.0</feature>
25    </featureManager>
26
27    <variable name="http.port" defaultValue="9090"/>
28    <variable name="https.port" defaultValue="9453"/>
29    <variable name="app.context.root" defaultValue="guide-sessions"/>
30
31    <httpEndpoint httpPort="${http.port}" httpsPort="${https.port}"
32        id="defaultHttpEndpoint" host="*" />
34    <httpSessionCache libraryRef="jCacheVendorLib"
35        uri="file:${server.config.dir}/hazelcast-config.xml" />
38    <library id="jCacheVendorLib">
40        <file name="${shared.resource.dir}/hazelcast-5.3.6.jar" />
42    </library>
44
45    <webApplication location="guide-sessions.war" contextRoot="${app.context.root}" />
46
47</server>48

12<hazelcast xmlns="http://www.hazelcast.com/schema/config"
13    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
14    xsi:schemaLocation="http://www.hazelcast.com/schema/config
15       https://hazelcast.com/schema/config/hazelcast-config-5.3.xsd">
16
18    <cluster-name>CartCluster</cluster-name>
20
22    <network>
23        <join>
25           <multicast enabled="true"/>
27        </join>
28    </network>
30
31</hazelcast>32