DATACOUCH-215 - Separate SDK/SDC beans in javaconfig

This commit allows to separate creation of beans dedicated to Spring Data Couchbase from the ones that can be made more common (SDK instances) and now can be provided externally through a a strategy interface, `CouchbaseConfigurer`.

Rather than having to extend a few methods from the base Configuration
class, `CouchbaseConfigurer` represents all the components that the Spring Data integration requires.

src/integration/java/org/springframework/data/couchbase/config/AbstractCouchbaseDataConfigurationTest.java

@@ -0,0 +1,162 @@
+package org.springframework.data.couchbase.config;
+
+import static org.junit.Assert.*;
+
+import com.couchbase.client.java.Bucket;
+import com.couchbase.client.java.Cluster;
+import com.couchbase.client.java.CouchbaseCluster;
+import com.couchbase.client.java.cluster.ClusterInfo;
+import com.couchbase.client.java.document.JsonDocument;
+import com.couchbase.client.java.env.CouchbaseEnvironment;
+import com.couchbase.client.java.env.DefaultCouchbaseEnvironment;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.data.annotation.Id;
+import org.springframework.data.couchbase.repository.CouchbaseRepository;
+import org.springframework.data.couchbase.repository.config.EnableCouchbaseRepositories;
+import org.springframework.stereotype.Repository;
+import org.springframework.test.context.ContextConfiguration;
+import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
+
+/**
+ * This test case demonstrates that the {@link AbstractCouchbaseDataConfiguration} can take its SDK beans
+ * from a sibling {@link Configuration}.
+ *
+ * @author Simon Baslé
+ */
+@SuppressWarnings("SpringJavaAutowiringInspection")
+@RunWith(SpringJUnit4ClassRunner.class)
+@ContextConfiguration
+public class AbstractCouchbaseDataConfigurationTest {
+
+  @Autowired
+  ItemRepository repository;
+
+  @Autowired
+  Bucket client;
+
+  @Configuration
+  static class SdkConfig {
+
+    private static final String IP = "127.0.0.1";
+    private static final String BUCKET_NAME = "default";
+    private static final String BUCKET_PASSWORD = "";
+
+    public static Bucket bucket;
+
+    @Bean
+    public Cluster couchbaseCluster() {
+      return CouchbaseCluster.create(couchbaseEnv(), IP);
+    }
+
+    @Bean
+    public ClusterInfo couchbaseClusterInfo() {
+      return couchbaseCluster().clusterManager(BUCKET_NAME, BUCKET_PASSWORD).info();
+    }
+
+    @Bean
+    public Bucket couchbaseBucket() {
+      Bucket b = couchbaseCluster().openBucket(BUCKET_NAME, BUCKET_PASSWORD);
+      bucket = b;
+      return b;
+    }
+
+    @Bean
+    public CouchbaseEnvironment couchbaseEnv() {
+      return DefaultCouchbaseEnvironment.create();
+    }
+  }
+
+  @Configuration
+  @EnableCouchbaseRepositories(basePackageClasses = AbstractCouchbaseDataConfigurationTest.class, considerNestedRepositories = true)
+  static class Config extends AbstractCouchbaseDataConfiguration {
+
+     @Autowired
+    Cluster c;
+
+    @Autowired
+    ClusterInfo ci;
+
+    @Autowired
+    Bucket b;
+
+    @Autowired
+    CouchbaseEnvironment e;
+
+    @Override
+    protected CouchbaseConfigurer couchbaseConfigurer() {
+      return new TestCouchbaseConfigurer(e, c, ci, b);
+    }
+  }
+
+  @Test
+  public void testInjectedBucketIsFromAdditionalConfig() {
+    assertSame(client, SdkConfig.bucket);
+  }
+
+  @Test
+  public void testTemplateIsUsable() {
+    String key = "simpleConfigTest";
+    assertNotNull(repository);
+
+    Item item = new Item();
+    item.id = key;
+    item.value = "Test if the SimpleCouchbaseConfiguration can correctly get Bucket/Cluster/etc... beans injected";
+
+    repository.save(item);
+    JsonDocument testDoc = client.get(key);
+
+    assertNotNull(testDoc);
+    assertNotNull(testDoc.content());
+    assertEquals(item.value, testDoc.content().getString("value"));
+  }
+
+  private static class Item {
+    @Id
+    public String id;
+
+    public String value;
+  }
+
+  private static class TestCouchbaseConfigurer implements CouchbaseConfigurer {
+
+    private CouchbaseEnvironment env;
+    private Cluster cluster;
+    private ClusterInfo info;
+    private Bucket bucket;
+
+    public TestCouchbaseConfigurer(CouchbaseEnvironment env, Cluster cluster, ClusterInfo info, Bucket bucket) {
+      this.env = env;
+      this.cluster = cluster;
+      this.info = info;
+      this.bucket = bucket;
+    }
+
+    @Override
+    public CouchbaseEnvironment couchbaseEnvironment() throws Exception {
+      return this.env;
+    }
+
+    @Override
+    public Cluster couchbaseCluster() throws Exception {
+      return this.cluster;
+    }
+
+    @Override
+    public ClusterInfo couchbaseClusterInfo() throws Exception {
+      return this.info;
+    }
+
+    @Override
+    public Bucket couchbaseClient() throws Exception {
+      return this.bucket;
+    }
+  }
+
+  @Repository
+  interface ItemRepository extends CouchbaseRepository<Item, String> {}
+}