com.nhl.link.rest.parser.converter.LazyConverter Maven / Gradle / Ivy

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package com.nhl.link.rest.parser.converter;

import com.fasterxml.jackson.databind.JsonNode;

import java.util.function.Supplier;

public class LazyConverter implements JsonValueConverter {

    private final Supplier> delegateSupplier;
    private volatile JsonValueConverter delegate;
    private final Object lock;

    public LazyConverter(Supplier> delegateSupplier) {
        this.delegateSupplier = delegateSupplier;
        this.lock = new Object();
    }

    @Override
    public T value(JsonNode node) {
        if (delegate == null) {
            synchronized (lock) {
                if (delegate == null) {
                    delegate = delegateSupplier.get();
                }
            }
        }
        return delegate.value(node);
    }
}