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An intelligent way of booting complex applications and services according to their dependencies

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package io.datakernel.util.guice;

import com.google.inject.Inject;

import java.util.function.Consumer;
import java.util.function.Supplier;

public final class OptionalDependency {
	@Inject(optional = true)
	private T value;

	public T get() {
		return value;
	}

	public boolean isPresent() {
		return value != null;
	}

	public void ifPresent(Consumer consumer) {
		if (value != null) {
			consumer.accept(value);
		}
	}

	public T orElse(T defaultValue) {
		return value != null ? value : defaultValue;
	}

	public T orElseGet(Supplier defaultValue) {
		return value != null ? value : defaultValue.get();
	}
}