Examples of java.util.concurrent.CompletionService

java.util.concurrent.CompletionService
A service that decouples the production of new asynchronous tasks from the consumption of the results of completed tasks. Producers submit tasks for execution. Consumers take completed tasks and process their results in the order they complete. A CompletionService can for example be used to manage asynchronous IO, in which tasks that perform reads are submitted in one part of a program or system, and then acted upon in a different part of the program when the reads complete, possibly in a different order than they were requested.
Typically, a CompletionService relies on a separate {@link Executor} to actually execute the tasks, in which case theCompletionService only manages an internal completion queue. The {@link ExecutorCompletionService} class provides animplementation of this approach.
Memory consistency effects: Actions in a thread prior to submitting a task to a {@code CompletionService}happen-before actions taken by that task, which in turn happen-before actions following a successful return from the corresponding {@code take()}.


            final DocumentFactory documentFactory = new DocumentFactory(basedir, buildMapping(), buildHeaderDefinitions(), encoding, keywords);


            int nThreads = (int) (Runtime.getRuntime().availableProcessors() * concurrencyFactor);
            ExecutorService executorService = Executors.newFixedThreadPool(nThreads);
            CompletionService completionService = new ExecutorCompletionService(executorService);
            int count = 0;
            debug("Number of execution threads: %s", nThreads);


            try {
                for (final String file : listSelectedFiles()) {
                    completionService.submit(new Runnable() {
                        public void run() {
                            Document document = documentFactory.createDocuments(file);
                            debug("Selected file: %s [header style: %s]", document.getFile(), document.getHeaderDefinition());
                            if (document.isNotSupported()) {
                                warn("Unknown file extension: %s", document.getFile());
                            } else if (document.is(h)) {
                                debug("Skipping header file: %s", document.getFile());
                            } else if (document.hasHeader(h, strictCheck)) {
                                callback.onExistingHeader(document, h);
                            } else {
                                boolean headerFound = false;
                                for (Header validHeader : validHeaders) {
                                    if (headerFound = document.hasHeader(validHeader, strictCheck)) {
                                        callback.onExistingHeader(document, h);
                                        break;
                                    }
                                }
                                if (!headerFound)
                                    callback.onHeaderNotFound(document, h);
                            }
                        }
                    }, null);
                    count++;
                }


                while (count-- > 0) {
                    try {
                        completionService.take().get();
                    } catch (InterruptedException e) {
                        Thread.currentThread().interrupt();
                    } catch (ExecutionException e) {
                        Throwable cause = e.getCause();
                        if (cause instanceof Error)

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            final DocumentFactory documentFactory = new DocumentFactory(basedir, buildMapping(), buildHeaderDefinitions(), encoding, keywords);


            int nThreads = (int) (Runtime.getRuntime().availableProcessors() * concurrencyFactor);
            ExecutorService executorService = Executors.newFixedThreadPool(nThreads);
            CompletionService completionService = new ExecutorCompletionService(executorService);
            int count = 0;
            debug("Number of execution threads: %s", nThreads);


            try {
                for (final String file : listSelectedFiles()) {
                    completionService.submit(new Runnable() {
                        public void run() {
                            Document document = documentFactory.createDocuments(file);
                            debug("Selected file: %s [header style: %s]", document.getFile(), document.getHeaderDefinition());
                            if (document.isNotSupported()) {
                                warn("Unknown file extension: %s", document.getFile());
                            } else if (document.is(h)) {
                                debug("Skipping header file: %s", document.getFile());
                            } else if (document.hasHeader(h, strictCheck)) {
                                callback.onExistingHeader(document, h);
                            } else {
                                boolean headerFound = false;
                                for (Header validHeader : validHeaders) {
                                    if (headerFound = document.hasHeader(validHeader, strictCheck)) {
                                        callback.onExistingHeader(document, h);
                                        break;
                                    }
                                }
                                if (!headerFound)
                                    callback.onHeaderNotFound(document, h);
                            }
                        }
                    }, null);
                    count++;
                }


                while (count-- > 0) {
                    try {
                        completionService.take().get();
                    } catch (InterruptedException e) {
                        Thread.currentThread().interrupt();
                    } catch (ExecutionException e) {
                        Throwable cause = e.getCause();
                        if (cause instanceof Error)

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 * @author Service Platform Architecture Team (spat@58.com)
 */
public class ExecuteLearn {


    public void testFuture() {
        CompletionService cs ;
        Future future;
        FutureTask ft;


    }

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