AWS 插件扩展开发参考指南

缓存排序示例

Cache默认提供的迭代器返回无序的结果，如

Iterator<BookModel> iterator = BookCache.getCache().iterator();

AWS Cache对查询全部缓存和索引缓存支持Comparator（排序比较器），开发者可以通过自定义的排序比较器获得有序的Iterator结果。

按书名排序比较

com.actionsoft.apps.poc.plugin.cache.BookCache#SORT_BOOK_NAME

private static Comparator<BookModel> SORT_BOOK_NAME = new Comparator<BookModel>() {
    public int compare(BookModel o1, BookModel o2) {
        if (o1 == null || o2 == null) {
            return 0;
        }
        return o1.getName().compareTo(o2.getName());
    }
};

按图书数量排序比较

com.actionsoft.apps.poc.plugin.cache.BookCache#SORT_BOOK_QUANTITY

private static Comparator<BookModel> SORT_BOOK_QUANTITY = new Comparator<BookModel>() {
    public int compare(BookModel o1, BookModel o2) {
        if (o1 == null || o2 == null) {
            return 0;
        }

        return o1.getQuantity() - o2.getQuantity();
    }
};

排序在BookCache中封装

• getByIndex，适用于排序CacheIndex索引的缓存对象
• iteratorSorted，适用于排序Cache的全部缓存对象

com.actionsoft.apps.poc.plugin.cache.BookCache

/**
 * 排序示例。按图书名排序索引的结果
 *
 * @param year
 * @return
 */
public static Iterator<BookModel> listSortByName(int year) {
    return getCache().getByIndex(BookIndex2.class, Integer.toString(year), SORT_BOOK_NAME);
}

/**
 * 排序示例。按图书库存量排序全部缓存
 *
 * @return
 */
public static Iterator<BookModel> listSortByQuantity() {
    return getCache().iteratorSorted(SORT_BOOK_QUANTITY);
}

验证

进入AWS CONSOLE > 应用管理并打开你的应用，在部署中点击CacheSample，在弹出的对话框中点击排序示例按钮，你会看到页面返回如下类似信息

对话框部分的代码示例

com.actionsoft.apps.poc.plugin.web.SampleWeb#getCacheSampleHome3

public String getCacheSampleHome3() {
    StringBuilder data = new StringBuilder();
    data.append("<b>BookCache ==> SORT_BOOK_NAME/SORT_BOOK_QUANTITY</b><hr>\n");
    Iterator<BookModel> iterator = BookCache.listSortByName(2014);
    data.append("<b>SORT_BOOK_NAME/BookCache.listSortByName(2014)</b><br/>");
    while (iterator.hasNext()) {
        BookModel bookModel = iterator.next();
        data.append(bookModel.getName()).append(" ==> ").append(bookModel.toJson()).append("<br/>");
    }
    iterator = BookCache.listSortByQuantity();
    data.append("<b>SORT_BOOK_QUANTITY/BookCache.listSortByQuantity()</b><br/>");
    while (iterator.hasNext()) {
        BookModel bookModel = iterator.next();
        data.append(bookModel.getQuantity()).append(" ==> ").append(bookModel.toJson()).append("<br/>");
    }
    Map<String, Object> macroLibraries = new LinkedHashMap<String, Object>();
    macroLibraries.put("data", data.toString());
    macroLibraries.put("sid", getContext().getSessionId());
    return HtmlPageTemplate.merge("com.actionsoft.apps.poc.plugin", "cache-sample-dialog.htm", macroLibraries);
}