com.goodow.realtime.server.rpc.SaveHandler.java Source code

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Here is the source code for com.goodow.realtime.server.rpc.SaveHandler.java

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/*
 * Copyright 2012 Goodow.com
 * 
 * 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 com.goodow.realtime.server.rpc;

import com.goodow.realtime.channel.constant.Constants;
import com.goodow.realtime.channel.constant.Constants.Params;
import com.goodow.realtime.server.auth.AccountContext;
import com.goodow.realtime.server.model.Delta;
import com.goodow.realtime.server.model.ObjectId;
import com.goodow.realtime.server.model.ObjectSession;
import com.goodow.realtime.server.model.RealtimeLoader;
import com.goodow.realtime.server.model.Session;

import com.google.gson.JsonArray;
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
import com.google.gson.JsonParser;
import com.google.inject.Inject;
import com.google.inject.Provider;
import com.google.walkaround.slob.server.AccessDeniedException;
import com.google.walkaround.slob.server.MutateResult;
import com.google.walkaround.slob.server.ServerMutateRequest;
import com.google.walkaround.slob.server.SlobFacilities;
import com.google.walkaround.slob.server.SlobNotFoundException;
import com.google.walkaround.util.server.servlet.AbstractHandler;
import com.google.walkaround.util.server.servlet.BadRequestException;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.logging.Logger;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * Submits a delta to a object.
 */
public class SaveHandler extends AbstractHandler {

    @SuppressWarnings("unused")
    private static final Logger log = Logger.getLogger(SaveHandler.class.getName());

    @Inject
    private SlobFacilities slobFacilities;
    @Inject
    private Provider<AccountContext> context;
    @Inject
    private RealtimeLoader loader;

    @Override
    public void doPost(HttpServletRequest req, HttpServletResponse resp) throws IOException {
        String sid = requireParameter(req, Constants.Params.SESSION_ID);
        String key = requireParameter(req, Constants.Params.ID);
        JsonObject payload = new JsonParser().parse(RpcUtil.readRequestBody(req)).getAsJsonObject();
        long version = payload.get(Params.REVISION).getAsLong();
        String changes = payload.get(Params.CHANGES).toString();

        ObjectId id = new ObjectId(key);
        Session session = new Session(context.get().getAccountInfo().getUserId(), sid);
        long resultingVersion;
        if (version == 0) {
            JsonArray jsonArray = new JsonParser().parse(changes).getAsJsonArray();
            List<Delta<String>> deltas = new ArrayList<Delta<String>>(jsonArray.size());
            for (JsonElement e : jsonArray) {
                deltas.add(new Delta<String>(session, e.toString()));
            }
            loader.create(id, deltas);
            resultingVersion = deltas.size();
        } else {
            ServerMutateRequest mutateRequest = new ServerMutateRequest();
            mutateRequest.setSession(new ObjectSession(id, session));
            mutateRequest.setVersion(version);
            mutateRequest.setDeltas(changes);

            MutateResult res;
            try {
                res = slobFacilities.getSlobStore().mutateObject(mutateRequest);
            } catch (SlobNotFoundException e) {
                throw new BadRequestException("Object not found or access denied", e);
            } catch (AccessDeniedException e) {
                throw new BadRequestException("Object not found or access denied", e);
            }
            resultingVersion = res.getResultingVersion();
        }

        JsonObject json = new JsonObject();
        json.addProperty(Constants.Params.REVISION, resultingVersion);
        RpcUtil.writeJsonResult(req, resp, json.toString());
    }
}