io.fabric8.spring.cloud.kubernetes.LazilyInstantiate Maven / Gradle / Ivy

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/*
 *     Copyright (C) 2016 to the original authors.
 *
 *     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.fabric8.spring.cloud.kubernetes;


import java.util.function.Supplier;

public class LazilyInstantiate implements Supplier {

    public static  LazilyInstantiate using(Supplier supplier) {
        return new LazilyInstantiate(supplier);
    }

    public synchronized T get() {
        return current.get();
    }

    private LazilyInstantiate(Supplier supplier) {
        this.supplier = supplier;
        this.current = () -> swapper();
    }

    private final Supplier supplier;
    private Supplier current;

    private T swapper() {
        T obj = supplier.get();
        current = () -> obj;
        return obj;
    }
}