From a03625dde353ce5360f99e9bfc8bf9c16d622583 Mon Sep 17 00:00:00 2001
From: Elizabeth Worstell <worstell@squareup.com>
Date: Thu, 19 Oct 2023 15:00:43 -0700
Subject: [PATCH] add ad-kotlin module in online-boutique

---
 .../services/ad-kotlin/pom.xml                | 177 ++++++++++++++++++
 .../ad-kotlin/src/main/kotlin/ftl/ad/Ad.kt    |  78 ++++++++
 2 files changed, 255 insertions(+)
 create mode 100644 examples/online-boutique/services/ad-kotlin/pom.xml
 create mode 100644 examples/online-boutique/services/ad-kotlin/src/main/kotlin/ftl/ad/Ad.kt

diff --git a/examples/online-boutique/services/ad-kotlin/pom.xml b/examples/online-boutique/services/ad-kotlin/pom.xml
new file mode 100644
index 0000000000..ba71348f13
--- /dev/null
+++ b/examples/online-boutique/services/ad-kotlin/pom.xml
@@ -0,0 +1,177 @@
+<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">
+
+    <modelVersion>4.0.0</modelVersion>
+    <groupId>xyz.block</groupId>
+    <artifactId>ad-kotlin</artifactId>
+    <version>1.0-SNAPSHOT</version>
+
+    <properties>
+        <ftl.version>1.0-SNAPSHOT</ftl.version>
+        <java.version>11</java.version>
+        <kotlin.version>1.9.0</kotlin.version>
+        <kotlin.compiler.incremental>true</kotlin.compiler.incremental>
+    </properties>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.jetbrains.kotlin</groupId>
+            <artifactId>kotlin-stdlib</artifactId>
+            <version>${kotlin.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>${project.groupId}</groupId>
+            <artifactId>ftl-runtime</artifactId>
+            <version>${ftl.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>${project.groupId}</groupId>
+            <artifactId>ftl-generator</artifactId>
+            <version>${ftl.version}</version>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <artifactId>kotlin-maven-plugin</artifactId>
+                <groupId>org.jetbrains.kotlin</groupId>
+                <version>${kotlin.version}</version>
+                <executions>
+                    <execution>
+                        <id>compile</id>
+                        <goals>
+                            <goal>compile</goal>
+                        </goals>
+                        <configuration>
+                            <sourceDirs>
+                                <sourceDir>${project.basedir}/src/main/kotlin</sourceDir>
+                            </sourceDirs>
+                        </configuration>
+                    </execution>
+                    <execution>
+                        <id>test-compile</id>
+                        <goals>
+                            <goal>test-compile</goal>
+                        </goals>
+                        <configuration>
+                            <sourceDirs>
+                                <sourceDir>${project.basedir}/src/test/kotlin</sourceDir>
+                            </sourceDirs>
+                        </configuration>
+                    </execution>
+                </executions>
+                <configuration>
+                    <compilerPlugins>
+                        <compilerPlugin>ksp</compilerPlugin>
+                    </compilerPlugins>
+                    <pluginOptions>
+                        <option>ksp:apoption=dest=${project.build.directory}</option>
+                    </pluginOptions>
+                </configuration>
+                <dependencies>
+                    <dependency>
+                        <groupId>com.dyescape</groupId>
+                        <artifactId>kotlin-maven-symbol-processing</artifactId>
+                        <version>1.6</version>
+                    </dependency>
+                    <dependency>
+                        <groupId>${project.groupId}</groupId>
+                        <artifactId>ftl-runtime</artifactId>
+                        <version>${ftl.version}</version>
+                    </dependency>
+                </dependencies>
+            </plugin>
+            <!-- Download the Wire compiler. -->
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-dependency-plugin</artifactId>
+                <version>3.2.0</version>
+                <executions>
+                    <execution>
+                        <phase>initialize</phase>
+                        <goals>
+                            <goal>copy</goal>
+                        </goals>
+                        <configuration>
+                            <artifactItems>
+                                <artifactItem>
+                                    <groupId>xyz.block</groupId>
+                                    <artifactId>ftl-generator</artifactId>
+                                    <version>${ftl.version}</version>
+                                    <classifier>jar-with-dependencies</classifier>
+                                    <destFileName>ftl-generator.jar</destFileName>
+                                </artifactItem>
+                            </artifactItems>
+                        </configuration>
+                    </execution>
+                    <execution>
+                        <id>copy-dependencies</id>
+                        <phase>compile</phase>
+                        <goals>
+                            <goal>copy-dependencies</goal>
+                        </goals>
+                        <configuration>
+                            <outputDirectory>${project.build.directory}/dependency</outputDirectory>
+                            <includeScope>runtime</includeScope>
+                        </configuration>
+                    </execution>
+                    <execution>
+                        <id>build-classpath</id>
+                        <phase>compile</phase>
+                        <goals>
+                            <goal>build-classpath</goal>
+                        </goals>
+                        <configuration>
+                            <outputFile>${project.build.directory}/classpath.txt</outputFile>
+                            <prefix>dependency</prefix>
+                        </configuration>
+                    </execution>
+                </executions>
+            </plugin>
+            <!-- Run the Wire compiler -->
+            <plugin>
+                <groupId>org.codehaus.mojo</groupId>
+                <artifactId>exec-maven-plugin</artifactId>
+                <version>3.0.0</version>
+                <executions>
+                    <execution>
+                        <phase>initialize</phase>
+                        <goals>
+                            <goal>exec</goal>
+                        </goals>
+                        <configuration>
+                            <executable>java</executable>
+                            <arguments>
+                                <argument>-jar</argument>
+                                <argument>target/dependency/ftl-generator.jar</argument>
+                                <argument>--endpoint=http://127.0.0.1:8892</argument>
+                                <argument>--dest=${project.build.directory}</argument>
+                                <argument>--module=ad</argument>
+                            </arguments>
+                        </configuration>
+                    </execution>
+                </executions>
+            </plugin>
+            <plugin>
+                <groupId>org.codehaus.mojo</groupId>
+                <artifactId>build-helper-maven-plugin</artifactId>
+                <version>3.2.0</version>
+                <executions>
+                    <execution>
+                        <phase>generate-sources</phase>
+                        <goals>
+                            <goal>add-source</goal>
+                        </goals>
+                        <configuration>
+                            <sources>
+                                <source>${project.build.directory}/generated-sources/ftl</source>
+                            </sources>
+                        </configuration>
+                    </execution>
+                </executions>
+            </plugin>
+        </plugins>
+    </build>
+</project>
\ No newline at end of file
diff --git a/examples/online-boutique/services/ad-kotlin/src/main/kotlin/ftl/ad/Ad.kt b/examples/online-boutique/services/ad-kotlin/src/main/kotlin/ftl/ad/Ad.kt
new file mode 100644
index 0000000000..ea57769fc0
--- /dev/null
+++ b/examples/online-boutique/services/ad-kotlin/src/main/kotlin/ftl/ad/Ad.kt
@@ -0,0 +1,78 @@
+package ftl.ad
+
+import com.google.gson.Gson
+import com.google.gson.annotations.SerializedName
+import com.google.gson.reflect.TypeToken
+import xyz.block.ftl.Context
+import xyz.block.ftl.Ingress
+import xyz.block.ftl.Method
+import xyz.block.ftl.Verb
+import xyz.block.ftl.serializer.makeGson
+import java.util.*
+
+data class Ad(@SerializedName("RedirectURL") val redirectUrl: String, @SerializedName("Text") val text: String)
+data class AdRequest(val contextKeys: List<String>)
+data class AdResponse(val ads: List<Ad>)
+
+class AdModule {
+  private val database: Map<String, Ad> = loadDatabase()
+
+  @Throws(Exception::class)
+  @Verb
+  @Ingress(Method.GET, "/get")
+  fun get(context: Context, req: AdRequest): AdResponse {
+    return when {
+      req.contextKeys.isNotEmpty() -> AdResponse(ads = contextualAds(req.contextKeys))
+      else -> AdResponse(ads = randomAds())
+    }
+  }
+
+  private fun contextualAds(contextKeys: List<String>): List<Ad> {
+    return contextKeys.map { database[it] ?: throw Exception("no ad registered for this context key") }
+  }
+
+  private fun randomAds(): List<Ad> {
+    val ads = mutableListOf<Ad>()
+    val random = Random()
+    repeat(MAX_ADS_TO_SERVE) {
+      ads.add(database.entries.elementAt(random.nextInt(database.size)).value)
+    }
+    return ads
+  }
+
+  companion object {
+    private const val MAX_ADS_TO_SERVE = 2
+    private const val DATABASE_JSON = "{\n" +
+      "  \"hair\": {\n" +
+      "    \"RedirectURL\": \"/product/2ZYFJ3GM2N\",\n" +
+      "    \"Text\": \"Hairdryer for sale. 50% off.\"\n" +
+      "  },\n" +
+      "  \"clothing\": {\n" +
+      "    \"RedirectURL\": \"/product/66VCHSJNUP\",\n" +
+      "    \"Text\": \"Tank top for sale. 20% off.\"\n" +
+      "  },\n" +
+      "  \"accessories\": {\n" +
+      "    \"RedirectURL\": \"/product/1YMWWN1N4O\",\n" +
+      "    \"Text\": \"Watch for sale. Buy one, get second kit for free\"\n" +
+      "  },\n" +
+      "  \"footwear\": {\n" +
+      "    \"RedirectURL\": \"/product/L9ECAV7KIM\",\n" +
+      "    \"Text\": \"Loafers for sale. Buy one, get second one for free\"\n" +
+      "  },\n" +
+      "  \"decor\": {\n" +
+      "    \"RedirectURL\": \"/product/0PUK6V6EV0\",\n" +
+      "    \"Text\": \"Candle holder for sale. 30% off.\"\n" +
+      "  },\n" +
+      "  \"kitchen\": {\n" +
+      "    \"RedirectURL\": \"/product/9SIQT8TOJO\",\n" +
+      "    \"Text\": \"Bamboo glass jar for sale. 10% off.\"\n" +
+      "  }\n" +
+      "}"
+
+    private fun loadDatabase(): Map<String, Ad> {
+      return makeGson().fromJson<Map<String, Ad>>(DATABASE_JSON)
+    }
+
+    inline fun <reified T> Gson.fromJson(json: String) = fromJson<T>(json, object : TypeToken<T>() {}.type)
+  }
+}