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.runtime.compilation;
  
  import com.alibaba.compileflow.engine.core.runtime.ProcessRuntimeWrapper;
  
  import java.util.Collection;
  import java.util.concurrent.CompletableFuture;
  
  /**
   * Single-flight registry for compilation tasks keyed by digest.
   * First caller installs; others share the same future; removed on completion.
   *
   * @author yusu
   */
  public interface InflightCompilationRegistry extends AutoCloseable {
  
      /**
       * Puts a new slot for the digest if absent, returning the existing one if already present.
       */
      CompletableFuture<ProcessRuntimeWrapper> putIfAbsent(String digest, CompletableFuture<ProcessRuntimeWrapper> slot);
  
      /**
       * Removes the digest-slot mapping if it is the same slot.
       */
      void remove(String digest, CompletableFuture<ProcessRuntimeWrapper> slot);
  
      /**
       * @return a snapshot view of all inflight futures.
       */
      Collection<CompletableFuture<ProcessRuntimeWrapper>> values();
  
      /**
       * @return number of inflight entries.
       */
      int size();
  
      /**
       * Clears all entries.
       */
      void clear();
  }
  
  
  