add an index level engine instance, allowing to provide and share data across different shard level engines

modules/elasticsearch/src/main/java/org/elasticsearch/index/engine/EngineModule.java

@@ -19,7 +19,6 @@
 
 package org.elasticsearch.index.engine;
 
-import org.elasticsearch.index.engine.robin.RobinEngineModule;
 import org.elasticsearch.util.guice.ModulesFactory;
 import org.elasticsearch.util.inject.AbstractModule;
 import org.elasticsearch.util.settings.Settings;
@@ -29,10 +28,6 @@ import org.elasticsearch.util.settings.Settings;
  */
 public class EngineModule extends AbstractModule {
 
-    public static final class EngineSettings {
-        public static final String ENGINE_TYPE = "index.engine.type";
-    }
-
     private final Settings settings;
 
     public EngineModule(Settings settings) {
@@ -40,6 +35,6 @@ public class EngineModule extends AbstractModule {
     }
 
     @Override protected void configure() {
-        ModulesFactory.createModule(settings.getAsClass(EngineSettings.ENGINE_TYPE, RobinEngineModule.class, "org.elasticsearch.index.engine.", "EngineModule"), settings).configure(binder());
+        ModulesFactory.createModule(settings.getAsClass(IndexEngineModule.EngineSettings.ENGINE_TYPE, IndexEngineModule.EngineSettings.DEFAULT_ENGINE, "org.elasticsearch.index.engine.", "EngineModule"), settings).configure(binder());
     }
 }

modules/elasticsearch/src/main/java/org/elasticsearch/index/engine/IndexEngine.java

@@ -0,0 +1,33 @@
+/*
+ * Licensed to Elastic Search and Shay Banon under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. Elastic Search licenses this
+ * file to you 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.elasticsearch.index.engine;
+
+import org.elasticsearch.index.IndexComponent;
+
+/**
+ * An "index" scoped engine that provides some meta engine for the engine, and can be used to store
+ * index level data structures that an engine requires.
+ *
+ * @author kimchy (shay.banon)
+ */
+public interface IndexEngine extends IndexComponent {
+
+    void close();
+}

modules/elasticsearch/src/main/java/org/elasticsearch/index/engine/IndexEngineModule.java

@@ -0,0 +1,50 @@
+/*
+ * Licensed to Elastic Search and Shay Banon under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. Elastic Search licenses this
+ * file to you 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.elasticsearch.index.engine;
+
+import org.elasticsearch.index.engine.robin.RobinEngineModule;
+import org.elasticsearch.index.engine.robin.RobinIndexEngineModule;
+import org.elasticsearch.util.inject.AbstractModule;
+import org.elasticsearch.util.inject.Module;
+import org.elasticsearch.util.settings.Settings;
+
+import static org.elasticsearch.util.guice.ModulesFactory.*;
+
+/**
+ * @author kimchy (shay.banon)
+ */
+public class IndexEngineModule extends AbstractModule {
+
+    public static final class EngineSettings {
+        public static final String ENGINE_TYPE = "index.engine.type";
+        public static final Class<? extends Module> DEFAULT_INDEX_ENGINE = RobinIndexEngineModule.class;
+        public static final Class<? extends Module> DEFAULT_ENGINE = RobinEngineModule.class;
+    }
+
+    private final Settings settings;
+
+    public IndexEngineModule(Settings settings) {
+        this.settings = settings;
+    }
+
+    @Override protected void configure() {
+        createModule(settings.getAsClass(EngineSettings.ENGINE_TYPE, EngineSettings.DEFAULT_INDEX_ENGINE, "org.elasticsearch.index.engine.", "IndexEngineModule"), settings).configure(binder());
+    }
+}

modules/elasticsearch/src/main/java/org/elasticsearch/index/engine/robin/RobinIndexEngine.java

@@ -0,0 +1,40 @@
+/*
+ * Licensed to Elastic Search and Shay Banon under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. Elastic Search licenses this
+ * file to you 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.elasticsearch.index.engine.robin;
+
+import org.elasticsearch.index.AbstractIndexComponent;
+import org.elasticsearch.index.Index;
+import org.elasticsearch.index.engine.IndexEngine;
+import org.elasticsearch.index.settings.IndexSettings;
+import org.elasticsearch.util.inject.Inject;
+import org.elasticsearch.util.settings.Settings;
+
+/**
+ * @author kimchy (shay.banon)
+ */
+public class RobinIndexEngine extends AbstractIndexComponent implements IndexEngine {
+
+    @Inject public RobinIndexEngine(Index index, @IndexSettings Settings indexSettings) {
+        super(index, indexSettings);
+    }
+
+    @Override public void close() {
+    }
+}

modules/elasticsearch/src/main/java/org/elasticsearch/index/engine/robin/RobinIndexEngineModule.java

@@ -0,0 +1,33 @@
+/*
+ * Licensed to Elastic Search and Shay Banon under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. Elastic Search licenses this
+ * file to you 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.elasticsearch.index.engine.robin;
+
+import org.elasticsearch.index.engine.IndexEngine;
+import org.elasticsearch.util.inject.AbstractModule;
+
+/**
+ * @author kimchy (shay.banon)
+ */
+public class RobinIndexEngineModule extends AbstractModule {
+
+    @Override protected void configure() {
+        bind(IndexEngine.class).to(RobinIndexEngine.class).asEagerSingleton();
+    }
+}

modules/elasticsearch/src/main/java/org/elasticsearch/indices/InternalIndicesService.java

@@ -28,6 +28,8 @@ import org.elasticsearch.index.analysis.AnalysisModule;
 import org.elasticsearch.index.analysis.AnalysisService;
 import org.elasticsearch.index.cache.IndexCacheModule;
 import org.elasticsearch.index.cache.filter.FilterCache;
+import org.elasticsearch.index.engine.IndexEngine;
+import org.elasticsearch.index.engine.IndexEngineModule;
 import org.elasticsearch.index.gateway.IndexGateway;
 import org.elasticsearch.index.gateway.IndexGatewayModule;
 import org.elasticsearch.index.mapper.MapperServiceModule;
@@ -174,6 +176,7 @@ public class InternalIndicesService extends AbstractLifecycleComponent<IndicesSe
         modules.add(new LocalNodeIdModule(localNodeId));
         modules.add(new IndexSettingsModule(indexSettings));
         modules.add(new IndicesPluginsModule(indexSettings, pluginsService));
+        modules.add(new IndexEngineModule(indexSettings));
         modules.add(new AnalysisModule(indexSettings));
         modules.add(new SimilarityModule(indexSettings));
         modules.add(new IndexCacheModule(indexSettings));
@@ -228,6 +231,7 @@ public class InternalIndicesService extends AbstractLifecycleComponent<IndicesSe
 
         indexInjector.getInstance(FilterCache.class).close();
         indexInjector.getInstance(AnalysisService.class).close();
+        indexInjector.getInstance(IndexEngine.class).close();
         indexInjector.getInstance(IndexServiceManagement.class).close();
 
         indexInjector.getInstance(IndexGateway.class).close(delete);