/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.apache.brooklyn.util.core.task;
import com.google.common.base.Supplier;
/**
* A class that supplies objects of a single type. When used as a ConfigKey value,
* the evaluation is deferred until getConfig() is called. The returned value will then
* be coerced to the correct type.
*
* Subsequent calls to getConfig will result in further calls to deferredProvider.get(),
* rather than reusing the result. If you want to reuse the result, consider instead
* using a Future.
*
* Note that this functionality replaces the ues of Closure in brooklyn 0.4.0, which
* served the same purpose.
*/
public interface DeferredSupplier<T> extends Supplier<T> {
@Override
T get();
}