CompletedFuture.java

package de.invesdwin.util.concurrent;

import java.util.concurrent.ExecutionException;
import java.util.concurrent.Future;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;

import javax.annotation.concurrent.Immutable;

@Immutable
public class CompletedFuture<V> implements Future<V> {

    private final V value;

    public CompletedFuture(final V value) {
        this.value = value;
    }

    @Override
    public boolean cancel(final boolean mayInterruptIfRunning) {
        return false;
    }

    @Override
    public boolean isCancelled() {
        return false;
    }

    @Override
    public boolean isDone() {
        return true;
    }

    @Override
    public V get() throws InterruptedException, ExecutionException {
        return value;
    }

    @Override
    public V get(final long timeout, final TimeUnit unit)
            throws InterruptedException, ExecutionException, TimeoutException {
        return value;
    }

}