1 files changed, 102 insertions, 0 deletions
diff --git a/java/com/google/gerrit/pgm/init/index/IndexModuleOnInit.java b/java/com/google/gerrit/pgm/init/index/IndexModuleOnInit.java
new file mode 100644
index 0000000000..b417d05452
--- /dev/null
+++ b/java/com/google/gerrit/pgm/init/index/IndexModuleOnInit.java
@@ -0,0 +1,102 @@
+// Copyright (C) 2017 The Android Open Source Project
+//
+// 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 com.google.gerrit.pgm.init.index;
+
+import com.google.common.collect.FluentIterable;
+import com.google.common.collect.ImmutableCollection;
+import com.google.common.collect.ImmutableList;
+import com.google.common.collect.ImmutableMap;
+import com.google.gerrit.extensions.events.LifecycleListener;
+import com.google.gerrit.index.IndexDefinition;
+import com.google.gerrit.index.SchemaDefinitions;
+import com.google.gerrit.server.account.AccountCache;
+import com.google.gerrit.server.account.GroupCache;
+import com.google.gerrit.server.index.SingleVersionModule;
+import com.google.gerrit.server.index.SingleVersionModule.SingleVersionListener;
+import com.google.gerrit.server.index.account.AccountIndexCollection;
+import com.google.gerrit.server.index.account.AccountIndexDefinition;
+import com.google.gerrit.server.index.account.AccountSchemaDefinitions;
+import com.google.gerrit.server.index.account.AllAccountsIndexer;
+import com.google.gerrit.server.index.group.AllGroupsIndexer;
+import com.google.gerrit.server.index.group.GroupIndexCollection;
+import com.google.gerrit.server.index.group.GroupIndexDefinition;
+import com.google.gerrit.server.index.group.GroupSchemaDefinitions;
+import com.google.inject.AbstractModule;
+import com.google.inject.Provides;
+import com.google.inject.ProvisionException;
+import com.google.inject.TypeLiteral;
+import com.google.inject.name.Names;
+import com.google.inject.util.Providers;
+import java.util.Collection;
+import java.util.Map;
+import java.util.Set;
+
+public class IndexModuleOnInit extends AbstractModule {
+  static final String INDEX_MANAGER = "IndexModuleOnInit/IndexManager";
+
+  private static final ImmutableCollection<SchemaDefinitions<?>> ALL_SCHEMA_DEFS =
+      ImmutableList.<SchemaDefinitions<?>>of(
+          AccountSchemaDefinitions.INSTANCE, GroupSchemaDefinitions.INSTANCE);
+
+  @Override
+  protected void configure() {
+    // The AccountIndex implementations (LuceneAccountIndex and
+    // ElasticAccountIndex) need AccountCache only for reading from the index.
+    // On init we only want to write to the index, hence we don't need the
+    // account cache.
+    bind(AccountCache.class).toProvider(Providers.of(null));
+
+    // AccountIndexDefinition wants to have AllAccountsIndexer but it is only
+    // used by the Reindex program and the OnlineReindexer which are both not
+    // used during init, hence we don't need AllAccountsIndexer.
+    bind(AllAccountsIndexer.class).toProvider(Providers.of(null));
+
+    bind(AccountIndexCollection.class);
+
+    // The GroupIndex implementations (LuceneGroupIndex and ElasticGroupIndex)
+    // need GroupCache only for reading from the index. On init we only want to
+    // write to the index, hence we don't need the group cache.
+    bind(GroupCache.class).toProvider(Providers.of(null));
+
+    // GroupIndexDefinition wants to have AllGroupsIndexer but it is only used
+    // by the Reindex program and the OnlineReindexer which are both not used
+    // during init, hence we don't need AllGroupsIndexer.
+    bind(AllGroupsIndexer.class).toProvider(Providers.of(null));
+
+    bind(GroupIndexCollection.class);
+
+    bind(new TypeLiteral<Map<String, Integer>>() {})
+        .annotatedWith(Names.named(SingleVersionModule.SINGLE_VERSIONS))
+        .toInstance(ImmutableMap.<String, Integer>of());
+    bind(LifecycleListener.class)
+        .annotatedWith(Names.named(INDEX_MANAGER))
+        .to(SingleVersionListener.class);
+  }
+
+  @Provides
+  Collection<IndexDefinition<?, ?, ?>> getIndexDefinitions(
+      AccountIndexDefinition accounts, GroupIndexDefinition groups) {
+    Collection<IndexDefinition<?, ?, ?>> result =
+        ImmutableList.<IndexDefinition<?, ?, ?>>of(accounts, groups);
+    Set<String> expected =
+        FluentIterable.from(ALL_SCHEMA_DEFS).transform(SchemaDefinitions::getName).toSet();
+    Set<String> actual = FluentIterable.from(result).transform(IndexDefinition::getName).toSet();
+    if (!expected.equals(actual)) {
+      throw new ProvisionException(
+          "need index definitions for all schemas: " + expected + " != " + actual);
+    }
+    return result;
+  }
+}