synchronization

问题 I have a usecase where I have to insert a new value if the key does not exist in the ConcurrentHashMap replace the old value with a new value if the key already exists in the ConcurrentHashMap, where the new value is derived from the old value (not an expensive operation) I've the following code to offer: public void insertOrReplace(String key, String value) { boolean updated = false; do { String oldValue = concurrentMap.get(key); if (oldValue == null) { oldValue = concurrentMap.putIfAbsent

问题 I have a usecase where I have to insert a new value if the key does not exist in the ConcurrentHashMap replace the old value with a new value if the key already exists in the ConcurrentHashMap, where the new value is derived from the old value (not an expensive operation) I've the following code to offer: public void insertOrReplace(String key, String value) { boolean updated = false; do { String oldValue = concurrentMap.get(key); if (oldValue == null) { oldValue = concurrentMap.putIfAbsent

问题 I was wondering whenever exists a solution to perform synchronization in JavaScript code. For example I have the following case: I'm trying to cache some response values from AJAX call, the problem is, that it's possible to perform simultaneously several calls, therefore it leads to race condition in the code. So I'm very curious to find solution for that? Any one has idea that to do? 回答1: I can offer a possible solution, but without seeing the code ... not completely sure what you are doing,

问题 I was wondering whenever exists a solution to perform synchronization in JavaScript code. For example I have the following case: I'm trying to cache some response values from AJAX call, the problem is, that it's possible to perform simultaneously several calls, therefore it leads to race condition in the code. So I'm very curious to find solution for that? Any one has idea that to do? 回答1: I can offer a possible solution, but without seeing the code ... not completely sure what you are doing,

问题 I know this question has been asked and answered many times before, but I just couldn't figure out a trick on the examples found around internet, like this or that one. Both of these solutions check for emptiness of the blocking queue's array/queue/linkedlist to notifyAll waiting threads in put() method and vice versa in get() methods. A comment in the second link emphasizes this situation and mentions that that's not necessary. So the question is; It also seems a bit odd to me to check

问题 I have two computers, a desktop and a laptop. Now I have set up my ENV to sync with the help of a dropbox link. Is there a way to sync my Sublime Text 3 settings between these two computers including all my plugins, preference files, etc... and, if so, how can I set things up to sync properly? 回答1: I am assuming you are using Package Control for managing your plugins. What to Sync Both a list of your packages as well as all of your settings files are all contained within your Packages/User/

问题 I have two computers, a desktop and a laptop. Now I have set up my ENV to sync with the help of a dropbox link. Is there a way to sync my Sublime Text 3 settings between these two computers including all my plugins, preference files, etc... and, if so, how can I set things up to sync properly? 回答1: I am assuming you are using Package Control for managing your plugins. What to Sync Both a list of your packages as well as all of your settings files are all contained within your Packages/User/

问题 I've a server/client architecture implemented, where all state changes are sent to the function, validated and broadcasted to all clients connected. This works rather well, but the system does not maintain synchronization between the client instances of the game as of now. If there happened to be a 5 second lag between the server and a particular client then he would receive the state change 5 seconds after the rest of the clients thus leaving him with game state out of sync. I've been

问题 I'm in the middle of brainstorming a cloud sync solution for a Core Data app that I am currently developing. I'm planning to open source the code for this once its done, for anyone to use with their Core Data apps, so input from the community on how this system should work is much appreciated :-) Here's what I'm thinking: Server Side Storage Provider As with all cloud sync systems, storage is a major piece of the puzzle. There are many ways to handle this. I could set up my own server for

问题 I'm in the middle of brainstorming a cloud sync solution for a Core Data app that I am currently developing. I'm planning to open source the code for this once its done, for anyone to use with their Core Data apps, so input from the community on how this system should work is much appreciated :-) Here's what I'm thinking: Server Side Storage Provider As with all cloud sync systems, storage is a major piece of the puzzle. There are many ways to handle this. I could set up my own server for