private static void Test2() {
Console.WriteLine("########## Test 2 #########");
var my_cache = new MyCache(); // 共享资源：缓存
var tasks = new List<Task>(); // 共享资源访问者：线程
// 待读者写入缓存的数据
String[] dot_net_knowledge_1 = { "C#", ".NET",
"IL", "assembly", "value_type",
"reference_type", "CLR",
"COM", "C++/CLI"};
String[] dot_net_knowledge_2 = {
"private", "protected",
"public", "internal", "abstract",
"sealed", "static",
"readonly", "virtual",
"new", "override",
"garbage_collection", "reference_counting"};
String[] dot_net_knowledge_3 = {
"interlocked", "Monitor", "Mutex",
"Semaphore", "AutoResetEvent",
"ManualResetEvent", "WaitAny",
"WaitAll", "Task",
"async", "await",
"LINQ", "ADO.NET",
"Entity Framework"};
int cnt_items = 0;
// int temp_cnt_items = 0;
// 3个写任务，会出现并发的写锁请求
tasks.Add(Task.Run(() => {
for (int ctr = 1; ctr <= dot_net_knowledge_1.Length; ctr++)
my_cache.Add(ctr, dot_net_knowledge_1[ctr - 1]);
// temp_cnt_items = dot_net_knowledge.Length;
cnt_items = dot_net_knowledge_1.Length;
Console.WriteLine("# TaskInfo: 写者 - Task id {0} - 向缓存写入 {1} 项",
Task.CurrentId, cnt_items);
}));
tasks.Add(Task.Run(() => {
for (int ctr = 1; ctr <= dot_net_knowledge_2.Length; ctr++)
my_cache.Add(dot_net_knowledge_1.Length + ctr, dot_net_knowledge_2[ctr - 1]);
// temp_cnt_items = dot_net_knowledge.Length;
cnt_items = dot_net_knowledge_2.Length;
Console.WriteLine("# TaskInfo: 写者 - Task id {0} - 向缓存写入 {1} 项",
Task.CurrentId, cnt_items);
}));
tasks.Add(Task.Run(() => {
for (int ctr = 1; ctr <= dot_net_knowledge_3.Length; ctr++)
my_cache.Add(dot_net_knowledge_1.Length + dot_net_knowledge_2.Length + ctr, dot_net_knowledge_3[ctr - 1]);
// temp_cnt_items = dot_net_knowledge.Length;
cnt_items = dot_net_knowledge_3.Length;
Console.WriteLine("# TaskInfo: 写者 - Task id {0} - 向缓存写入 {1} 项",
Task.CurrentId, cnt_items);
}));
// Wait for all tasks to complete.
Task.WaitAll(tasks.ToArray());
}
private static void Test1() {
Console.WriteLine("########## Test 1 #########");
var my_cache = new MyCache(); // 共享资源：缓存
var tasks = new List<Task>(); // 共享资源访问者：线程
// 待读者写入缓存的数据
String[] dot_net_knowledge = { "C#", ".NET",
"IL", "assembly", "value_type",
"reference_type", "CLR",
"COM", "C++/CLI",
"private", "protected",
"public", "internal", "abstract",
"sealed", "static",
"readonly", "virtual",
"new", "override",
"garbage_collection", "reference_counting",
"interlocked", "Monitor", "Mutex",
"Semaphore", "AutoResetEvent",
"ManualResetEvent", "WaitAny",
"WaitAll", "Task",
"async", "await",
"LINQ", "ADO.NET",
"Entity Framework"};
int cnt_items = 0;
// int temp_cnt_items = 0;
// 1个写任务，共需要获取写锁36次
tasks.Add(Task.Run(() => {
for (int ctr = 1; ctr <= dot_net_knowledge.Length; ctr++)
my_cache.Add(ctr, dot_net_knowledge[ctr - 1]);
// temp_cnt_items = dot_net_knowledge.Length;
cnt_items = dot_net_knowledge.Length;
Console.WriteLine("# TaskInfo: 写者 - Task id {0} - 向缓存写入 {1} 项",
Task.CurrentId, cnt_items);
}));
// 3个读任务，读取缓存中已有的全部数据。会获取读锁很多次，直到写任务写入完成，且三个读任务都读到了全部的缓存数据
for (int ctr = 0; ctr <= 2; ctr++) {
tasks.Add(Task.Run(() => {
int items;
do {
String output = String.Empty;
items = my_cache.Count;
for (int index = 1; index <= items; index++)
output += String.Format("[{0}] ", my_cache.Read(index));
if (items != 0)
Console.WriteLine("# TaskInfo: 读者 - Task id {0} - 读取 {1} 项: {2}",
Task.CurrentId, items, output);
} while (items < cnt_items | cnt_items == 0);
}));
}
// 一个可升级读任务，如果读到"Entity Framework"，则将其修改为"EF"
tasks.Add(Task.Run(() => {
Thread.Sleep(1000);
for (int ctr = 1; ctr <= my_cache.Count; ctr++) {
String value = my_cache.Read(ctr);
if (value == "Entity Framework")
if (my_cache.AddOrUpdate(ctr, "EF") != MyCache.AddOrUpdateStatus.Unchanged)
Console.WriteLine("# TaskInfo: Changed 'Entity Framework' to 'EF'");
}
}));
// Wait for all tasks to complete.
Task.WaitAll(tasks.ToArray());
}
