threadpoolexecutor

问题 I was looking at the ThreadPoolExecutor class and I found that it allows to specify the maximum pool size and the core pool size. I understand, a little, about when to change the core and maximum pool sizes based on the answer here: When is specifying separate core and maximum pool sizes in ThreadPoolExecutor a good idea? However, I would like to know what are these 'core threads'. I always get 0 when I use the getCorePoolSize() method of a ThreadPoolExecutor SSCCE here: import java.util

问题 I was looking at the ThreadPoolExecutor class and I found that it allows to specify the maximum pool size and the core pool size. I understand, a little, about when to change the core and maximum pool sizes based on the answer here: When is specifying separate core and maximum pool sizes in ThreadPoolExecutor a good idea? However, I would like to know what are these 'core threads'. I always get 0 when I use the getCorePoolSize() method of a ThreadPoolExecutor SSCCE here: import java.util

问题 I've been frustrated for some time with the default behavior of ThreadPoolExecutor which backs the ExecutorService thread-pools that so many of us use. To quote from the Javadocs: If there are more than corePoolSize but less than maximumPoolSize threads running, a new thread will be created only if the queue is full . What this means is that if you define a thread pool with the following code, it will never start the 2nd thread because the LinkedBlockingQueue is unbounded. ExecutorService

问题 Is their a way to schedule a thread pool using ExecutorService , in lines similar to thread.sleep() My current code looks something like Executors.newScheduledThreadPool(poolSize); public void run() { try { pool.execute(new Worker()); } But I want to call the run method, only after some time interval. Can someone let me know how to do this? 回答1: This can be achieved using ScheduledThreadPoolExecutor. Sample code pool = new ScheduledThreadPoolExecutor(10); pool.scheduleWithFixedDelay(new

问题 The application conduction api calls in every 10seconds with the gps location from the network provider. And also there are several api calls can be do by the user. application is crashing with law internet or less internet connection(device data access) is there a proper way to prevent app crashing and hold the api request till the internet network available. here im posting my crash reprort stacktrace java.util.concurrent.RejectedExecutionException: Task android.os.AsyncTask$3@4206a5b0

问题 The application conduction api calls in every 10seconds with the gps location from the network provider. And also there are several api calls can be do by the user. application is crashing with law internet or less internet connection(device data access) is there a proper way to prevent app crashing and hold the api request till the internet network available. here im posting my crash reprort stacktrace java.util.concurrent.RejectedExecutionException: Task android.os.AsyncTask$3@4206a5b0

问题 I have List of N items and I want to divide this List in a sequential manner between a fixed number of threads . By sequential I mean, I want to pass 1 to N/4 to first thread , N/4 + 1 to N/2 to second thread and N/2+1 to N to third thread , Now once all the threads have finished their work, I want to notify to main thread to send some message that all the processing has been completed. What I have done so far now is that I have implemented ExecutorService I did something like this

问题 I need to build a pool of workers in Java where each worker has its own connected socket; when the worker thread runs, it uses the socket but keeps it open to reuse later. We decided on this approach because the overhead associated with creating, connecting, and destroying sockets on an ad-hoc basis required too much overhead, so we need a method by which a pool of workers are pre-initializaed with their socket connection, ready to take on work while keeping the socket resources safe from

问题 I am trying to start an existing project from the main class. But getting the exception below. java.lang.UnsatisfiedLinkError: Could not load library. Reasons: [no leveldbjni64-1.8 in java.library.path, no leveldbjni-1.8 in java.library.path, no leveldbjni in java.library.path, C:\Users\Z003SXSP\AppData\Local\Temp\leveldbjni-64-1-386410980806513791.8: Can't find dependent libraries] But when I tried running the same project from other machine, I am able to run it successfully also found

问题 I am trying to start an existing project from the main class. But getting the exception below. java.lang.UnsatisfiedLinkError: Could not load library. Reasons: [no leveldbjni64-1.8 in java.library.path, no leveldbjni-1.8 in java.library.path, no leveldbjni in java.library.path, C:\Users\Z003SXSP\AppData\Local\Temp\leveldbjni-64-1-386410980806513791.8: Can't find dependent libraries] But when I tried running the same project from other machine, I am able to run it successfully also found