content: /*
   * Copyright (C) 2020 ActiveJ LLC.
   *
   * 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 io.activej.inject;
  
  /**
   * This is a function which can inject instances into {@link io.activej.inject.annotation.Inject}
   * fields and methods of some <b>already existing object</b>.
   * This is so-called 'post-injections' since such injections are not part of object creation.
   * <p>
   * It can only be obtained by depending on it and then requesting it from the {@link Injector injector}.
   */
  public interface InstanceInjector<T> {
  	Key<T> key();
  
  	void injectInto(T existingInstance);
  }
  