65 lines
1.3 KiB
Java
65 lines
1.3 KiB
Java
package it.cavallium.warppi.util;
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import java.util.LinkedList;
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import java.util.List;
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import java.util.function.Consumer;
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import java.util.function.Function;
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public class EventSubmitter<T> implements EventSubscriber<T>, Submitter<T> {
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private boolean initialized = false;
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private T value;
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private List<Consumer<T>> subscribers = new LinkedList<>();
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public EventSubmitter() {
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value = null;
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}
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public EventSubmitter(T defaultValue) {
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this.value = defaultValue;
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this.initialized = true;
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}
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public static <T> EventSubmitter<T> create() {
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return new EventSubmitter<>();
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}
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public static <T> EventSubmitter<T> create(T value) {
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return new EventSubmitter<>(value);
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}
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@Override
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public T getLastValue() {
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return value;
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}
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@Override
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public void subscribe(Consumer<T> action) {
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T currentValue = value;
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var newSubscribers = new LinkedList<>(subscribers);
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if (initialized) {
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action.accept(currentValue);
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}
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newSubscribers.add(action);
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subscribers = newSubscribers;
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}
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@Override
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public void submit(T value) {
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this.value = value;
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this.initialized = true;
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for (Consumer<T> subscriber : subscribers) {
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subscriber.accept(value);
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}
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}
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@Override
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public <U> EventSubmitter<U> map(Function<T, U> mapFunction) {
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var eventSubmitter = new EventSubmitter<U>();
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map(eventSubmitter, mapFunction);
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return eventSubmitter;
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}
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}
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