Examples with ListFolderLongpollResult com.dropbox.core.v2.files.ListFolderLongpollResult used on opensource projects

Example 1 with ListFolderLongpollResult

use of com.dropbox.core.v2.files.ListFolderLongpollResult in project dropbox-sdk-java by dropbox.

the class Main method longpoll.

/**
 * Will perform longpoll request for changes in the user's Dropbox
 * account and display those changes. This is more efficient that
 * periodic polling the endpoint.
 */
public static void longpoll(DbxAuthInfo auth, String path) throws IOException {
    long longpollTimeoutSecs = TimeUnit.MINUTES.toSeconds(2);
    // need 2 Dropbox clients for making calls:
    // 
    // (1) One for longpoll requests, with its read timeout set longer than our polling timeout
    // (2) One for all other requests, with its read timeout set to the default, shorter timeout
    // 
    StandardHttpRequestor.Config config = StandardHttpRequestor.Config.DEFAULT_INSTANCE;
    StandardHttpRequestor.Config longpollConfig = config.copy().withReadTimeout(5, TimeUnit.MINUTES).build();
    DbxClientV2 dbxClient = createClient(auth, config);
    DbxClientV2 dbxLongpollClient = createClient(auth, longpollConfig);
    try {
        // We only care about file changes, not existing files, so grab latest cursor for this
        // path and then longpoll for changes.
        String cursor = getLatestCursor(dbxClient, path);
        System.out.println("Longpolling for changes... press CTRL-C to exit.");
        while (true) {
            // will block for longpollTimeoutSecs or until a change is made in the folder
            ListFolderLongpollResult result = dbxLongpollClient.files().listFolderLongpoll(cursor, longpollTimeoutSecs);
            // we have changes, list them
            if (result.getChanges()) {
                cursor = printChanges(dbxClient, cursor);
            }
            // we were asked to back off from our polling, wait the requested amount of seconds
            // before issuing another longpoll request.
            Long backoff = result.getBackoff();
            if (backoff != null) {
                try {
                    System.out.printf("backing off for %d secs...\n", backoff.longValue());
                    Thread.sleep(TimeUnit.SECONDS.toMillis(backoff));
                } catch (InterruptedException ex) {
                    System.exit(0);
                }
            }
        }
    } catch (DbxApiException ex) {
        // if a user message is available, try using that instead
        String message = ex.getUserMessage() != null ? ex.getUserMessage().getText() : ex.getMessage();
        System.err.println("Error making API call: " + message);
        System.exit(1);
    } catch (NetworkIOException ex) {
        System.err.println("Error making API call: " + ex.getMessage());
        if (ex.getCause() instanceof SocketTimeoutException) {
            System.err.println("Consider increasing socket read timeout or decreasing longpoll timeout.");
        }
        System.exit(1);
    } catch (DbxException ex) {
        System.err.println("Error making API call: " + ex.getMessage());
        System.exit(1);
    }
}