/**
 * 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.
 */
syntax = "proto2";

package hbase.pb;

option java_package = "org.apache.hadoop.hbase.shaded.protobuf.generated";
option java_outer_classname = "LockServiceProtos";
option java_generic_services = true;
option java_generate_equals_and_hash = true;
option optimize_for = SPEED;

import "HBase.proto";
import "Procedure.proto";

enum LockType {
  EXCLUSIVE = 1;
  SHARED = 2;
}

message LockRequest {
  required LockType lock_type = 1;
  optional string namespace = 2;
  optional TableName table_name = 3;
  repeated RegionInfo region_info = 4;
  optional string description = 5;
  optional uint64 nonce_group = 6 [default = 0];
  optional uint64 nonce = 7 [default = 0];
}

message LockResponse {
  required uint64 proc_id = 1;
}

message LockHeartbeatRequest {
  required uint64 proc_id = 1;
  optional bool keep_alive = 2 [default = true];
}

message LockHeartbeatResponse {
  enum LockStatus {
    UNLOCKED = 1;
    LOCKED = 2;
  }

  required LockStatus lock_status = 1;
  // Timeout of lock (if locked).
  optional uint32 timeout_ms = 2;
}

message LockProcedureData {
  required LockType lock_type = 1;
  optional string namespace = 2;
  optional TableName table_name = 3;
  repeated RegionInfo region_info = 4;
  optional string description = 5;
  optional bool is_master_lock = 6 [default = false];
}

enum LockedResourceType {
  SERVER = 1;
  NAMESPACE = 2;
  TABLE = 3;
  REGION = 4;
  PEER = 5;
}

message LockedResource {
  required LockedResourceType resource_type = 1;
  optional string resource_name = 2;
  required LockType lock_type = 3;
  optional Procedure exclusive_lock_owner_procedure = 4;
  optional int32 shared_lock_count = 5;
  repeated Procedure waitingProcedures = 6;
}

service LockService {
  /** Acquire lock on namespace/table/region */
  rpc RequestLock(LockRequest) returns(LockResponse);

  /** Keep alive (or not) a previously acquired lock */
  rpc LockHeartbeat(LockHeartbeatRequest) returns(LockHeartbeatResponse);
}
