38 lines
855 B
Java
38 lines
855 B
Java
package com.iluwatar.lazy.loading;
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import java.util.function.Supplier;
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/**
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*
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* This lazy loader is thread safe and more efficient than {@link HolderThreadSafe}. It utilizes
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* Java 8 functional interface {@link Supplier<T>} as {@link Heavy} factory.
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*
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*/
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public class Java8Holder {
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private Supplier<Heavy> heavy = () -> createAndCacheHeavy();
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public Java8Holder() {
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System.out.println("Java8Holder created");
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}
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public Heavy getHeavy() {
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return heavy.get();
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}
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private synchronized Heavy createAndCacheHeavy() {
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class HeavyFactory implements Supplier<Heavy> {
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private final Heavy heavyInstance = new Heavy();
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@Override
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public Heavy get() {
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return heavyInstance;
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}
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}
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if (!HeavyFactory.class.isInstance(heavy)) {
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heavy = new HeavyFactory();
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}
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return heavy.get();
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}
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}
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