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os/dynamic_rom_session.h: support Xml_generator 

This patch adds a special variant of a 'Content_producer' called
'Xml_producer', which allows the direct use of an 'Xml_generator'
for generating the ROM-module content.
This commit is contained in:
Norman Feske 2020-01-12 22:25:26 +01:00 committed by Christian Helmuth
parent 78c0e5f6b6
commit c67a0d3dd8
1 changed files with 43 additions and 6 deletions
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49
repos/os/include/os/dynamic_rom_session.h
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@ -15,6 +15,7 @@
#define _INCLUDE__OS__DYNAMIC_ROM_SESSION_H_
#include <util/reconstructible.h>
#include <util/xml_generator.h>
#include <base/rpc_server.h>
#include <base/session_label.h>
#include <base/attached_ram_dataspace.h>
@ -29,7 +30,7 @@ class Genode::Dynamic_rom_session : public Rpc_object<Rom_session>
struct Content_producer : Interface
{
class Buffer_capacity_exceeded : Exception { };
using Buffer_capacity_exceeded = Xml_generator::Buffer_exceeded;
/**
* Write content into the specified buffer
@ -39,6 +40,34 @@ class Genode::Dynamic_rom_session : public Rpc_object<Rom_session>
virtual void produce_content(char *dst, size_t dst_len) = 0;
};
class Xml_producer : public Content_producer
{
public:
typedef String<64> Node_name;
private:
Node_name const _node_name;
void produce_content(char *dst, size_t dst_len) override
{
Xml_generator xml(dst, dst_len, _node_name.string(), [&] () {
produce_xml(xml); });
}
public:
Xml_producer(Node_name node_name) : _node_name(node_name) { }
/**
* Generate ROM content
*
* \throw Xml_generator::Buffer_exceeded
*/
virtual void produce_xml(Xml_generator &) = 0;
};
private:
/*
@ -131,6 +160,16 @@ class Genode::Dynamic_rom_session : public Rpc_object<Rom_session>
public:
Dynamic_rom_session(Rpc_entrypoint &ep,
Ram_allocator &ram,
Region_map &rm,
Content_producer &content_producer)
:
_ep(ep), _ram(ram), _rm(rm), _content_producer(content_producer)
{
_ep.manage(this);
}
/**
* Constructor
*
@ -146,15 +185,13 @@ class Genode::Dynamic_rom_session : public Rpc_object<Rom_session>
*
* The 'Dynamic_rom_session' associates/disassociates itself with 'ep'.
*/
Dynamic_rom_session(Rpc_entrypoint &ep,
Dynamic_rom_session(Entrypoint &ep,
Ram_allocator &ram,
Region_map &rm,
Content_producer &content_producer)
:
_ep(ep), _ram(ram), _rm(rm), _content_producer(content_producer)
{
_ep.manage(this);
}
Dynamic_rom_session(ep.rpc_ep(), ram, rm, content_producer)
{ }
~Dynamic_rom_session() { _ep.dissolve(this); }