Question

我正在尝试使用https://dzone.com/articles/getting-started-with-apache-ignitenet-part-3-cache

中给出的ScanQuery示例

我创建了具有Person类的Ignite服务器，如下所示：

class Program
{
    static void Main(string[] args)
    {
        var cfg = new IgniteConfiguration
        {
            // Register custom class for Ignite serialization
            BinaryConfiguration = new BinaryConfiguration(typeof(Person))
        };
        cfg.BinaryConfiguration.NameMapper = new BinaryBasicNameMapper() { IsSimpleName = true };

        IIgnite ignite = Ignition.Start(cfg);
        ICache<int, Person> cache = ignite.GetOrCreateCache<int, Person>("persons");

        for (int i = 0; i < 10; i++)
        {
            Console.WriteLine("Inserting " + i + "th Person");
            cache.Put(i, new Person() { Name = "Person " + i, Age = (i + 1) * 10 });
        }

        Console.WriteLine("***** Ignite Server Started and Ready *****");

        Console.ReadLine();
    }
}

public class Person
{
    public string Name { get; set; }
    public int Age { get; set; }
    public override string ToString()
    {
        return $"Person [Name={Name}, Age={Age}]";
    }
}

和如下所示的胖客户端

class Program
{
    static void Main(string[] args)
    {
        var cfg = new IgniteConfiguration
        {
            // Register custom class for Ignite serialization
            BinaryConfiguration = new BinaryConfiguration(typeof(Person), typeof(PersonFilter))
        };
        cfg.ClientMode = true;
        cfg.BinaryConfiguration.NameMapper = new BinaryBasicNameMapper() { IsSimpleName = true };

        IIgnite ignite = Ignition.Start(cfg);
        ICache<int, Person> cache = ignite.GetOrCreateCache<int, Person>("persons");

        //ScanQuery with Filter
        var scanQuery = new ScanQuery<int, Person>(new PersonFilter());
        IQueryCursor<ICacheEntry<int, Person>> queryCursor = cache.Query(scanQuery);
        foreach (ICacheEntry<int, Person> cacheEntry in queryCursor)
            Console.WriteLine(cacheEntry);

        Console.ReadLine();
    }
}

public class Person
{
    public string Name { get; set; }
    public int Age { get; set; }
    public override string ToString()
    {
        return $"Person [Name={Name}, Age={Age}]";
    }
}

public class PersonFilter : ICacheEntryFilter<int, Person>
{
    public bool Invoke(ICacheEntry<int, Person> entry)
    {
        return entry.Key % 2 == 0;
    }
}

当我同时运行它们时，胖客户端将引发错误：

JavaException：类org.apache.ignite.IgniteCheckedException：无法注入资源[method = setIgniteInstance，target = org.apache.ignite.internal.processors.platform.cache.PlatformCacheEntryFilterImpl @ 15b7b1c，rsrc = IgniteKernal [longJVMPauseDetector = …

但是，如果我也在IgniteServer项目中复制PersonFilter并将其添加到BinaryConfiguration类型，则此错误消失。

它应该如何工作？我认为客户端可以在运行时创建自己的过滤器，然后对服务器运行它们。那不是真的吗如果服务器是用JAVA编写的，客户端是.NET的，它将如何工作？

Answer 1

是的，ScanQuery要求在服务器端提供过滤器实现。

如果服务器是用JAVA编写的，而客户端是.NET的，它将如何工作

这是行不通的，因为Ignite需要在服务器端执行.NET筛选器，而纯Java服务器节点无法做到这一点。

Ignite.Net ScanQuery“无法注入资源”

1 个答案: