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.csp.supplier;
  
  import io.activej.async.process.AbstractAsyncCloseable;
  import io.activej.async.process.AsyncCloseable;
  import io.activej.common.Checks;
  import io.activej.promise.Promise;
  import org.jetbrains.annotations.Nullable;
  
  import static io.activej.reactor.Reactive.checkInReactorThread;
  
  public abstract class AbstractChannelSupplier<T> extends AbstractAsyncCloseable implements ChannelSupplier<T> {
  	private static final boolean CHECKS = Checks.isEnabled(AbstractChannelSupplier.class);
  
  	protected AbstractChannelSupplier() {
  		setCloseable(null);
  	}
  
  	protected AbstractChannelSupplier(@Nullable AsyncCloseable closeable) {
  		setCloseable(closeable);
  	}
  
  	protected abstract Promise<T> doGet();
  
  	@Override
  	public final Promise<T> get() {
  		if (CHECKS) checkInReactorThread(this);
  		return isClosed() ? Promise.ofException(getException()) : doGet();
  	}
  }
  