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   * Licensed to the Apache Software Foundation (ASF) under one
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   * distributed with this work for additional information
   * regarding copyright ownership.  The ASF 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
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  package org.apache.cassandra.schema;
  
  import com.google.common.collect.MapDifference;
  
  import org.apache.cassandra.diag.DiagnosticEventService;
  import org.apache.cassandra.schema.SchemaEvent.SchemaEventType;
  
  // TODO: re-wire schema diagnostics events
  public final class SchemaDiagnostics
  {
      private static final DiagnosticEventService service = DiagnosticEventService.instance();
  
      private SchemaDiagnostics()
      {
      }
  
      static void metadataInitialized(SchemaProvider schema, KeyspaceMetadata ksmUpdate)
      {
          if (isEnabled(SchemaEventType.KS_METADATA_LOADED))
              service.publish(new SchemaEvent(SchemaEventType.KS_METADATA_LOADED, schema, ksmUpdate, null, null, null, null, null, null));
      }
  
      static void metadataReloaded(SchemaProvider schema, KeyspaceMetadata previous, KeyspaceMetadata ksmUpdate, Tables.TablesDiff tablesDiff, Views.ViewsDiff viewsDiff, MapDifference<String,TableMetadata> indexesDiff)
      {
          if (isEnabled(SchemaEventType.KS_METADATA_RELOADED))
              service.publish(new SchemaEvent(SchemaEventType.KS_METADATA_RELOADED, schema, ksmUpdate, previous,
                                              null, null, tablesDiff, viewsDiff, indexesDiff));
      }
  
      static void metadataRemoved(SchemaProvider schema, KeyspaceMetadata ksmUpdate)
      {
          if (isEnabled(SchemaEventType.KS_METADATA_REMOVED))
              service.publish(new SchemaEvent(SchemaEventType.KS_METADATA_REMOVED, schema, ksmUpdate,
                                              null, null, null, null, null, null));
      }
  
      public static void versionUpdated(SchemaProvider schema)
      {
          if (isEnabled(SchemaEventType.VERSION_UPDATED))
              service.publish(new SchemaEvent(SchemaEventType.VERSION_UPDATED, schema,
                                              null, null, null, null, null, null, null));
      }
  
      static void keyspaceCreating(SchemaProvider schema, KeyspaceMetadata keyspace)
      {
          if (isEnabled(SchemaEventType.KS_CREATING))
              service.publish(new SchemaEvent(SchemaEventType.KS_CREATING, schema, keyspace,
                                              null, null, null, null, null, null));
      }
  
      static void keyspaceCreated(SchemaProvider schema, KeyspaceMetadata keyspace)
      {
          if (isEnabled(SchemaEventType.KS_CREATED))
              service.publish(new SchemaEvent(SchemaEventType.KS_CREATED, schema, keyspace,
                                              null, null, null, null, null, null));
      }
  
      static void keyspaceAltering(SchemaProvider schema, KeyspaceMetadata.KeyspaceDiff delta)
      {
          if (isEnabled(SchemaEventType.KS_ALTERING))
              service.publish(new SchemaEvent(SchemaEventType.KS_ALTERING, schema, delta.after,
                                              delta.before, delta, null, null, null, null));
      }
  
      static void keyspaceAltered(SchemaProvider schema, KeyspaceMetadata.KeyspaceDiff delta)
      {
          if (isEnabled(SchemaEventType.KS_ALTERED))
              service.publish(new SchemaEvent(SchemaEventType.KS_ALTERED, schema, delta.after,
                                              delta.before, delta, null, null, null, null));
      }
  
      static void keyspaceDropping(SchemaProvider schema, KeyspaceMetadata keyspace)
      {
          if (isEnabled(SchemaEventType.KS_DROPPING))
              service.publish(new SchemaEvent(SchemaEventType.KS_DROPPING, schema, keyspace,
                                              null, null, null, null, null, null));
      }
  
      static void keyspaceDropped(SchemaProvider schema, KeyspaceMetadata keyspace)
      {
          if (isEnabled(SchemaEventType.KS_DROPPED))
              service.publish(new SchemaEvent(SchemaEventType.KS_DROPPED, schema, keyspace,
                                              null, null, null, null, null, null));
      }
  
      static void schemaLoading(SchemaProvider schema)
      {
          if (isEnabled(SchemaEventType.SCHEMATA_LOADING))
              service.publish(new SchemaEvent(SchemaEventType.SCHEMATA_LOADING, schema, null,
                                              null, null, null, null, null, null));
      }
  
      // Looks like the author of the patch has meant "schemas" or "schemata", plural. So unless we rename "schemata" everywhere, i'd just leave it as-is
      static void schemaLoaded(SchemaProvider schema)
      {
          if (isEnabled(SchemaEventType.SCHEMATA_LOADED))
              service.publish(new SchemaEvent(SchemaEventType.SCHEMATA_LOADED, schema, null,
                                              null, null, null, null, null, null));
      }
  
      static void versionAnnounced(SchemaProvider schema)
      {
          if (isEnabled(SchemaEventType.VERSION_ANOUNCED))
              service.publish(new SchemaEvent(SchemaEventType.VERSION_ANOUNCED, schema, null,
                                              null, null, null, null, null, null));
      }
  
      static void schemaCleared(SchemaProvider schema)
      {
          if (isEnabled(SchemaEventType.SCHEMATA_CLEARED))
              service.publish(new SchemaEvent(SchemaEventType.SCHEMATA_CLEARED, schema, null,
                                              null, null, null, null, null, null));
      }
  
      static void tableCreating(SchemaProvider schema, TableMetadata table)
      {
          if (isEnabled(SchemaEventType.TABLE_CREATING))
              service.publish(new SchemaEvent(SchemaEventType.TABLE_CREATING, schema, null,
                                              null, null, table, null, null, null));
      }
  
      static void tableCreated(SchemaProvider schema, TableMetadata table)
      {
          if (isEnabled(SchemaEventType.TABLE_CREATED))
              service.publish(new SchemaEvent(SchemaEventType.TABLE_CREATED, schema, null,
                                              null, null, table, null, null, null));
      }
  
      static void tableAltering(SchemaProvider schema, TableMetadata table)
      {
          if (isEnabled(SchemaEventType.TABLE_ALTERING))
              service.publish(new SchemaEvent(SchemaEventType.TABLE_ALTERING, schema, null,
                                              null, null, table, null, null, null));
      }
  
      static void tableAltered(SchemaProvider schema, TableMetadata table)
      {
          if (isEnabled(SchemaEventType.TABLE_ALTERED))
              service.publish(new SchemaEvent(SchemaEventType.TABLE_ALTERED, schema, null,
                                              null, null, table, null, null, null));
      }
  
      static void tableDropping(SchemaProvider schema, TableMetadata table)
      {
          if (isEnabled(SchemaEventType.TABLE_DROPPING))
              service.publish(new SchemaEvent(SchemaEventType.TABLE_DROPPING, schema, null,
                                              null, null, table, null, null, null));
      }
  
      static void tableDropped(SchemaProvider schema, TableMetadata table)
      {
          if (isEnabled(SchemaEventType.TABLE_DROPPED))
              service.publish(new SchemaEvent(SchemaEventType.TABLE_DROPPED, schema, null,
                                              null, null, table, null, null, null));
      }
  
      private static boolean isEnabled(SchemaEventType type)
      {
          return service.isEnabled(SchemaEvent.class, type);
      }
  
  }
  