Add secondary index implementation using SolrCloud

SolrCloud can be used instead of Lucene by adding "type = SOLR"
under [index] and "url = <zookeeper-url>" under [index "solr"]
in gerrit.config.

Change-Id: I0ff8579c5e23c58b16f3605bc20eba4e80fb40fc

gerrit-pgm/src/main/java/com/google/gerrit/pgm/Reindex.java

@@ -14,9 +14,6 @@
 
 package com.google.gerrit.pgm;
 
-import static com.google.gerrit.lucene.IndexVersionCheck.SCHEMA_VERSIONS;
-import static com.google.gerrit.lucene.IndexVersionCheck.gerritIndexConfig;
-import static com.google.gerrit.lucene.LuceneChangeIndex.LUCENE_VERSION;
 import static com.google.gerrit.server.schema.DataSourceProvider.Context.MULTI_USER;
 
 import com.google.common.base.Stopwatch;
@@ -41,16 +38,19 @@ import com.google.gerrit.reviewdb.client.Project;
 import com.google.gerrit.reviewdb.server.ReviewDb;
 import com.google.gerrit.server.cache.CacheRemovalListener;
 import com.google.gerrit.server.cache.h2.DefaultCacheFactory;
-import com.google.gerrit.server.config.SitePaths;
 import com.google.gerrit.server.git.GitRepositoryManager;
 import com.google.gerrit.server.git.MultiProgressMonitor;
 import com.google.gerrit.server.git.MultiProgressMonitor.Task;
+import com.google.gerrit.server.index.ChangeIndex;
 import com.google.gerrit.server.index.ChangeIndexer;
 import com.google.gerrit.server.index.IndexExecutor;
 import com.google.gerrit.server.index.IndexModule;
+import com.google.gerrit.server.index.IndexModule.IndexType;
+import com.google.gerrit.server.index.NoIndexModule;
 import com.google.gerrit.server.patch.PatchListCacheImpl;
 import com.google.gerrit.server.patch.PatchListLoader;
 import com.google.gerrit.server.query.change.ChangeData;
+import com.google.gerrit.solr.SolrIndexModule;
 import com.google.gwtorm.server.OrmException;
 import com.google.gwtorm.server.SchemaFactory;
 import com.google.inject.AbstractModule;
@@ -61,8 +61,6 @@ import com.google.inject.Provider;
 import com.google.inject.ProvisionException;
 import com.google.inject.TypeLiteral;
 
-import org.apache.lucene.store.Directory;
-import org.apache.lucene.store.FSDirectory;
 import org.eclipse.jgit.diff.DiffEntry;
 import org.eclipse.jgit.diff.DiffFormatter;
 import org.eclipse.jgit.errors.ConfigInvalidException;
@@ -78,14 +76,11 @@ import org.eclipse.jgit.revwalk.RevCommit;
 import org.eclipse.jgit.revwalk.RevObject;
 import org.eclipse.jgit.revwalk.RevTree;
 import org.eclipse.jgit.revwalk.RevWalk;
-import org.eclipse.jgit.storage.file.FileBasedConfig;
-import org.eclipse.jgit.util.FS;
 import org.eclipse.jgit.util.io.DisabledOutputStream;
 import org.kohsuke.args4j.Option;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
-import java.io.File;
 import java.io.IOException;
 import java.io.PrintWriter;
 import java.util.Collections;
@@ -108,24 +103,24 @@ public class Reindex extends SiteProgram {
 
   private Injector dbInjector;
   private Injector sysInjector;
-  private SitePaths sitePaths;
 
   @Override
   public int run() throws Exception {
     mustHaveValidSite();
     dbInjector = createDbInjector(MULTI_USER);
-    if (!IndexModule.isEnabled(dbInjector)) {
-      throw die("Secondary index not enabled");
+    if (IndexModule.getIndexType(dbInjector) == IndexType.SQL) {
+      throw die("index.type must be configured (or not SQL)");
     }
+
     LifecycleManager dbManager = new LifecycleManager();
     dbManager.add(dbInjector);
     dbManager.start();
-    sitePaths = dbInjector.getInstance(SitePaths.class);
+
+    sysInjector = createSysInjector();
 
     // Delete before any index may be created depending on this data.
     deleteAll();
 
-    sysInjector = createSysInjector();
     LifecycleManager sysManager = new LifecycleManager();
     sysManager.add(sysInjector);
     sysManager.start();
@@ -141,7 +136,18 @@ public class Reindex extends SiteProgram {
   private Injector createSysInjector() {
     List<Module> modules = Lists.newArrayList();
     modules.add(PatchListCacheImpl.module());
-    modules.add(new LuceneIndexModule(false, threads, dryRun));
+    AbstractModule changeIndexModule;
+    switch (IndexModule.getIndexType(dbInjector)) {
+      case LUCENE:
+        changeIndexModule = new LuceneIndexModule(false, threads, dryRun);
+        break;
+      case SOLR:
+        changeIndexModule = new SolrIndexModule(false, threads);
+        break;
+      default:
+        changeIndexModule = new NoIndexModule();
+    }
+    modules.add(changeIndexModule);
     modules.add(new ReviewDbModule());
     modules.add(new AbstractModule() {
       @SuppressWarnings("rawtypes")
@@ -202,19 +208,8 @@ public class Reindex extends SiteProgram {
     if (dryRun) {
       return;
     }
-    for (String index : SCHEMA_VERSIONS.keySet()) {
-      File file = new File(sitePaths.index_dir, index);
-      if (file.exists()) {
-        Directory dir = FSDirectory.open(file);
-        try {
-          for (String name : dir.listAll()) {
-            dir.deleteFile(name);
-          }
-        } finally {
-          dir.close();
-        }
-      }
-    }
+    ChangeIndex index = sysInjector.getInstance(ChangeIndex.class);
+    index.deleteAll();
   }
 
   private int indexAll() throws Exception {
@@ -445,14 +440,7 @@ public class Reindex extends SiteProgram {
     if (dryRun) {
       return;
     }
-    FileBasedConfig cfg =
-        new FileBasedConfig(gerritIndexConfig(sitePaths), FS.detect());
-    cfg.load();
-
-    for (Map.Entry<String, Integer> e : SCHEMA_VERSIONS.entrySet()) {
-      cfg.setInt("index", e.getKey(), "schemaVersion", e.getValue());
-    }
-    cfg.setEnum("lucene", null, "version", LUCENE_VERSION);
-    cfg.save();
+    ChangeIndex index = sysInjector.getInstance(ChangeIndex.class);
+    index.finishIndex();
   }
 }