Add cache sample

See gh-2633

spring-boot-samples/spring-boot-sample-cache/src/main/java/sample/CountryService.java

@@ -0,0 +1,38 @@
+/*
+ * Copyright 2012-2015 the original author or authors.
+ *
+ * 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 sample;
+
+import org.springframework.cache.annotation.Cacheable;
+import org.springframework.stereotype.Component;
+
+import java.util.Arrays;
+import java.util.List;
+
+/**
+ * @author Eddú Meléndez
+ * @since 1.3.0
+ */
+@Component
+public class CountryService {
+
+	@Cacheable("countries")
+	public List<String> countries() {
+		System.out.println("Loading countries");
+		return Arrays.asList("Perú", "United States");
+	}
+
+}

spring-boot-samples/spring-boot-sample-cache/src/main/java/sample/SampleEhCacheCacheApplication.java

@@ -0,0 +1,35 @@
+/*
+ * Copyright 2012-2015 the original author or authors.
+ *
+ * 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 sample;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.cache.annotation.EnableCaching;
+
+/**
+ * @author Eddú Meléndez
+ * @since 1.3.0
+ */
+@EnableCaching
+@SpringBootApplication
+public class SampleEhCacheCacheApplication {
+
+	public static void main(String[] args) {
+		SpringApplication.run(SampleEhCacheCacheApplication.class);
+	}
+
+}

spring-boot-samples/spring-boot-sample-cache/src/main/java/sample/Startup.java

@@ -0,0 +1,41 @@
+/*
+ * Copyright 2012-2015 the original author or authors.
+ *
+ * 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 sample;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.CommandLineRunner;
+import org.springframework.stereotype.Component;
+
+/**
+ * @author Eddú Meléndez
+ * @since 1.3.0
+ */
+@Component
+public class Startup implements CommandLineRunner {
+
+	@Autowired
+	private CountryService countryService;
+
+	@Override
+	public void run(String... args) throws Exception {
+		System.out.println("---- calling country service");
+		System.out.println(countryService.countries());
+		System.out.println("---- calling country service again from cache.");
+		System.out.println(countryService.countries());
+	}
+
+}