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The LightStep OpenTracing Tracer implementation for Java

There is a newer version: 0.32.0

package com.lightstep.tracer.shared;

/**
 * Simple Future/Promise-like class.
 *
 * Acts as a simple wrapper on Object wait() / notify() - avoiding the
 * complex future interfaces in Java 7/8.
 */
public class SimpleFuture {
    private boolean resolved;
    private T value;

    @SuppressWarnings("WeakerAccess")
    public SimpleFuture() {
        resolved = false;
    }

    @SuppressWarnings("WeakerAccess")
    public SimpleFuture(T value) {
        this.value = value;
        resolved = true;
    }

    public void set(T value) {
        synchronized (this) {
            this.value = value;
            resolved = true;
            notifyAll();
        }
    }

    public T get() throws InterruptedException {
        if (!resolved) {
            synchronized (this) {
                wait();
            }
        }
        return value;
    }

    @SuppressWarnings({"unused", "WeakerAccess"})
    public T getWithTimeout(long millis) throws InterruptedException {
        if (!resolved) {
            synchronized (this) {
                wait(millis);
            }
        }
        return value;
    }
}