/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * 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
 * limitations under the License.
 */
package org.apache.hadoop.hbase.master;

import com.google.protobuf.Service;

import java.io.IOException;
import java.util.List;

import org.apache.hadoop.hbase.Server;
import org.apache.hadoop.hbase.ServerName;
import org.apache.hadoop.hbase.TableDescriptors;
import org.apache.hadoop.hbase.TableName;
import org.apache.hadoop.hbase.TableNotDisabledException;
import org.apache.hadoop.hbase.TableNotFoundException;
import org.apache.hadoop.hbase.client.ColumnFamilyDescriptor;
import org.apache.hadoop.hbase.client.MasterSwitchType;
import org.apache.hadoop.hbase.client.RegionInfo;
import org.apache.hadoop.hbase.client.TableDescriptor;
import org.apache.hadoop.hbase.executor.ExecutorService;
import org.apache.hadoop.hbase.favored.FavoredNodesManager;
import org.apache.hadoop.hbase.master.assignment.AssignmentManager;
import org.apache.hadoop.hbase.master.locking.LockManager;
import org.apache.hadoop.hbase.master.normalizer.RegionNormalizer;
import org.apache.hadoop.hbase.master.procedure.MasterProcedureEnv;
import org.apache.hadoop.hbase.master.replication.ReplicationPeerManager;
import org.apache.hadoop.hbase.master.snapshot.SnapshotManager;
import org.apache.hadoop.hbase.procedure.MasterProcedureManagerHost;
import org.apache.hadoop.hbase.procedure2.LockedResource;
import org.apache.hadoop.hbase.procedure2.Procedure;
import org.apache.hadoop.hbase.procedure2.ProcedureEvent;
import org.apache.hadoop.hbase.procedure2.ProcedureExecutor;
import org.apache.hadoop.hbase.quotas.MasterQuotaManager;
import org.apache.hadoop.hbase.replication.ReplicationException;
import org.apache.hadoop.hbase.replication.ReplicationPeerConfig;
import org.apache.hadoop.hbase.replication.ReplicationPeerDescription;
import org.apache.yetus.audience.InterfaceAudience;

import org.apache.hbase.thirdparty.com.google.common.annotations.VisibleForTesting;

/**
 * A curated subset of services provided by {@link HMaster}.
 * For use internally only. Passed to Managers, Services and Chores so can pass less-than-a
 * full-on HMaster at test-time. Be judicious adding API. Changes cause ripples through
 * the code base.
 */
@InterfaceAudience.Private
public interface MasterServices extends Server {
  /**
   * @return the underlying snapshot manager
   */
  SnapshotManager getSnapshotManager();

  /**
   * @return the underlying MasterProcedureManagerHost
   */
  MasterProcedureManagerHost getMasterProcedureManagerHost();

  /**
   * @return Master's instance of {@link ClusterSchema}
   */
  ClusterSchema getClusterSchema();

  /**
   * @return Master's instance of the {@link AssignmentManager}
   */
  AssignmentManager getAssignmentManager();

  /**
   * @return Master's filesystem {@link MasterFileSystem} utility class.
   */
  MasterFileSystem getMasterFileSystem();

  /**
   * @return Master's WALs {@link MasterWalManager} utility class.
   */
  MasterWalManager getMasterWalManager();

  /**
   * @return Master's {@link ServerManager} instance.
   */
  ServerManager getServerManager();

  /**
   * @return Master's instance of {@link ExecutorService}
   */
  ExecutorService getExecutorService();

  /**
   * @return Master's instance of {@link TableStateManager}
   */
  TableStateManager getTableStateManager();

  /**
   * @return Master's instance of {@link MasterCoprocessorHost}
   */
  MasterCoprocessorHost getMasterCoprocessorHost();

  /**
   * @return Master's instance of {@link MasterQuotaManager}
   */
  MasterQuotaManager getMasterQuotaManager();

  /**
   * @return Master's instance of {@link RegionNormalizer}
   */
  RegionNormalizer getRegionNormalizer();

  /**
   * @return Master's instance of {@link CatalogJanitor}
   */
  CatalogJanitor getCatalogJanitor();

  /**
   * @return Master's instance of {@link ProcedureExecutor}
   */
  ProcedureExecutor<MasterProcedureEnv> getMasterProcedureExecutor();

  /**
   * @return Tripped when Master has finished initialization.
   */
  @VisibleForTesting
  public ProcedureEvent<?> getInitializedEvent();

  /**
   * @return Master's instance of {@link MetricsMaster}
   */
  MetricsMaster getMasterMetrics();

  /**
   * Check table is modifiable; i.e. exists and is offline.
   * @param tableName Name of table to check.
   * @throws TableNotDisabledException
   * @throws TableNotFoundException
   * @throws IOException
   */
  // We actually throw the exceptions mentioned in the
  void checkTableModifiable(final TableName tableName)
      throws IOException, TableNotFoundException, TableNotDisabledException;

