Add CalculatorController Spring Web MVC component exposing a REST API for the Calculator application.

spring-geode-samples/caching/inline/src/main/java/example/app/caching/inline/controller/CalculatorController.java

@@ -0,0 +1,77 @@
+/*
+ * Copyright 2019 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
+ *
+ *     https://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 example.app.caching.inline.controller;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.RestController;
+
+import example.app.caching.inline.model.ResultHolder;
+import example.app.caching.inline.service.CalculatorService;
+
+/**
+ * The CalculatorController class...
+ *
+ * @author John Blum
+ * @since 1.0.0
+ */
+// tag::class[]
+@RestController
+public class CalculatorController {
+
+	@Autowired
+	private CalculatorService calculatorService;
+
+	@GetMapping("/")
+	public String home() {
+		return ping();
+	}
+
+	@GetMapping("/ping")
+	public String ping() {
+		return format("PONG");
+	}
+
+	@GetMapping("/calculator/factorial/{number}")
+	public String factorial(@PathVariable("number") int number) {
+
+		long t0 = System.currentTimeMillis();
+
+		ResultHolder result = this.calculatorService.factorial(number);
+
+		return toJson(result, System.currentTimeMillis() - t0, this.calculatorService.isCacheMiss());
+	}
+
+	@GetMapping("/calculator/sqrt/{number}")
+	public String sqrt(@PathVariable("number") int number) {
+
+		long t0 = System.currentTimeMillis();
+
+		ResultHolder result = this.calculatorService.sqrt(number);
+
+		return toJson(result, System.currentTimeMillis() - t0, this.calculatorService.isCacheMiss());
+	}
+
+	private String format(Object output) {
+		return String.format("<h1>%s</h1>", output);
+	}
+
+	private String toJson(ResultHolder result, long latency, boolean cacheMiss) {
+		return format(String.format("{ math: %s, latency: %d ms, cacheMiss: %s }", result, latency, cacheMiss));
+	}
+}
+// end::class[]