SGF-42

+ add GemfireDaoSupport class

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

@@ -0,0 +1,87 @@
+/*
+ * Copyright 2011 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 org.springframework.dao.support.DaoSupport;
+import org.springframework.data.gemfire.GemfireTemplate;
+import org.springframework.util.Assert;
+
+import com.gemstone.gemfire.cache.Region;
+
+/**
+ * Convenient super class for GemFire data access objects. Intended for
+ * GemfireTemplate usage. 
+ * 
+ * <p>Requires an EntityManagerFactory or EntityManager to be set,
+ * providing a JpaTemplate based on it to subclasses. Can alternatively
+ * be initialized directly via a JpaTemplate, to reuse the latter's
+ * settings such as the EntityManagerFactory, JpaDialect, flush mode, etc.
+ *
+ * <p>This class will create its own GemfireTemplate if an EntityManagerFactory
+ * or EntityManager reference is passed in. A custom JpaTemplate instance
+ * can be used through overriding <code>createJpaTemplate</code>.
+ * 
+ * @author Costin Leau
+ */
+public class GemfireDaoSupport extends DaoSupport {
+
+	private GemfireTemplate gemfireTemplate;
+
+	/**
+	 * Sets the GemFire Region to be used by this DAO.
+	 * Will automatically create a GemfireTemplate for the given Region.
+	 *
+	 * @param region
+	 */
+	public void setRegion(Region<?, ?> region) {
+		this.gemfireTemplate = createGemfireTemplate(region);
+	}
+
+	/**
+	 * Creates a GemfireTemplate for the given Region.
+	 * <p>Can be overridden in subclasses to provide a GemfireTemplate instance
+	 * with different configuration, or a custom GemfireTemplate subclass.
+	 * @param region the GemFire Region to create a GemfireTemplate for
+	 * @return the new GemfireTemplate instance
+	 * @see #setRegion
+	 */
+	protected GemfireTemplate createGemfireTemplate(Region<?, ?> region) {
+		return new GemfireTemplate(region);
+	}
+
+	/**
+	 * Set the GemfireTemplate for this DAO explicitly,
+	 * as an alternative to specifying a GemFire {@link Region}.
+	 * @see #setRegion
+	 */
+	public final void setGemfireTemplate(GemfireTemplate gemfireTemplate) {
+		this.gemfireTemplate = gemfireTemplate;
+	}
+
+	/**
+	 * Return the GemfireTemplate for this DAO, pre-initialized
+	 * with the Region or set explicitly.
+	 */
+	public final GemfireTemplate getGemfireTemplate() {
+		return gemfireTemplate;
+	}
+
+	@Override
+	protected final void checkDaoConfig() {
+		Assert.notNull(gemfireTemplate, "region or gemfireTemplate is required");
+	}
+}

src/main/java/org/springframework/data/gemfire/support/package-info.java

@@ -0,0 +1,9 @@
+
+/**
+ *
+ * Classes supporting the <code>org.springframework.data.gemfire</code> package.
+ * Contains a DAO base class for GemfireTemplate usage.
+ *
+ */
+package org.springframework.data.gemfire.support;
+