Coder Social home page Coder Social logo

jiangshipengv8 / celix Goto Github PK

View Code? Open in Web Editor NEW

This project forked from apache/celix

0.0 0.0 0.0 15.78 MB

Apache Celix - An implementation of the OSGi specification adapted to C and C++

Home Page: https://celix.apache.org/

License: Apache License 2.0

Shell 0.23% JavaScript 0.44% C++ 28.58% Python 0.21% C 62.68% HTML 0.05% CMake 7.78% Assembly 0.03%

celix's Introduction

Apache Celix

License Celix Ubuntu Celix MacOS codecov Coverity Scan Build Status

Apache Celix is a framework for C, C++14 and C++17 to develop dynamic modular software applications using component and in-process service-oriented programming. Apache Celix is inspired by the OSGi specification adapted for C and C++.

Documentation

C++ Usage

Hello World Bundle

Modularity in Celix is achieved by runtime installable bundles and dynamic - in process - services.
A Celix bundle is set of resources packed in a zip containing at least a manifest and almost always some shared library containing the bundle functionality. A Celix bundle can be created using the Celix CMake function add_celix_bundle. A Celix bundle is activated by executing the bundle entry points. For C++ bundles these bundle entry points are generated using the CELIX_GEN_CXX_BUNDLE_ACTIVATOR macro.

Celix applications (Celix containers) can be created with the Celix CMake function add_celix_container. This function generates a C++ main function and is also used to configure default installed bundles. This can be bundles provided by Celix, an other project or build by the project self.

//src/MyBundleActivator.cc
#include <iostream>
#include "celix/BundleActivator.h"

class MyBundleActivator {
public:
    explicit MyBundleActivator(const std::shared_ptr<celix::BundleContext>& ctx) {
        std::cout << "Hello world from bundle with id " << ctx->getBundleId() << std::endl;
    }

    ~MyBundleActivator() noexcept {
        std::cout << "Goodbye world" << std::endl;
    }
};

CELIX_GEN_CXX_BUNDLE_ACTIVATOR(MyBundleActivator)
#CMakeLists.txt
find_package(Celix REQUIRED)

add_celix_bundle(MyBundle
    SOURCES src/MyBundleActivator.cc
)

add_celix_container(MyContainer
    BUNDLES
        Celix::ShellCxx
        Celix::shell_tui
        MyBundle
)
#bash
#goto project dir
cd cmake-build-debug #assuming clion cmake-build-debug dir
cd deploy/MyContainer
./MyContainer
#Celix shell
-> lb -a
#list of all installed bundles
-> help
#list of all available Celix shell commands
-> help celix::lb
#Help info about the shell command `celix::lb`
-> stop 3
#stops MyBundle
-> start 3
#starts MyBundle
-> stop 0 
#stops the Celix framework

Register a service

In the Celix framework, a service is a C++ object or C struct registered in the Celix framework service registry under one interface together with properties (meta information). Services can be discovered and used by bundles.

//include/ICalc.h
#pragma once
class ICalc {
public:
    virtual ~ICalc() noexcept = default;
    virtual int add(int a, int b) = 0;
};
//src/CalcProviderBundleActivator.cc
#include "ICalc.h"
#include "celix/BundleActivator.h"

class CalcProvider : public ICalc {
public:
    ~CalcProvider() noexcept override = default;
    int add(int a, int b) override { return a + b; }
};

class CalcProviderBundleActivator {
public:
    explicit CalcProviderBundleActivator(const std::shared_ptr<celix::BundleContext>& ctx) {
        reg = ctx->registerService<ICalc>(std::make_shared<CalcProvider>())
                .build();
    }
private:
    std::shared_ptr<celix::ServiceRegistration> reg{};
};

