content: /*
   * 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 com.alibaba.compileflow.engine.core.version;
  
  import com.alibaba.compileflow.engine.core.extension.Extension;
  import com.alibaba.compileflow.engine.core.extension.ExtensionPoint;
  
  /**
   * Resolves the effective process version given a decision context.
   * Implementations must be fast, pure (no remote I/O), and thread-safe.
   *
   * @author yusu
   */
  public interface VersionSelector extends Extension<VersionSelectContext> {
  
      String EXT_VERSION_RESOLVER_CODE = "com.alibaba.compileflow.engine.core.version.VersionSelector.selectVersion";
  
      /**
       * Resolve the effective version for the given context.
       *
       * @param ctx non-null version decision context
       * @return version string or {@code null} to indicate using active/default version
       */
      @ExtensionPoint(code = EXT_VERSION_RESOLVER_CODE)
      String selectVersion(VersionSelectContext ctx);
  
  }
  
  
  