mirror of
https://gitee.com/acl-dev/acl.git
synced 2024-12-15 17:30:53 +08:00
265 lines
4.8 KiB
C++
265 lines
4.8 KiB
C++
#include "stdafx.h"
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#if !defined(_WIN32) && !defined(_WIN64)
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#include <sys/time.h>
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#endif
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/**
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* dbuf_obj 子类,在 dbuf_pool 上动态分配,由 dbuf_guard 统一进行管理
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*/
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class myobj : public acl::dbuf_obj
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{
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public:
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myobj(acl::dbuf_guard* guard = NULL) : dbuf_obj(guard)
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{
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ptr_ = strdup("hello");
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}
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void run()
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{
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printf("----> run->hello world <-----\r\n");
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}
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private:
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char* ptr_;
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// 将析构声明为私人,以强制要求该对象被动态分配,该析构函数将由
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// dbuf_guard 统一调用,以释放本类对象中产生的动态内存(ptr_)
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~myobj()
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{
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free(ptr_);
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}
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};
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static void test_dbuf(acl::dbuf_guard& dbuf)
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{
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for (int i = 0; i < 102400; i++)
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{
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// 动态分配内存
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char* ptr = (char*) dbuf.dbuf_alloc(10);
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(void) ptr;
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}
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for (int i = 0; i < 102400; i++)
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{
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// 动态分配字符串
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char* str = dbuf.dbuf_strdup("hello world");
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if (i < 5)
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printf(">>str->%s\r\n", str);
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}
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// 动态分配内存
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(void) dbuf.dbuf_alloc(1024);
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(void) dbuf.dbuf_alloc(1024);
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(void) dbuf.dbuf_alloc(2048);
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(void) dbuf.dbuf_alloc(1024);
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(void) dbuf.dbuf_alloc(1024);
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(void) dbuf.dbuf_alloc(1024);
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(void) dbuf.dbuf_alloc(1024);
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(void) dbuf.dbuf_alloc(1024);
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(void) dbuf.dbuf_alloc(1024);
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(void) dbuf.dbuf_alloc(1024);
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(void) dbuf.dbuf_alloc(1024);
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(void) dbuf.dbuf_alloc(10240);
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for (int i = 0; i < 10000; i++)
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{
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// 动态分配 dbuf_obj 子类对象,并通过将 dbuf_guard 对象传入
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// dbuf_obj 的构造函数,从而将之由 dbuf_guard 统一管理,
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myobj* obj = dbuf.create<myobj>(&dbuf);
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// 验证 dbuf_obj 对象在 dbuf_guard 中的在在一致性
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assert(obj == dbuf[obj->pos()]);
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// 调用 dbuf_obj 子类对象 myobj 的函数 run
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if (i < 10)
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obj->run();
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}
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for (int i = 0; i < 10000; i++)
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{
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myobj* obj = dbuf.create<myobj>();
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assert(dbuf[obj->pos()] == obj);
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if (i < 10)
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obj->run();
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}
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for (int i = 0; i < 10000; i++)
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{
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myobj* obj = dbuf.create<myobj>(&dbuf);
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// 虽然多次将 dbuf_obj 对象置入 dbuf_guard 中,因为 dbuf_obj
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// 内部的引用计数,所以可以防止被重复添加
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(void) dbuf.push_back(obj);
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(void) dbuf.push_back(obj);
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(void) dbuf.push_back(obj);
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assert(obj == dbuf[obj->pos()]);
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if (i < 10)
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obj->run();
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}
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}
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static void wait_pause()
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{
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printf("Enter any key to continue ...");
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fflush(stdout);
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getchar();
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}
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static void test1()
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{
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// dbuf_gaurd 对象创建在栈上,函数返回前该对象自动销毁
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acl::dbuf_guard dbuf;
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test_dbuf(dbuf);
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}
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static void test2()
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{
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// 动态创建 dbuf_guard 对象,需要手动销毁该对象
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acl::dbuf_guard* dbuf = new acl::dbuf_guard;
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test_dbuf(*dbuf);
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// 手工销毁该对象
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delete dbuf;
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}
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static void test3()
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{
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// 将内存池对象 dbuf_pool 做为 dbuf_guard 构造函数参数传入,当
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// dbuf_guard 对象销毁时,dbuf_pool 对象一同被销毁
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acl::dbuf_guard dbuf(new acl::dbuf_pool);
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test_dbuf(dbuf);
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}
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static void test4()
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{
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// 动态创建 dbuf_guard 对象,同时指定内存池中内存块的分配倍数为 10,
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// 即指定内部每个内存块大小为 4096 * 10 = 40 KB,同时
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// 指定内部动态数组的初始容量大小
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acl::dbuf_guard dbuf(10, 100);
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test_dbuf(dbuf);
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}
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static void test5()
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{
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acl::dbuf_pool* dp = new acl::dbuf_pool;
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// 在内存池对象上动态创建 dbuf_guard 对象,这样可以将内存分配的次数
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// 进一步减少一次
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acl::dbuf_guard* dbuf = new (dp->dbuf_alloc(sizeof(acl::dbuf_guard)))
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acl::dbuf_guard(dp);
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test_dbuf(*dbuf);
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// 因为 dbuf_gaurd 对象也是在 dbuf_pool 内存池对象上动态创建的,所以
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// 只能通过直接调用 dbuf_guard 的析构函数来释放所有的内存对象;
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// 既不能直接 dbuf_pool->desotry(),也不能直接 delete dbuf_guard 来
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// 销毁 dbuf_guard 对象
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dbuf->~dbuf_guard();
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}
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class myobj2 : public acl::dbuf_obj
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{
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public:
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myobj2() {}
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void run()
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{
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printf("hello world\r\n");
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}
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private:
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~myobj2() {}
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};
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class myobj3 : public acl::dbuf_obj
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{
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public:
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myobj3(int i) : i_(i) {}
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void run()
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{
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printf("hello world: %d\r\n", i_);
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}
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private:
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~myobj3() {}
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private:
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int i_;
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};
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class myobj_dummy // : public acl::dbuf_obj
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{
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public:
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myobj_dummy() {}
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void run()
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{
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printf("can't be compiled\r\n");
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}
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private:
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~myobj_dummy() {}
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};
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static void test6()
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{
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acl::dbuf_guard dbuf;
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myobj* o = dbuf.create<myobj>();
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o->run();
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myobj* o1 = dbuf.create<myobj>(&dbuf);
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o1->run();
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myobj2* o2 = dbuf.create<myobj2>();
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o2->run();
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myobj3* o3 = dbuf.create<myobj3>(10);
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o3->run();
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for (int i = 0; i < 10; i++)
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{
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myobj3* o4 = dbuf.create<myobj3>(i);
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o4->run();
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}
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// below codes can't be compiled, because myobj_dummy isn't
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// acl::dbuf_obj's subclass
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// myobj_dummy* dummy = dbuf.create<myobj_dummy>();
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// dummy->run();
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}
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int main(void)
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{
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acl::log::stdout_open(true);
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test1();
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wait_pause();
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test2();
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wait_pause();
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test3();
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wait_pause();
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test4();
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wait_pause();
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test5();
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wait_pause();
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test6();
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return 0;
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}
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