java頻繁的new對象 優化方案

import java.io.Serializable;
import java.util.Collection;
import java.util.concurrent.Callable;

import org.springframework.web.context.request.async.WebAsyncTask;

import com.github.miemiedev.mybatis.paginator.domain.PageList; /**
 * 對於將會頻繁創建的對象，我們要讓這個類實現Cloneable接口,通過getInstance()函數處理獲取對象
 * clone的最大特點就是，不會去調用任何構造方法,提高很多頻繁new對象產生的時耗
 * 
 * @作者 light-zhang
 * @時間 2018年8月16日 
 * @file WebAsyncSupport.java
 *
 */
public final class WebAsyncSupport implements Serializable, Cloneable {

    private static final long serialVersionUID = -1642396555652972191L;

    private static WebAsyncSupport support = new WebAsyncSupport();

    private WebAsyncSupport() {
        super();
    }

    /**
     * 調用對象創建優化
     * 
     * @return
     */
    public static WebAsyncSupport getInstance() {
        try {
            return (WebAsyncSupport) support.clone();
        } catch (CloneNotSupportedException e) {
            e.printStackTrace();
        }
        return new WebAsyncSupport();
    }

    /**
     * 分頁參數處理
     * 
     * @param items
     * @param containsTotalCount
     * @return
     */
    public WebAsyncTask<ReturnMsg> asyncPageList(Collection<?> items, boolean containsTotalCount) {
        ReturnMsg m = null;
        m = ReturnMsg.getPage("SUCCESS", HttpStatusCode.OK, items, null);
        if (containsTotalCount) {// 使用containsTotalCount來決定查不查詢totalCount，即返回ArrayList還是PageList
            @SuppressWarnings("unchecked")
            final PageList<Object> pageData = (PageList<Object>) items;
            if (!validateListNull(pageData)) {
                m = ReturnMsg.getPage("SUCCESS", HttpStatusCode.OK, pageData, pageData.getPaginator());
            }
        }
        return this.getWebAsyncTask(m);
    }

    /**
     * 異步任務處理
     * 
     * @param m
     * @return
     */
    public WebAsyncTask<ReturnMsg> getWebAsyncTask(ReturnMsg m) {
        return new WebAsyncTask<ReturnMsg>(1000, new Callable<ReturnMsg>() {
            @Override
            public ReturnMsg call() throws Exception {
                return m;
            }
        });
    }

    /**
     * 驗證數組參數
     * 
     * @param list
     * @return
     */
    public static boolean validateListNull(Collection<?> list) {
        return (list == null || list.isEmpty()) ? true : false;
    }
}