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/*
 * Copyright (c) OSGi Alliance (2008, 2010). All Rights Reserved.
 *
 * 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 org.osgi.service.blueprint.reflect;

/**
 * Metadata for a reference that will bind to a single matching service in the
 * service registry.
 * 
 * 
 * This is specified by the {@code reference} element.
 * 
 * @ThreadSafe
 * @version $Id: e47861860c5a7916fb1f9a4593ebbcadb5ef05d2 $
 */
public interface ReferenceMetadata extends Target, ServiceReferenceMetadata {

	/**
	 * Return the timeout for service invocations when a backing service is is
	 * unavailable.
	 * 
	 * This is specified by the {@code timeout} attribute of the reference.
	 * 
	 * @return The timeout, in milliseconds, for service invocations when a
	 *         backing service is is unavailable.
	 */
	long getTimeout();
}