webindex.data.fluo.PageLoader.java Source code

Introduction

Here is the source code for webindex.data.fluo.PageLoader.java

Source

/*
 * Copyright 2015 Webindex authors (see AUTHORS)
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
 * in compliance with the License. You may obtain a copy of the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software distributed under the License
 * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
 * or implied. See the License for the specific language governing permissions and limitations under
 * the License.
 */

package webindex.data.fluo;

import java.net.MalformedURLException;
import java.util.Objects;

import com.google.common.base.Preconditions;
import com.google.gson.Gson;
import org.apache.fluo.api.client.Loader;
import org.apache.fluo.api.client.TransactionBase;
import org.apache.fluo.recipes.core.data.RowHasher;
import org.apache.fluo.recipes.core.types.TypedTransactionBase;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import webindex.core.Constants;
import webindex.core.models.Page;
import webindex.core.models.URL;

public class PageLoader implements Loader {

    private static final Logger log = LoggerFactory.getLogger(PageLoader.class);
    private Action action;
    private Page page;
    private URL delUrl;

    private PageLoader() {
    }

    public static PageLoader updatePage(Page page) {
        Preconditions.checkArgument(!page.isEmpty(), "Page cannot be empty");
        PageLoader update = new PageLoader();
        update.action = Action.UPDATE;
        update.page = page;
        return update;
    }

    public static PageLoader deletePage(URL url) throws MalformedURLException {
        Objects.requireNonNull(url, "Url cannot be null");
        PageLoader update = new PageLoader();
        update.action = Action.DELETE;
        update.delUrl = url;
        return update;
    }

    @Override
    public void load(TransactionBase tx, Context context) throws Exception {

        TypedTransactionBase ttx = Constants.TYPEL.wrap(tx);

        Gson gson = new Gson();
        RowHasher rowHasher = PageObserver.getPageRowHasher();

        switch (action) {
        case DELETE:
            ttx.mutate().row(rowHasher.addHash(delUrl.toUri())).col(Constants.PAGE_NEW_COL).set(Page.DELETE_JSON);
            break;
        case UPDATE:
            String newJson = gson.toJson(page);
            ttx.mutate().row(rowHasher.addHash(page.getUri())).col(Constants.PAGE_NEW_COL).set(newJson);
            break;
        default:
            log.error("PageUpdate called with no action");
        }
    }

    private enum Action {
        UPDATE, DELETE,
    }
}