Implement redis cache action example

api-gateway/caching-with-redis/README.md

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+# Redis Cache
+
+This project provides an example Redis cache implementation in Knot.x.
+
+It was created with [Knot.x Starter Kit](https://github.com/Knotx/knotx-starter-kit).
+
+## Run
+Build and run docker swarm:
+
+```bash
+./gradlew build
+docker swarm init
+docker stack deploy -c redis-handler.yml redis-handler
+```
+
+## Endpoints
+
+There is one endpoint `GET /book` that calls Google Books API. It's value is cached for 20 seconds.
+
+You can check the logs with 
+
+```bash
+docker service logs redis-handler_knotx
+```
+
+Open [localhost:8092/book](http://localhost:8092/book). In the logs there should be:
+
+```
+No valid cache for key: the-book, calling the action
+New value cached under key: the-book for 20 seconds
+```
+
+After refresh the value will be retrieved from Redis and Google Books API won't be called:
+
+```
+Retrieved value from cache under key the-book
+```
+
+And after waiting 20 seconds and refreshing the Google API will be called again, because the cache will be invalidated:
+
+```
+No valid cache for key: the-book, calling the action
+New value cached under key: the-book for 20 seconds
+```
+
+[license]:https://github.com/Cognifide/knotx/blob/master/LICENSE

api-gateway/caching-with-redis/build.gradle.kts

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+/*
+ * Copyright (C) 2019 Knot.x Project
+ *
+ * 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.
+ */
+plugins {
+    id("io.knotx.distribution")
+    id("com.bmuschko.docker-remote-api")
+    id("java")
+}
+
+dependencies {
+    subprojects.forEach { "dist"(project(":${it.name}")) }
+}
+
+sourceSets.named("test") {
+    java.srcDir("functional/src/test/java")
+}
+
+allprojects {
+    group = "io.knotx"
+
+    repositories {
+        jcenter()
+        gradlePluginPortal()
+    }
+}
+
+tasks.named("build") {
+    dependsOn("runTest")
+}
+
+apply(from = "https://raw.githubusercontent.com/Knotx/knotx-starter-kit/${project.property("knotxVersion")}/gradle/docker.gradle.kts")
+apply(from = "https://raw.githubusercontent.com/Knotx/knotx-starter-kit/${project.property("knotxVersion")}/gradle/javaAndUnitTests.gradle.kts")

api-gateway/caching-with-redis/buildSrc/build.gradle.kts

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+repositories {
+    mavenLocal()
+    mavenCentral()
+    gradlePluginPortal()
+}
+dependencies {
+    implementation("com.bmuschko:gradle-docker-plugin:6.4.0")
+    implementation("io.knotx:knotx-gradle-plugins:0.1.2")
+}

api-gateway/caching-with-redis/docker/Dockerfile

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+FROM knotx/knotx:$knotx_version
+LABEL maintainer="Knot.x Project"
+
+ENV JAVA_OPTS "-agentlib:jdwp=transport=dt_socket,server=y,suspend=n,address=18092"
+
+COPY ./out/knotx /usr/local/knotx
+
+HEALTHCHECK --interval=5s --timeout=2s --retries=12 \
+  CMD curl --silent --fail localhost:8092/healthcheck || exit 1
+
+CMD [ "knotx", "run-knotx" ]

api-gateway/caching-with-redis/gradle.properties

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+version=0.0.1-SNAPSHOT
+knotxVersion=2.2.1
+knotx.version=2.2.1
+knotxConf=knotx
+knotx.conf=knotx
+docker.image.name=knotx-example/redis

api-gateway/caching-with-redis/gradle/wrapper/gradle-wrapper.properties

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+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.5.1-bin.zip
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists