Utility class that provides blocking java.lang.Runnable and org.eclipse.jetty.util.Callback instances. These can either be shared (and mutually excluded from concurrent usage) or single usage. The instances are autocloseable and will emit a warning if the instance is not completed within close.

Non shared Runnable

    try(Blocker.Runnable onAction = Blocker.runnable())
    {
        someMethod(onAction);
        onAction.block();
    }

Shared Runnable

    Blocker.SharedRunnable shared = new Blocker.Shared();
    // ...
    try(Blocker.Runnable onAction = shared.runnable())
    {
        someMethod(onAction);
        onAction.block();
    }

Non shared Callback

    try(Blocker.Callback callback = Blocker.callback())
    {
        someMethod(callback);
        callback.block();
    }

Shared Callback

    Blocker.Shared blocker = new Blocker.Shared();
    // ...
    try(Blocker.Callback callback = blocker.callback())
    {
        someMethod(callback);
        callback.block();
    }