Feature/function gcp

function/function-samples/sample-function-greeter-gcp/pom.xml

@@ -22,6 +22,10 @@
     <modelVersion>4.0.0</modelVersion>
     <artifactId>sample-function-greeter-gcp</artifactId>
 
+    <properties>
+        <kotlin.version>1.5.10</kotlin.version>
+    </properties>
+
     <!--Dependencies-->
     <dependencies>
         <!--Synapse-->
@@ -31,21 +35,44 @@
         </dependency>
 
         <!--Third Party-->
+        <dependency>
+            <groupId>org.jetbrains.kotlin</groupId>
+            <artifactId>kotlin-stdlib-jdk8</artifactId>
+            <version>${kotlin.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.jetbrains.kotlin</groupId>
+            <artifactId>kotlin-test</artifactId>
+            <version>${kotlin.version}</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-validation</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.cloud</groupId>
+            <artifactId>spring-cloud-gcp-starter</artifactId>
+            <version>1.0.0.RELEASE</version>
+        </dependency>
         <dependency>
             <groupId>org.springframework.cloud</groupId>
             <artifactId>spring-cloud-starter-function-web</artifactId>
             <version>3.2.7</version>
         </dependency>
-
         <dependency>
             <groupId>org.springframework.cloud</groupId>
             <artifactId>spring-cloud-function-adapter-gcp</artifactId>
         </dependency>
-
     </dependencies>
 
     <build>
         <plugins>
+            <plugin>
+                <groupId>com.google.cloud.tools</groupId>
+                <artifactId>appengine-maven-plugin</artifactId>
+                <version>1.3.2</version>
+            </plugin>
             <plugin>
                 <groupId>org.springframework.boot</groupId>
                 <artifactId>spring-boot-maven-plugin</artifactId>
@@ -63,6 +90,50 @@
                     <port>8080</port>
                 </configuration>
             </plugin>
+            <plugin>
+                <groupId>org.jetbrains.kotlin</groupId>
+                <artifactId>kotlin-maven-plugin</artifactId>
+                <version>${kotlin.version}</version>
+                <executions>
+                    <execution>
+                        <id>compile</id>
+                        <phase>compile</phase>
+                        <goals>
+                            <goal>compile</goal>
+                        </goals>
+                    </execution>
+                    <execution>
+                        <id>test-compile</id>
+                        <phase>test-compile</phase>
+                        <goals>
+                            <goal>test-compile</goal>
+                        </goals>
+                    </execution>
+                </executions>
+                <configuration>
+                    <jvmTarget>1.8</jvmTarget>
+                </configuration>
+            </plugin>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <executions>
+                    <execution>
+                        <id>compile</id>
+                        <phase>compile</phase>
+                        <goals>
+                            <goal>compile</goal>
+                        </goals>
+                    </execution>
+                    <execution>
+                        <id>testCompile</id>
+                        <phase>test-compile</phase>
+                        <goals>
+                            <goal>testCompile</goal>
+                        </goals>
+                    </execution>
+                </executions>
+            </plugin>
         </plugins>
     </build>
 </project>

function/function-samples/sample-function-greeter-gcp/src/main/java/io/americanexpress/function/greeting/GreeterApplication.kt

@@ -0,0 +1,74 @@
+/*
+ * Copyright 2020 American Express Travel Related Services Company, 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.
+ */
+/*
+ * Copyright 2020 American Express Travel Related Services Company, 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.
+ */
+package io.americanexpress.function.greeting
+
+import org.springframework.boot.autoconfigure.SpringBootApplication
+import java.lang.StringBuilder
+import kotlin.jvm.JvmStatic
+import org.springframework.boot.SpringApplication
+import org.springframework.context.annotation.Bean
+import java.util.*
+import java.util.function.Function
+
+/**
+ * `GreeterApplication` starts the Spring Boot Application
+ */
+@SpringBootApplication
+open class GreeterApplication {
+
+    /**
+     * Uppercase function.
+     *
+     * @return the function
+     */
+    @Bean
+    open fun uppercase(): Function<String, String> {
+        return Function { value: String -> value.uppercase(Locale.getDefault()) }
+    }
+
+    /**
+     * Reverse function.
+     *
+     * @return the function
+     */
+    @Bean
+    open fun reverse(): Function<String, String> {
+        return Function { value: String? -> StringBuilder(value).reverse().toString() }
+    }
+
+    companion object {
+        /**
+         * The entry point of application.
+         *
+         * @param args the input arguments
+         */
+        @JvmStatic
+        fun main(args: Array<String>) {
+            SpringApplication.run(GreeterApplication::class.java, *args)
+        }
+    }
+}

function/function-samples/sample-function-greeter-gcp/src/main/java/io/americanexpress/function/greeting/config/GreetingConfig.kt