  /**
   * Create a table using the given table definition.
   * @param desc The table definition
   * @param splitKeys Starting row keys for the initial table regions.  If null
   * @param nonceGroup
   * @param nonce
   *     a single region is created.
   */
  long createTable(
      final TableDescriptor desc,
      final byte[][] splitKeys,
      final long nonceGroup,
      final long nonce) throws IOException;

  /**
   * Create a system table using the given table definition.
   * @param tableDescriptor The system table definition
   *     a single region is created.
   */
  long createSystemTable(final TableDescriptor tableDescriptor) throws IOException;

  /**
   * Delete a table
   * @param tableName The table name
   * @param nonceGroup
   * @param nonce
   * @throws IOException
   */
  long deleteTable(
      final TableName tableName,
      final long nonceGroup,
      final long nonce) throws IOException;

  /**
   * Truncate a table
   * @param tableName The table name
   * @param preserveSplits True if the splits should be preserved
   * @param nonceGroup
   * @param nonce
   * @throws IOException
   */
  public long truncateTable(
      final TableName tableName,
      final boolean preserveSplits,
      final long nonceGroup,
      final long nonce) throws IOException;

  /**
   * Modify the descriptor of an existing table
   * @param tableName The table name
   * @param descriptor The updated table descriptor
   * @param nonceGroup
   * @param nonce
   * @throws IOException
   */
  long modifyTable(
      final TableName tableName,
      final TableDescriptor descriptor,
      final long nonceGroup,
      final long nonce)
      throws IOException;

  /**
   * Enable an existing table
   * @param tableName The table name
   * @param nonceGroup
   * @param nonce
   * @throws IOException
   */
  long enableTable(
      final TableName tableName,
      final long nonceGroup,
      final long nonce) throws IOException;

  /**
   * Disable an existing table
   * @param tableName The table name
   * @param nonceGroup
   * @param nonce
   * @throws IOException
   */
  long disableTable(
      final TableName tableName,
      final long nonceGroup,
      final long nonce) throws IOException;


  /**
   * Add a new column to an existing table
   * @param tableName The table name
   * @param column The column definition
   * @param nonceGroup
   * @param nonce
   * @throws IOException
   */
  long addColumn(
      final TableName tableName,
      final ColumnFamilyDescriptor column,
      final long nonceGroup,
      final long nonce)
      throws IOException;

  /**
   * Modify the column descriptor of an existing column in an existing table
   * @param tableName The table name
   * @param descriptor The updated column definition
   * @param nonceGroup
   * @param nonce
   * @throws IOException
   */
  long modifyColumn(
      final TableName tableName,
      final ColumnFamilyDescriptor descriptor,
      final long nonceGroup,
      final long nonce)
      throws IOException;

  /**
   * Delete a column from an existing table
   * @param tableName The table name
   * @param columnName The column name
   * @param nonceGroup
   * @param nonce
   * @throws IOException
   */
  long deleteColumn(
      final TableName tableName,
      final byte[] columnName,
      final long nonceGroup,
      final long nonce)
      throws IOException;

  /**
   * Merge regions in a table.
   * @param regionsToMerge daughter regions to merge
   * @param forcible whether to force to merge even two regions are not adjacent
   * @param nonceGroup used to detect duplicate
   * @param nonce used to detect duplicate
   * @return  procedure Id
   * @throws IOException
   */
  long mergeRegions(
      final RegionInfo[] regionsToMerge,
      final boolean forcible,
      final long nonceGroup,
      final long nonce) throws IOException;

  /**
   * Split a region.
   * @param regionInfo region to split
   * @param splitRow split point
   * @param nonceGroup used to detect duplicate
   * @param nonce used to detect duplicate
   * @return  procedure Id
   * @throws IOException
   */
  long splitRegion(
      final RegionInfo regionInfo,
      final byte [] splitRow,
      final long nonceGroup,
      final long nonce) throws IOException;

  /**
   * @return Return table descriptors implementation.
   */
  TableDescriptors getTableDescriptors();

  /**
   * Registers a new protocol buffer {@link Service} subclass as a master coprocessor endpoint.
   *
   * <p>
   * Only a single instance may be registered for a given {@link Service} subclass (the
   * instances are keyed on {@link com.google.protobuf.Descriptors.ServiceDescriptor#getFullName()}.
   * After the first registration, subsequent calls with the same service name will fail with
   * a return value of {@code false}.
   * </p>
   * @param instance the {@code Service} subclass instance to expose as a coprocessor endpoint
   * @return {@code true} if the registration was successful, {@code false}
   * otherwise
   */
  boolean registerService(Service instance);

  /**
   * @return true if master is the active one
   */
  boolean isActiveMaster();

  /**
   * @return true if master is initialized
   */
  boolean isInitialized();

  /**
   * @return true if master is in maintanceMode
   * @throws IOException if the inquiry failed due to an IO problem
   */
  boolean isInMaintenanceMode();

  /**
   * Abort a procedure.
   * @param procId ID of the procedure
   * @param mayInterruptIfRunning if the proc completed at least one step, should it be aborted?
   * @return true if aborted, false if procedure already completed or does not exist
   * @throws IOException
   */
  public boolean abortProcedure(final long procId, final boolean mayInterruptIfRunning)
      throws IOException;

  /**
   * Get procedures
   * @return procedure list
   * @throws IOException
   */
  public List<Procedure<?>> getProcedures() throws IOException;

  /**
   * Get locks
   * @return lock list
   * @throws IOException
   */
  public List<LockedResource> getLocks() throws IOException;

  /**
   * Get list of table descriptors by namespace
   * @param name namespace name
   * @return descriptors
   * @throws IOException
   */
  public List<TableDescriptor> listTableDescriptorsByNamespace(String name) throws IOException;

  /**
   * Get list of table names by namespace
   * @param name namespace name
   * @return table names
   * @throws IOException
   */
  public List<TableName> listTableNamesByNamespace(String name) throws IOException;

  /**
   * @param table the table for which last successful major compaction time is queried
   * @return the timestamp of the last successful major compaction for the passed table,
   * or 0 if no HFile resulting from a major compaction exists
   * @throws IOException
   */
  public long getLastMajorCompactionTimestamp(TableName table) throws IOException;

  /**
   * @param regionName
   * @return the timestamp of the last successful major compaction for the passed region
   * or 0 if no HFile resulting from a major compaction exists
   * @throws IOException
   */
  public long getLastMajorCompactionTimestampForRegion(byte[] regionName) throws IOException;

  /**
   * @return load balancer
   */
  public LoadBalancer getLoadBalancer();

  boolean isSplitOrMergeEnabled(MasterSwitchType switchType);

  /**
   * @return Favored Nodes Manager
   */
  public FavoredNodesManager getFavoredNodesManager();

  /**
   * Add a new replication peer for replicating data to slave cluster
   * @param peerId a short name that identifies the peer
   * @param peerConfig configuration for the replication slave cluster
   * @param enabled peer state, true if ENABLED and false if DISABLED
   */
  long addReplicationPeer(String peerId, ReplicationPeerConfig peerConfig, boolean enabled)
      throws ReplicationException, IOException;

  /**
   * Removes a peer and stops the replication
   * @param peerId a short name that identifies the peer
   */
  long removeReplicationPeer(String peerId) throws ReplicationException, IOException;

  /**
   * Restart the replication stream to the specified peer
   * @param peerId a short name that identifies the peer
   */
  long enableReplicationPeer(String peerId) throws ReplicationException, IOException;

  /**
   * Stop the replication stream to the specified peer
   * @param peerId a short name that identifies the peer
   */
  long disableReplicationPeer(String peerId) throws ReplicationException, IOException;

  /**
   * Returns the configured ReplicationPeerConfig for the specified peer
   * @param peerId a short name that identifies the peer
   * @return ReplicationPeerConfig for the peer
   */
  ReplicationPeerConfig getReplicationPeerConfig(String peerId) throws ReplicationException,
      IOException;

  /**
   * Returns the {@link ReplicationPeerManager}.
   */
  ReplicationPeerManager getReplicationPeerManager();

  /**
   * Update the peerConfig for the specified peer
   * @param peerId a short name that identifies the peer
   * @param peerConfig new config for the peer
   */
  long updateReplicationPeerConfig(String peerId, ReplicationPeerConfig peerConfig)
      throws ReplicationException, IOException;

  /**
   * Return a list of replication peers.
   * @param regex The regular expression to match peer id
   * @return a list of replication peers description
   */
  List<ReplicationPeerDescription> listReplicationPeers(String regex) throws ReplicationException,
      IOException;

  /**
   * @return {@link LockManager} to lock namespaces/tables/regions.
   */
  LockManager getLockManager();

  public String getRegionServerVersion(final ServerName sn);

  /**
   * Called when a new RegionServer is added to the cluster.
   * Checks if new server has a newer version than any existing server and will move system tables
   * there if so.
   */
  public void checkIfShouldMoveSystemRegionAsync();

  String getClientIdAuditPrefix();

  /**
   * @return True if cluster is up; false if cluster is not up (we are shutting down).
   */
  boolean isClusterUp();

  /**
   * @return return null if current is zk-based WAL splitting
   */
  default SplitWALManager getSplitWALManager(){
    return null;
  }

  /**
   * Execute region plans with throttling
   * @param plans to execute
   * @return succeeded plans
   */
  List<RegionPlan> executeRegionPlansWithThrottling(List<RegionPlan> plans);

  /**
   * Run the ReplicationBarrierChore.
   */
  void runReplicationBarrierCleaner();
}
