SNMP4J-Agentgen：使用指南与代码生成

snmp4j,agentgen

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"SNMP4J-Agentgen是一款针对SNMP领域的代码生成工具，它基于SMI（Structure of Management Information）模型语言，与ASN.1不同，SMI是专门为SNMP设计的领域特定建模语言。SMI可以详细描述管理对象的静态结构。尽管SMIv1和SMIv2在机器可读性方面存在不足，但它们足以完全定义管理对象的结构。 SNMP（Simple Network Management Protocol）是一种广泛使用的网络管理协议，用于监控和管理网络设备。在SNMP框架下，Agentgen扮演了重要角色，它能够根据SNMP4J-Agent API的需求生成相应的源代码。SNMP4J-Agent是一个命令响应器API，允许开发者创建能够响应SNMP命令的代理应用。代码生成模板是AgenPro的核心组成部分，它可以根据特定的SMI模型自定义和扩展。当使用SNMP4J-Agent的代码生成模板时，AgenPro能够生成符合SNMP4J-Agent API规范的代码，这得益于模板中内置的关于SNMP4J-Agent API域的知识。在SNMP4J-Agentgen的开发过程中，理解SMI语言至关重要。SMI提供了定义网络管理信息结构的机制，包括对象类型、对象标识符（OIDs）、访问控制规则以及对象间的依赖关系。通过SMI，开发者能够清晰地定义管理信息库（MIBs），这些MIBs包含了网络设备的配置信息和状态数据。代码生成是模型驱动工程（MDE）的一部分，它允许从高级抽象模型直接生成底层实现代码，从而提高效率和准确性。AgenPro通过模板定制，使得开发者可以根据自己的需求调整生成的代码，适应各种不同的SNMP应用环境。在实际应用中，开发者首先使用SMI定义MIB结构，然后AgenPro将这些MIB转换为Java代码，这些代码可以直接集成到SNMP代理应用中。生成的代码通常包括对SNMP PDU（Protocol Data Units）的处理、对象的存取方法以及必要的通知（trap）发送功能。 SNMP4J-Agentgen提供了一个强大而灵活的工具，帮助开发者快速构建符合SNMP标准的管理代理，减少了手动编写代码的工作量，提高了开发效率，并确保了代码与SNMP规范的一致性。通过深入理解和利用SMI、AgenPro以及SNMP4J-Agent，开发者可以更加高效地管理和监控网络环境。"

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Scalar Write Access

In the above example, there are no resources allocated in the preparation

phase. Instead the resources (i.e. the task) necessary to commit the SET

operation are allocated in the commit phase.

In either case such resources need to be freed during the clean-up phase.

The MOScalar.cleanup sets the userObject property of the

SubRequest instance to null. So in many cases, there is no need to

overwrite that method.

Each SubRequest can hold a pointer to an Object by its use-

rObject member. In contrast to the undoValue member, the use-

rObject is not used by the SNMP4J-Agent API and thus modifying it

does not interfere the API. Modifying the undoValue should only be

done in a direct implementation of the ManagedObject interface, be-

cause the SNMP4J-Agent API fills that member with the old value of the

target managed object instance during the commit phase and cleans up

that reference during the clean-up phase for MOScalar and Default-

MOTable instances.

Table Instrumentation

3 Table Instrumentation

In contrast to a scalar value, a table may have a varying number of instanc-

es. This circumstance is taken into account by SNMP4J-Agent by dividing

the responsibility for the table object instrumentation into the table and its

model.

The table model implements the MOTableModel interface and it is

responsible for providing the managed object instance values that the table

manages. Basically, there are four types of table models in the SNMP con-

text:

 Static table models where the number of rows do not vary or vary only

within intervals of several minutes. These table models implement the

MOTableModel interface.

For most use cases, the concrete DefaultMOTableModel class

can be used without modification. Although the number of rows can-

not be changed directly through a SNMP SET command, static table

models may support write access to their object instances. Create

access, however, cannot be supported by such table models.

 Dynamic table models where the number of rows may vary dynami-

cally within seconds, but as above, create access is not supported.

These table models also implement the MOTableModel interface,

but there is not a default implementation that is ready-to-use.

 Static mutable table models which support managed object instance

(row) creation through SNMP SET in addition to static table models.

Static mutable table models have to implement at least the MOMu-

tableTableModel interface.

For most use cases, the concrete DefaultMOMutableTableM-

odel class can be used without modification.

 Dynamic mutable table models which support managed object

instance (row) creation through SNMP SET while the number of rows

in the model may change frequently. Like static mutable table models,

the dynamic counterpart implements the MOMutableTableM-

odel, however, the default implementation of that interface, the

DefaultMOMutableTableModel class, is often not the best

choice to implement a dynamic mutable table model. In many cases, a

problem specific implementation of the MOMutableTableModel

is necessary.

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