content: /*
   * Copyright 1999-2018 Alibaba Group Holding Ltd.
   *
   * 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.alibaba.csp.sentinel;
  
  import com.alibaba.csp.sentinel.node.ClusterNode;
  import com.alibaba.csp.sentinel.node.DefaultNode;
  import com.alibaba.csp.sentinel.node.EntranceNode;
  import com.alibaba.csp.sentinel.slotchain.StringResourceWrapper;
  import com.alibaba.csp.sentinel.util.VersionUtil;
  
  /**
   * Universal constants of Sentinel.
   *
   * @author qinan.qn
   * @author youji.zj
   * @author jialiang.linjl
   * @author Eric Zhao
   */
  public final class Constants {
  
      public static final String SENTINEL_VERSION = VersionUtil.getVersion("1.8.8");
  
      public final static int MAX_CONTEXT_NAME_SIZE = 2000;
      public final static int MAX_SLOT_CHAIN_SIZE = 6000;
  
      public final static String ROOT_ID = "machine-root";
      public final static String CONTEXT_DEFAULT_NAME = "sentinel_default_context";
  
      /**
       * A virtual resource identifier for total inbound statistics (since 1.5.0).
       */
      public final static String TOTAL_IN_RESOURCE_NAME = "__total_inbound_traffic__";
  
      /**
       * A virtual resource identifier for cpu usage statistics (since 1.6.1).
       */
      public final static String CPU_USAGE_RESOURCE_NAME = "__cpu_usage__";
  
      /**
       * A virtual resource identifier for system load statistics (since 1.6.1).
       */
      public final static String SYSTEM_LOAD_RESOURCE_NAME = "__system_load__";
  
      /**
       * Global ROOT statistic node that represents the universal parent node.
       */
      public final static DefaultNode ROOT = new EntranceNode(new StringResourceWrapper(ROOT_ID, EntryType.IN),
          new ClusterNode(ROOT_ID, ResourceTypeConstants.COMMON));
  
      /**
       * Global statistic node for inbound traffic. Usually used for {@code SystemRule} checking.
       */
      public final static ClusterNode ENTRY_NODE = new ClusterNode(TOTAL_IN_RESOURCE_NAME, ResourceTypeConstants.COMMON);
  
      /**
       * The global switch for Sentinel.
       */
      public static volatile boolean ON = true;
  
      /**
       * Order of default processor slots
       */
      public static final int ORDER_NODE_SELECTOR_SLOT = -10000;
      public static final int ORDER_CLUSTER_BUILDER_SLOT = -9000;
      public static final int ORDER_LOG_SLOT = -8000;
      public static final int ORDER_STATISTIC_SLOT = -7000;
      public static final int ORDER_AUTHORITY_SLOT = -6000;
      public static final int ORDER_SYSTEM_SLOT = -5000;
      public static final int ORDER_FLOW_SLOT = -2000;
      public static final int ORDER_DEFAULT_CIRCUIT_BREAKER_SLOT = -1500;
      public static final int ORDER_DEGRADE_SLOT = -1000;
  
      private Constants() {}
  }
  