Initial spirng-session-data-geode setup.

(cherry picked from commit c5a1ee021016d37dda5e5eb96320ee1be9869314)
Signed-off-by: John Blum <jblum@pivotal.io>

samples/boot/gemfire/src/main/java/sample/server/GemFireServer.java

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+/*
+ * Copyright 2014-2016 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.server;
+
+import java.util.Properties;
+import java.util.concurrent.TimeUnit;
+
+import org.apache.geode.cache.Cache;
+
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.support.PropertySourcesPlaceholderConfigurer;
+import org.springframework.data.gemfire.CacheFactoryBean;
+import org.springframework.data.gemfire.server.CacheServerFactoryBean;
+import org.springframework.session.data.gemfire.config.annotation.web.http.EnableGemFireHttpSession;
+
+/**
+ * A Spring Boot application bootstrapping a GemFire Cache Server JVM process.
+ *
+ * @author John Blum
+ * @see org.springframework.boot.SpringApplication
+ * @see org.springframework.boot.autoconfigure.SpringBootApplication
+ * @see org.springframework.context.annotation.Bean
+ * @see org.springframework.session.data.gemfire.config.annotation.web.http.EnableGemFireHttpSession
+ * @see org.apache.geode.cache.Cache
+ * @since 1.2.1
+ */
+// tag::class[]
+@SpringBootApplication
+@EnableGemFireHttpSession(maxInactiveIntervalInSeconds = 20) // <1>
+public class GemFireServer {
+
+	static final String DEFAULT_GEMFIRE_LOG_LEVEL = "warning";
+
+	public static void main(String[] args) {
+		SpringApplication springApplication = new SpringApplication(GemFireServer.class);
+		springApplication.setWebEnvironment(false);
+		springApplication.run(args);
+	}
+
+	@Bean
+	static PropertySourcesPlaceholderConfigurer propertyPlaceholderConfigurer() {
+		return new PropertySourcesPlaceholderConfigurer();
+	}
+
+	Properties gemfireProperties() { // <2>
+		Properties gemfireProperties = new Properties();
+
+		gemfireProperties.setProperty("name", applicationName());
+		//gemfireProperties.setProperty("log-file", "gemfire-server.log");
+		gemfireProperties.setProperty("log-level", logLevel());
+		//gemfireProperties.setProperty("jmx-manager", "true");
+		//gemfireProperties.setProperty("jmx-manager-start", "true");
+
+		return gemfireProperties;
+	}
+
+	String applicationName() {
+		return "spring-session-data-gemfire-boot-sample:".concat(getClass().getSimpleName());
+	}
+
+	String logLevel() {
+		return System.getProperty("spring-session-data-gemfire.log.level", DEFAULT_GEMFIRE_LOG_LEVEL);
+	}
+
+	@Bean
+	CacheFactoryBean gemfireCache() { // <3>
+		CacheFactoryBean gemfireCache = new CacheFactoryBean();
+
+		gemfireCache.setClose(true);
+		gemfireCache.setProperties(gemfireProperties());
+
+		return gemfireCache;
+	}
+
+	@Bean
+	CacheServerFactoryBean gemfireCacheServer(Cache gemfireCache,
+			@Value("${spring-session-data-gemfire.cache.server.bind-address:localhost}") String bindAddress,
+			@Value("${spring-session-data-gemfire.cache.server.hostname-for-clients:localhost}") String hostnameForClients,
+			@Value("${spring-session-data-gemfire.cache.server.port:12480}") int port) { // <4>
+
+		CacheServerFactoryBean gemfireCacheServer = new CacheServerFactoryBean();
+
+		gemfireCacheServer.setAutoStartup(true);
+		gemfireCacheServer.setBindAddress(bindAddress);
+		gemfireCacheServer.setCache(gemfireCache);
+		gemfireCacheServer.setHostNameForClients(hostnameForClients);
+		gemfireCacheServer.setMaxTimeBetweenPings(Long.valueOf(TimeUnit.SECONDS.toMillis(60)).intValue());
+		gemfireCacheServer.setPort(port);
+
+		return gemfireCacheServer;
+	}
+}
+// end::class[]