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.test.rules;
  
  import io.activej.bytebuf.ByteBufPool;
  import org.junit.rules.TestRule;
  import org.junit.runner.Description;
  import org.junit.runners.model.Statement;
  
  import java.lang.annotation.ElementType;
  import java.lang.annotation.Retention;
  import java.lang.annotation.RetentionPolicy;
  import java.lang.annotation.Target;
  
  import static org.junit.Assert.assertEquals;
  
  /**
   * {@link TestRule} that fails if not all byte buffers requested from the {@link ByteBufPool} were recycled properly.
   * <p>
   * Annotation {@link IgnoreLeaks} can be put on a test that wants this rule disabled.
   */
  public final class ByteBufRule implements TestRule {
  	static {
  		System.setProperty("ByteBufPool.stats", "true");
  		System.setProperty("ByteBufPool.registry", "true");
  		System.setProperty("ByteBufPool.minSize", "0");
  		System.setProperty("ByteBufPool.maxSize", "0");
  		System.setProperty("ByteBufPool.clearOnRecycle", "true");
  		System.setProperty("ObjectPool.initialCapacity", "1024");
  	}
  
  	@Override
  	public Statement apply(Statement base, Description description) {
  		if (description.getTestClass().getAnnotation(IgnoreLeaks.class) != null
  			|| description.getAnnotation(IgnoreLeaks.class) != null) {
  			return base;
  		}
  		return new LambdaStatement(() -> {
  			ByteBufPool.clear();
  			base.evaluate();
  			assertEquals(ByteBufPool.getStats().getPoolItemsString(), ByteBufPool.getStats().getCreatedItems(), ByteBufPool.getStats().getPoolItems());
  		});
  	}
  
  	@Retention(RetentionPolicy.RUNTIME)
  	@Target({ElementType.METHOD, ElementType.TYPE})
  	public @interface IgnoreLeaks {
  
  		/**
  		 * An optional description for why the test needs to ignore leaks
  		 */
  		String value() default "";
  	}
  }
  