vlink::SchemaPluginManager类 参考

Singleton manager that owns and provides access to the SchemaPluginInterface. 更多...

#include <schema_plugin_manager.h>

vlink::SchemaPluginManager 的协作图:

Public 成员函数
bool	is_valid () const
	Returns true if a SchemaPluginInterface was successfully loaded.
std::shared_ptr< SchemaPluginInterface >	get_interface () const
	Returns the loaded SchemaPluginInterface instance.

静态 Public 成员函数
static SchemaPluginManager &	get (const std::string &schema_plugin_path="")
	Returns the process-global SchemaPluginManager singleton.

详细描述

Singleton manager that owns and provides access to the SchemaPluginInterface.

SchemaPluginManager is a process-level singleton that loads and holds a single SchemaPluginInterface plugin. The plugin path is resolved in the following order:

1. The schema_plugin_path argument passed to get() on first call.
2. The VLINK_SCHEMA_PLUGIN environment variable if schema_plugin_path is empty.
3. No plugin loaded (the manager is invalid) if neither is set.

Usage

// Load by environment variable VLINK_SCHEMA_PLUGIN:
auto& mgr = vlink::SchemaPluginManager::get();
 
// Or explicitly (first call wins):
auto& mgr = vlink::SchemaPluginManager::get("/path/to/my_schema_plugin.so");
 
if (mgr.is_valid()) {
    auto iface = mgr.get_interface();
    auto schema = iface->search_schema("my_pkg.MyMessage", SchemaType::kProtobuf);
}

注解

• get() creates the singleton on first call; subsequent calls ignore schema_plugin_path.
• is_valid() returns false when no plugin was loaded.
• The plugin interface is released before the Plugin loader on destruction, ensuring safe unloading.

成员函数说明

get()

SchemaPluginManager & vlink::SchemaPluginManager::get ( const std::string & schema_plugin_path = "" )

staticnodiscard

Returns the process-global SchemaPluginManager singleton.

On the first call, loads the plugin from schema_plugin_path if non-empty, or from the VLINK_SCHEMA_PLUGIN environment variable. Subsequent calls return the same singleton regardless of schema_plugin_path.

参数

schema_plugin_path

Path to the plugin shared library. Empty = use env var.

返回

Reference to the singleton.

get_interface()

std::shared_ptr< SchemaPluginInterface > vlink::SchemaPluginManager::get_interface ( ) const

nodiscard

Returns the loaded SchemaPluginInterface instance.

返回

Shared pointer to the interface, or nullptr if not loaded.

is_valid()

bool vlink::SchemaPluginManager::is_valid ( ) const

nodiscard

Returns true if a SchemaPluginInterface was successfully loaded.

返回

true if get_interface() will return a non-null pointer.

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该类的文档由以下文件生成:

• include/vlink/extension/schema_plugin_manager.h