CELIX_GEN_CXX_BUNDLE_ACTIVATOR(CalcProviderBundleActivator)
#CMakeLists.txt
find_package(Celix REQUIRED)

add_celix_bundle(CalcProviderBundle
    SOURCES src/CalcProviderBundleActivator.cc
)
target_include_directories(CalcProviderBundle PRIVATE include)

add_celix_container(CalcProviderContainer
    BUNDLES
        Celix::ShellCxx
        Celix::shell_tui
        CalcProviderBundle
)
#bash
#goto project dir
cd cmake-build-debug #assuming clion cmake-build-debug dir
cd deploy/CalcProviderBundle
./CalcProviderBundle

Use a service (ad hoc)

//include/ICalc.h
#pragma once
class ICalc {
public:
    virtual ~ICalc() noexcept = default;
    virtual int add(int a, int b) = 0;
};
//src/CalcUserBundleActivator.cc
#include <iostream>
#include "ICalc.h"
#include "celix/BundleActivator.h"

class CalcUserBundleActivator {
public:
    explicit CalcUserBundleActivator(const std::shared_ptr<celix::BundleContext>& ctx) {
        ctx->useService<ICalc>()
            .addUseCallback([](ICalc& calc) {
                std::cout << "result is " << calc.add(2, 3) << std::endl;
            })
            .setTimeout(std::chrono::seconds{1}) //wait for 1 second if a service is not directly found
            .build();
    }
};

CELIX_GEN_CXX_BUNDLE_ACTIVATOR(CalcUserBundleActivator)
#CMakeLists.txt
find_package(Celix REQUIRED)

add_celix_bundle(CalcUserBundle
    SOURCES src/CalcUserBundleActivator.cc
)
target_include_directories(CalcUserBundle PRIVATE include)

add_celix_container(CalcUserContainer
    BUNDLES
        Celix::ShellCxx
        Celix::shell_tui
        CalcProviderBundle
        CalcUserBundle
)
#bash
#goto project dir
cd cmake-build-debug #assuming clion cmake-build-debug dir
cd deploy/CalcUserContainer
./CalcUserContainer

Track services

//include/ICalc.h
#pragma once
class ICalc {
public:
    virtual ~ICalc() noexcept = default;
    virtual int add(int a, int b) = 0;
};
//src/CalcTrackerBundleActivator.cc
#include <mutex>
#include "ICalc.h"
#include "celix/BundleActivator.h"

class CalcTrackerBundleActivator {
public:
    explicit CalcTrackerBundleActivator(const std::shared_ptr<celix::BundleContext>& ctx) {
        tracker = ctx->trackServices<ICalc>()
            .build();
        for (auto& calc : tracker->getServices()) {
            std::cout << "result is " << std::to_string(calc->add(2, 3)) << std::endl;
        }
    }
    
private:
    std::shared_ptr<celix::ServiceTracker<ICalc>> tracker{};
};

CELIX_GEN_CXX_BUNDLE_ACTIVATOR(CalcTrackerBundleActivator)
find_package(Celix REQUIRED)

add_celix_bundle(CalcTrackerBundle
    SOURCES src/CalcTrackerBundleActivator.cc
)
target_include_directories(CalcTrackerBundle PRIVATE include)

add_celix_container(CalcTrackerContainer
    BUNDLES
        Celix::ShellCxx
        Celix::shell_tui
        CalcProviderBundle
        CalcTrackerBundle
)
#bash
#goto project dir
cd cmake-build-debug #assuming clion cmake-build-debug dir
cd deploy/CalcTrackerContainer
./CalcTrackerContainer

