Database system employing polymorphic entry and entry matching
    1.
    发明授权
    Database system employing polymorphic entry and entry matching 失效
    数据库系统采用多态条目和条目匹配

    公开(公告)号:US6032151A

    公开(公告)日:2000-02-29

    申请号:US971529

    申请日:1997-11-17

    IPC分类号: G06F9/445 G06F17/30

    摘要: A database system wherein one or more entry databases store a plurality of entries. Each entry is of a given type that defines the fields of the entry. Each of the fields contains or identifies an object with associated attributes or data. The type of each entry may further define behavior in the form of methods the entry is configured to implement. An entry type which is a subtype of another inherits all of the fields and behavior of its supertype, and contains additional fields and/or defines new/modified behavior. Entries may be expressed in a Java.TM. class of the Java.TM. programming language. The database system may further employ a search engine which allows queries to be made upon entries in the database. In one implementation, the queries include a read operation, a take operation, and a notify operation. Each query request includes a command indicating the type of operation, and a template which is an entry object having some or all of its fields set to specified values that must be matched exactly. Other fields of the template entry may be specified as wildcards, whose values do not matter. The search engine may further be configured to create an index for entries having characteristics which are commonly specified by queries. Thus, the search engine may detect a pattern of usage and create an index which points to entries having attributes which are commonly specified by received templates. In this manner, expedient entry searching may be accommodated.

    摘要翻译: 数据库系统,其中一个或多个条目数据库存储多个条目。 每个条目都是给定类型,用于定义条目的字段。 每个字段包含或标识具有关联属性或数据的对象。 每个条目的类型可以进一步以条目被配置为实现的方式的形式定义行为。 作为另一个子类型的条目类型继承其超类型的所有字段和行为,并包含其他字段和/或定义新的/修改的行为。 条目可以在Java TM编程语言的Java TM类中表示。 数据库系统还可以采用允许在数据库中的条目进行查询的搜索引擎。 在一个实现中,查询包括读操作,执行操作和通知操作。 每个查询请求包括指示操作类型的命令,以及作为条目对象的模板,其中的一些或所有字段被设置为必须精确匹配的指定值。 模板条目的其他字段可以指定为通配符,其值无关紧要。 搜索引擎还可以被配置为为具有通常由查询指定的特征的条目创建索引。 因此,搜索引擎可以检测使用模式并创建指向具有由接收的模板通常指定的属性的条目的索引。 以这种方式,可以适应有利的条目搜索。

    Deferred reconstruction of objects and remote loading in a distributed system
    7.
    发明授权
    Deferred reconstruction of objects and remote loading in a distributed system 失效
    对象的延迟重建和分布式系统中的远程加载

    公开(公告)号:US06253256B1

    公开(公告)日:2001-06-26

    申请号:US08950756

    申请日:1997-10-15

    IPC分类号: G06F1300

    CPC分类号: G06F9/542 G06F9/548

    摘要: A method and system for transmitting objects in an object-oriented distributed system allows the reconstruction of objects and downloading of code associated with such object reconstruction to be deferred until it is needed by a program. The deferred reconstruction is accomplished by using a Java object called a “marshalled object,” which is a self-describing stream and which is a first-class entity in the system, meaning that it exists within a type system of a programming language and can be accessed and manipulated by instructions written in that language. Such an object can typically be produced by any object that can be passed from one address space to another, and it can be stored, passed to other objects, or used to reconstruct an object of the original type on demand. The reconstruction of an object is deferred until the code holding a marshalled object directly calls the creation of the object using the marshalled object. Any downloading of code is also deferred until the marshalled object is used to create a copy of the original object.

    摘要翻译: 用于在面向对象的分布式系统中传送对象的方法和系统允许对对象的重建和与这样的对象重建相关联的代码的下载被推迟直到程序需要。 延迟重建通过使用称为“编组对象”的Java对象来实现,该对象是自描述流,并且是系统中的第一类实体,意味着它存在于编程语言的类型系统中,并且可以 通过用该语言编写的指令进行访问和操作。 这样的对象通常可以由可以从一个地址空间传递到另一个地址空间的任何对象来生成,并且可以将其存储,传递给其他对象,或用于根据需要重建原始类型的对象。 一个对象的重建被推迟,直到保持编组对象的代码直接使用编组对象来调用对象的创建。 代码的任何下载也被推迟到使用编组的对象来创建原始对象的副本。

    Method and apparatus for dynamic distributed computing over a network
    9.
    发明授权
    Method and apparatus for dynamic distributed computing over a network 失效
    通过网络进行动态分布式计算的方法和装置

    公开(公告)号:US06446070B1

    公开(公告)日:2002-09-03

    申请号:US09030840

    申请日:1998-02-26

    IPC分类号: G06F900

    摘要: A homogeneous execution environment operates within a heterogeneous client-server network. A client selects a server and transmits a procedure call with parameters. In response, the system dynamically and securely downloads code to a compute server; invokes a generic compute method; executes the code on the compute server; and returns the results to the calling client method, preserving the result on the compute server if requested. This technique is efficient in that it does not require multiple copies of code to be downloaded or compiled since server byte-codes can be executed on each of the different systems. The code can be compiled once and downloaded as needed to the various servers as byte-codes and then executed.

    摘要翻译: 均匀的执行环境在异构的客户端 - 服务器网络内运行。 客户端选择一个服务器并发送具有参数的过程调用。 作为响应,系统动态安全地将代码下载到计算服务器; 调用通用计算方法; 执行计算服务器上的代码; 并将结果返回给调用客户端方法,如果请求,则在计算服务器上保留结果。 这种技术是有效的,因为不需要下载或编译多个代码副本,因为可以在每个不同的系统上执行服务器字节码。 代码可以编译一次,并根据需要下载到各种服务器作为字节代码,然后执行。