@@ -0,0 +1,35 @@
+/*
+ * Copyright 2020 American Express Travel Related Services Company, 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.
+ */
+package io.americanexpress.function.greeting.config
+
+import org.springframework.context.annotation.Bean
+import org.springframework.context.annotation.Configuration
+import org.springframework.validation.Validator
+import org.springframework.validation.beanvalidation.LocalValidatorFactoryBean
+
+/**
+ * `GreeterConfig` contains configurations for GreeterApplication.
+ */
+@Configuration
+open class GreetingConfig {
+    /**
+     * Instantiates Spring validator bean.
+     *
+     * @return the validator
+     */
+    @Bean
+    open fun springValidator(): Validator {
+        return LocalValidatorFactoryBean()
+    }
+}

function/function-samples/sample-function-greeter-gcp/src/main/java/io/americanexpress/function/greeting/function/Greet.kt

@@ -0,0 +1,57 @@
+/*
+ * Copyright 2020 American Express Travel Related Services Company, 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.
+ */
+package io.americanexpress.function.greeting.function
+
+import io.americanexpress.function.greeting.model.Greeting
+import org.springframework.http.HttpStatus
+import org.springframework.validation.BeanPropertyBindingResult
+import org.springframework.validation.Errors
+import org.springframework.validation.Validator
+import org.springframework.web.server.ResponseStatusException
+import java.util.function.Function
+
+/**
+ * `Greet` contains the Greet function.
+ */
+open class Greet(private val validator: Validator) : Function<Greeting, Greeting?> {
+
+    /**
+     * Applies this function to the given argument.
+     *
+     * @param greeting the function argument
+     * @return the function result
+     */
+    override fun apply(greeting: Greeting): Greeting? {
+        var output: Greeting? = null
+            val errors: Errors = BeanPropertyBindingResult(greeting, Greeting::class.java.name)
+        validator.validate(greeting, errors)
+            if (errors.allErrors.isEmpty()) {
+                output = Greeting()
+                output.message = "Hello " + greeting.message
+            } else {
+                onValidationErrors(errors)
+            }
+            return output
+    }
+
+    /**
+     * Returns new ResponseStatusException when there are validation errors.
+     *
+     * @param errors the errors
+     * @return the response status exception
+     */
+    protected fun onValidationErrors(errors: Errors): ResponseStatusException {
+        throw ResponseStatusException(HttpStatus.BAD_REQUEST, errors.allErrors[0].defaultMessage)
+    }
+}

function/function-samples/sample-function-greeter-gcp/src/main/java/io/americanexpress/function/greeting/rest/CloudFunctionMain.java → function/function-samples/sample-function-greeter-gcp/src/main/java/io/americanexpress/function/greeting/function/Greeter.kt

@@ -11,23 +11,15 @@
  * or implied. See the License for the specific language governing permissions and limitations under
  * the License.
  */
-package io.americanexpress.function.greeting.rest;
+package io.americanexpress.function.greeting.function
 
-import org.springframework.boot.SpringApplication;
-import org.springframework.boot.autoconfigure.SpringBootApplication;
-import org.springframework.context.annotation.Bean;
+import java.util.function.Function
 
-import java.util.function.Function;
-
-@SpringBootApplication
-public class CloudFunctionMain {
-
-    public static void main(String[] args) {
-        SpringApplication.run(CloudFunctionMain.class, args);
-    }
-
-    @Bean
-    public Function<String, String> uppercase() {
-        return value -> value.toUpperCase();
+/**
+ * `Greeter` contains greeter function.
+ */
+class Greeter : Function<String, String> {
+    override fun apply(s: String): String {
+        return "Hello $s, and welcome to Spring Cloud Function!!!"
     }
 }

function/function-samples/sample-function-greeter-gcp/src/main/java/io/americanexpress/function/greeting/model/Greeting.kt

@@ -0,0 +1,27 @@
+/*
+ * Copyright 2020 American Express Travel Related Services Company, 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.
+ */
+package io.americanexpress.function.greeting.model
+
+import javax.validation.constraints.NotBlank
+
+/**
+ * `Greeter` contains greeter function.
+ */
+class Greeting {
+
+    /**
+     * The message.
+     */
+    var message: @NotBlank String? = null
+}

function/function-samples/sample-function-greeter-gcp/src/main/resources/META-INF/MANIFEST.MF

@@ -1 +1 @@
-Main-Class: io.americanexpress.function.book.rest.CloudFunctionMain
+Main-Class: io.americanexpress.function.greeting.GreetingApplication

function/function-samples/sample-function-greeter-gcp/src/main/resources/application.properties

@@ -1 +1,15 @@
-spring.cloud.function.scan.packages=io.americanexpress.function.greeting.rest.function
+#/*
+#* Copyright 2020 American Express Travel Related Services Company, 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.
+#*/
+spring.cloud.function.scan.packages=io.americanexpress.function.greeting.function
+spring.cloud.function.definition=uppercase|reverse|greeter