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Ice is a comprehensive RPC framework that helps you build distributed applications with minimal effort using familiar object-oriented idioms

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//
// Copyright (c) ZeroC, Inc. All rights reserved.
//

package com.zeroc.IceInternal;

public class RetryQueue
{
    RetryQueue(Instance instance)
    {
        _instance = instance;
    }

    synchronized public void add(ProxyOutgoingAsyncBase outAsync, int interval)
    {
        if(_instance == null)
        {
            throw new com.zeroc.Ice.CommunicatorDestroyedException();
        }
        RetryTask task = new RetryTask(_instance, this, outAsync);
        outAsync.cancelable(task); // This will throw if the request is canceled
        task.setFuture(_instance.timer().schedule(task, interval, java.util.concurrent.TimeUnit.MILLISECONDS));
        _requests.add(task);
    }

    synchronized public void destroy()
    {
        if(_instance == null)
        {
            return; // Already destroyed.
        }

        java.util.HashSet keep = new java.util.HashSet<>();
        for(RetryTask task : _requests)
        {
            if(!task.destroy())
            {
                keep.add(task);
            }
        }
        _requests = keep;
        _instance = null;

        //
        // Wait for the tasks to be executed, it shouldn't take long
        // since they couldn't be canceled. If interrupted, we
        // preserve the interrupt.
        //
        boolean interrupted = false;
        while(!_requests.isEmpty())
        {
            try
            {
                wait();
            }
            catch(InterruptedException ex)
            {
                interrupted = true;
            }
        }
        if(interrupted)
        {
            Thread.currentThread().interrupt();
        }
    }

    synchronized boolean remove(RetryTask task)
    {
        boolean removed = _requests.remove(task);
        if(_instance == null && _requests.isEmpty())
        {
            notify();
        }
        return removed;
    }

    private Instance _instance;
    private java.util.HashSet _requests = new java.util.HashSet<>();
}