SGF-476 - Implement ServerLauncherCacheProvider to launch Geode with Spring.

Geode has removed the direct dependency on spring data gemfire in favor
of using a ServiceLoader to allow overriding the behavior of geode's server
launcher start behavior. Implementing the ServerLauncherCacheProvider
interface to allow SDG to override the server launcher behavior to parse
a spring xml file, if present.

(cherry picked from commit 4272216552d3404922a50c8cba7492b9893d1f8d)
Signed-off-by: John Blum <jblum@pivotal.io>

src/main/java/org/springframework/data/gemfire/support/SpringServerLauncherCacheProvider.java

@@ -0,0 +1,81 @@
+/*
+ * Copyright 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 org.springframework.data.gemfire.support;
+
+import java.util.Collections;
+import java.util.Properties;
+
+import com.gemstone.gemfire.cache.Cache;
+import com.gemstone.gemfire.distributed.ServerLauncher;
+import com.gemstone.gemfire.distributed.ServerLauncher.Builder;
+import com.gemstone.gemfire.distributed.internal.DistributionConfig;
+import com.gemstone.gemfire.internal.util.CollectionUtils;
+import com.gemstone.gemfire.distributed.ServerLauncherCacheProvider;
+
+/**
+ * The SpringServerLauncherCacheProvider class is overrides the default behavior
+ * of GemFire's ServerLauncher to bootstrap the cache using a Spring
+ * ApplicationContext instead of a GemFire cache.xml inside a GemFire Server
+ * JVM-based process. This enables a GemFire Cache Server resources to be
+ * configured with Spring Data GemFire's XML namespace.
+ * 
+ * Unlike {@link SpringContextBootstrappingInitializer}, this allows the configuration
+ * of the cache to specified in the Spring Context.
+ * 
+ * To use this cache provider, ensure that the spring data gemfire jars are on 
+ * the classpath of the GemFire server and specify the --spring-xml-location 
+ * option from the command line or call {@link Builder#setSpringXmlLocation(String)} 
+ * when launching the GemFire server.
+ *
+ * @author Dan Smith
+ * @see ServerLauncherCacheProvider
+ * @see SpringContextBootstrappingInitializer
+ * @see org.springframework.context.ApplicationContext
+ * @see org.springframework.context.ApplicationListener
+ * @see org.springframework.context.ConfigurableApplicationContext
+ * @see org.springframework.context.annotation.
+ *      AnnotationConfigApplicationContext
+ * @see org.springframework.context.event.ApplicationContextEvent
+ * @see org.springframework.context.event.ApplicationEventMulticaster
+ * @see org.springframework.context.support.ClassPathXmlApplicationContext
+ * @see com.gemstone.gemfire.cache.Declarable
+ * @link http://gemfire.docs.pivotal.io/latest/userguide/index.html#basic_config
+ *       /the_cache/setting_cache_initializer.html
+ */
+public class SpringServerLauncherCacheProvider implements ServerLauncherCacheProvider {
+
+	@Override
+	public Cache createCache(Properties gemfireProperties, ServerLauncher serverLauncher) {
+		if (!serverLauncher.isSpringXmlLocationSpecified()) {
+			return null;
+		}
+
+		System.setProperty(DistributionConfig.GEMFIRE_PREFIX + DistributionConfig.NAME_NAME,
+				serverLauncher.getMemberName());
+
+		createSpringContextBootstrappingInitializer().init(CollectionUtils.createProperties(
+				Collections.singletonMap(SpringContextBootstrappingInitializer.CONTEXT_CONFIG_LOCATIONS_PARAMETER,
+						serverLauncher.getSpringXmlLocation())));
+
+		return SpringContextBootstrappingInitializer.getApplicationContext().getBean(Cache.class);
+	}
+
+	/* Used for testing purposes */
+	protected SpringContextBootstrappingInitializer createSpringContextBootstrappingInitializer() {
+		return new SpringContextBootstrappingInitializer();
+	}
+
+}