/*
 * Copyright (c) 2009, 2011, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

package java.lang;

/**
 * A resource that must be closed when it is no longer needed.
 *
 * @author Josh Bloch
 * @since 1.7
 */
public interface AutoCloseable {
	/**
	 * Closes this resource, relinquishing any underlying resources.
	 * This method is invoked automatically on objects managed by the
	 * {@code try}-with-resources statement.
	 *
	 * <p>While this interface method is declared to throw {@code
	 * Exception}, implementers are <em>strongly</em> encouraged to
	 * declare concrete implementations of the {@code close} method to
	 * throw more specific exceptions, or to throw no exception at all
	 * if the close operation cannot fail.
	 *
	 * <p><em>Implementers of this interface are also strongly advised
	 * to not have the {@code close} method throw {@link
	 * InterruptedException}.</em>
	 *
	 * This exception interacts with a thread's interrupted status,
	 * and runtime misbehavior is likely to occur if an {@code
	 * InterruptedException} is {@linkplain Throwable#addSuppressed
	 * suppressed}.
	 *
	 * More generally, if it would cause problems for an
	 * exception to be suppressed, the {@code AutoCloseable.close}
	 * method should not throw it.
	 *
	 * <p>Note that unlike the {@link java.io.Closeable#close close}
	 * method of {@link java.io.Closeable}, this {@code close} method
	 * is <em>not</em> required to be idempotent.  In other words,
	 * calling this {@code close} method more than once may have some
	 * visible side effect, unlike {@code Closeable.close} which is
	 * required to have no effect if called more than once.
	 *
	 * However, implementers of this interface are strongly encouraged
	 * to make their {@code close} methods idempotent.
	 *
	 * @throws Exception if this resource cannot be closed
	 */
	void close() throws Exception;
}
