高效同步资源

GET /calendars/primary/events?maxResults=10&singleEvents=true&syncToken=CPDAlvWDx70CEPDAlvWDx

// Result contains the following

"nextPageToken":"CiAKGjBpNDd2Nmp2Zml2cXRwYjBpOXA",

GET /calendars/primary/events?maxResults=10&singleEvents=true&syncToken=CPDAlvWDx70CEPDAlvWDx&pageToken=CiAKGjBpNDd2Nmp2Zml2cXRwYjBpOXA

  private static void run() throws IOException {
    // Construct the {@link Calendar.Events.List} request, but don't execute it yet.
    Calendar.Events.List request = client.events().list("primary");

    // Load the sync token stored from the last execution, if any.
    String syncToken = syncSettingsDataStore.get(SYNC_TOKEN_KEY);
    if (syncToken == null) {
      System.out.println("Performing full sync.");

      // Set the filters you want to use during the full sync. Sync tokens aren't compatible with
      // most filters, but you may want to limit your full sync to only a certain date range.
      // In this example we are only syncing events up to a year old.
      Date oneYearAgo = Utils.getRelativeDate(java.util.Calendar.YEAR, -1);
      request.setTimeMin(new DateTime(oneYearAgo, TimeZone.getTimeZone("UTC")));
    } else {
      System.out.println("Performing incremental sync.");
      request.setSyncToken(syncToken);
    }

    // Retrieve the events, one page at a time.
    String pageToken = null;
    Events events = null;
    do {
      request.setPageToken(pageToken);

      try {
        events = request.execute();
      } catch (GoogleJsonResponseException e) {
        if (e.getStatusCode() == 410) {
          // A 410 status code, "Gone", indicates that the sync token is invalid.
          System.out.println("Invalid sync token, clearing event store and re-syncing.");
          syncSettingsDataStore.delete(SYNC_TOKEN_KEY);
          eventDataStore.clear();
          run();
        } else {
          throw e;
        }
      }

      List<Event> items = events.getItems();
      if (items.size() == 0) {
        System.out.println("No new events to sync.");
      } else {
        for (Event event : items) {
          syncEvent(event);
        }
      }

      pageToken = events.getNextPageToken();
    } while (pageToken != null);

    // Store the sync token from the last request to be used during the next execution.
    syncSettingsDataStore.set(SYNC_TOKEN_KEY, events.getNextSyncToken());

    System.out.println("Sync complete.");
  }
SyncTokenSample.java