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.async.process;
  
  import io.activej.common.recycle.Recyclers;
  import io.activej.promise.Promise;
  import io.activej.reactor.ImplicitlyReactive;
  import org.jetbrains.annotations.Nullable;
  
  import static io.activej.reactor.Reactive.checkInReactorThread;
  
  public abstract class AbstractAsyncCloseable extends ImplicitlyReactive implements AsyncCloseable {
  	private @Nullable AsyncCloseable closeable;
  
  	private Exception exception;
  
  	public Exception getException() {
  		return exception;
  	}
  
  	public @Nullable AsyncCloseable getCloseable() {
  		return closeable;
  	}
  
  	public final void setCloseable(@Nullable AsyncCloseable closeable) {
  		this.closeable = closeable;
  	}
  
  	protected void onClosed(Exception e) {
  	}
  
  	protected void onCleanup() {
  	}
  
  	@Override
  	public final void closeEx(Exception e) {
  		checkInReactorThread(this);
  		if (isClosed()) return;
  		exception = e;
  		reactor.post(this::onCleanup);
  		onClosed(e);
  		if (closeable != null) {
  			closeable.closeEx(e);
  			closeable = null;
  		}
  	}
  
  	public final boolean isClosed() {
  		return exception != null;
  	}
  
  	public final <T> Promise<T> sanitize(Promise<T> promise) {
  		return promise.async()
  			.then(this::doSanitize);
  	}
  
  	protected final <T> Promise<T> doSanitize(T value, @Nullable Exception e) {
  		if (exception != null) {
  			Recyclers.recycle(value);
  			if (value instanceof AsyncCloseable) {
  				((AsyncCloseable) value).closeEx(exception);
  			}
  			return Promise.ofException(exception);
  		}
  		if (e == null) {
  			return Promise.of(value);
  		} else {
  			closeEx(e);
  			return Promise.ofException(e);
  		}
  	}
  
  }
  