Service properties and filters

//src/FilterExampleBundleActivator.cc
#include <iostream>
#include "celix/BundleActivator.h"
#include "celix/IShellCommand.h"

class HelloWorldShellCommand : public celix::IShellCommand {
public:
    void executeCommand(const std::string& /*commandLine*/, const std::vector<std::string>& /*commandArgs*/, FILE* outStream, FILE* /*errorStream*/) {
        fprintf(outStream, "Hello World\n");
    }
};

class FilterExampleBundleActivator {
public:
    explicit FilterExampleBundleActivator(const std::shared_ptr<celix::BundleContext>& ctx) {
        auto reg1 = ctx->registerService<celix::IShellCommand>(std::make_shared<HelloWorldShellCommand>())
                .addProperty(celix::IShellCommand::COMMAND_NAME, "command1")
                .build();
        auto reg2 = ctx->registerService<celix::IShellCommand>(std::make_shared<HelloWorldShellCommand>())
                .addProperty(celix::IShellCommand::COMMAND_NAME, "command2")
                .build();
        regs.push_back(reg1);
        regs.push_back(reg2);
        
        auto serviceIdsNoFilter  = ctx->findServices<celix::IShellCommand>();
        auto serviceIdsWithFilter = ctx->findServices<celix::IShellCommand>(std::string{"("} + celix::IShellCommand::COMMAND_NAME + "=" + "command1)");
        std::cout << "Found " << std::to_string(serviceIdsNoFilter.size()) << " IShelLCommand services and found ";
        std::cout << std::to_string(serviceIdsWithFilter.size()) << " IShellCommand service with name command1" << std::endl;
    }
private:
    std::vector<std::shared_ptr<celix::ServiceRegistration>> regs{};
};

CELIX_GEN_CXX_BUNDLE_ACTIVATOR(FilterExampleBundleActivator)
#CMakeLists.txt
find_package(Celix REQUIRED)

add_celix_bundle(FilterExampleBundle
    SOURCES src/FilterExampleBundleActivator.cc
)
target_link_libraries(FilterExampleBundle PRIVATE Celix::shell_api) #adds celix/IShellCommand.h to the include path

add_celix_container(FilterExampleContainer
    BUNDLES
        Celix::ShellCxx
        Celix::shell_tui
        FilterExampleBundle
)
#bash
#goto project dir
cd cmake-build-debug #assuming clion cmake-build-debug dir
cd deploy/FilterExampleContainer
./FilterExampleContainer
#Celix shell
-> command1
-> command2
-> help

celix's People

Contributors

abroekhuis avatar bakkerv avatar bpetri avatar dhbfischer avatar ealanrian avatar erjanaltena avatar fredster33 avatar gabrielericciardi avatar idzardh avatar jermus67 avatar michielbouwhuis avatar noek1993 avatar oipo avatar pengzheng avatar pnoltes avatar rbulter avatar rlenferink avatar stegemr avatar tira-misu avatar troepje avatar unitink72 avatar wanglzh avatar was1840 avatar xuzhenbao avatar

Recommend Projects

  • React photo React

    A declarative, efficient, and flexible JavaScript library for building user interfaces.

  • Vue.js photo Vue.js

    ๐Ÿ–– Vue.js is a progressive, incrementally-adoptable JavaScript framework for building UI on the web.

  • Typescript photo Typescript

    TypeScript is a superset of JavaScript that compiles to clean JavaScript output.

  • TensorFlow photo TensorFlow

    An Open Source Machine Learning Framework for Everyone

  • Django photo Django

    The Web framework for perfectionists with deadlines.

  • D3 photo D3

    Bring data to life with SVG, Canvas and HTML. ๐Ÿ“Š๐Ÿ“ˆ๐ŸŽ‰

Recommend Topics

  • javascript

    JavaScript (JS) is a lightweight interpreted programming language with first-class functions.

  • web

    Some thing interesting about web. New door for the world.

  • server

    A server is a program made to process requests and deliver data to clients.

  • Machine learning

    Machine learning is a way of modeling and interpreting data that allows a piece of software to respond intelligently.

  • Game

    Some thing interesting about game, make everyone happy.

Recommend Org

  • Facebook photo Facebook

    We are working to build community through open source technology. NB: members must have two-factor auth.

  • Microsoft photo Microsoft

    Open source projects and samples from Microsoft.

  • Google photo Google

    Google โค๏ธ Open Source for everyone.

  • D3 photo D3

    Data-Driven Documents codes.