47 lines
1.1 KiB
Java
47 lines
1.1 KiB
Java
package com.djrapitops.plan.data.store;
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import java.util.concurrent.TimeUnit;
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import java.util.function.Supplier;
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/**
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* Caching layer between Supplier and caller.
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* <p>
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* Refreshes the value if 30 seconds have passed since the last call.
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*
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* @author Rsl1122
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*/
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public class CachingSupplier<T> implements Supplier<T> {
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private final Supplier<T> original;
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private T cachedValue;
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private long cacheTime;
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private long timeToLive;
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public CachingSupplier(Supplier<T> original) {
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this(original, TimeUnit.SECONDS.toMillis(30L));
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}
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public CachingSupplier(Supplier<T> original, long timeToLive) {
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this.original = original;
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this.timeToLive = timeToLive;
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cacheTime = 0L;
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}
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@Override
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public T get() {
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if (cachedValue == null || System.currentTimeMillis() - cacheTime > timeToLive) {
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cachedValue = original.get();
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cacheTime = System.currentTimeMillis();
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}
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return cachedValue;
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}
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public boolean isCached() {
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return cachedValue != null;
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}
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public long getCacheTime() {
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return cacheTime;
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}
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} |