/*
* Copyright 2011 Google Inc. All Rights Reserved.
*
* 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.google.walkaround.wave.server.admin;
import com.google.common.collect.Lists;
import com.google.gxp.base.GxpContext;
import com.google.gxp.html.HtmlClosure;
import com.google.inject.Inject;
import com.google.walkaround.slob.server.MutationLog;
import com.google.walkaround.slob.server.SlobStoreSelector;
import com.google.walkaround.slob.server.MutationLog.DeltaIterator;
import com.google.walkaround.slob.shared.SlobId;
import com.google.walkaround.util.server.RetryHelper.PermanentFailure;
import com.google.walkaround.util.server.RetryHelper.RetryableFailure;
import com.google.walkaround.util.server.appengine.CheckedDatastore;
import com.google.walkaround.util.server.appengine.CheckedDatastore.CheckedTransaction;
import com.google.walkaround.util.server.servlet.AbstractHandler;
import com.google.walkaround.util.server.servlet.BadRequestException;
import com.google.walkaround.wave.server.Flag;
import com.google.walkaround.wave.server.FlagName;
import com.google.walkaround.wave.server.gxp.Admin;
import com.google.walkaround.wave.server.gxp.StoreViewFragment;
import org.waveprotocol.wave.model.util.Pair;
import java.io.IOException;
import java.util.List;
import java.util.logging.Logger;
import javax.annotation.Nullable;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* @author danilatos@google.com (Daniel Danilatos)
* @author ohler@google.com (Christian Ohler)
*/
public class StoreViewHandler extends AbstractHandler {
@SuppressWarnings("unused")
private static final Logger log = Logger.getLogger(StoreViewHandler.class.getName());
@Inject CheckedDatastore datastore;
@Inject SlobStoreSelector storeSelector;
@Inject @Flag(FlagName.ANALYTICS_ACCOUNT) String analyticsAccount;
@Override
public void doGet(HttpServletRequest req, HttpServletResponse resp) throws IOException {
String storeType = optionalParameter(req, "storeType", "Wavelet");
String id = optionalParameter(req, "id", "");
String snapshotVersion = optionalParameter(req, "snapshotVersion", "");
String historyStart = optionalParameter(req, "historyStart", "0");
String historyEnd = optionalParameter(req, "historyEnd", "");
@Nullable Long objectVersion = null;
List<Pair<Long, String>> items = Lists.newArrayList();
String snapshot = "";
if (!id.isEmpty()) {
try {
SlobId objectId = new SlobId(id);
CheckedTransaction tx = datastore.beginTransaction();
try {
MutationLog mutationLog = storeSelector.get(storeType).getMutationLogFactory()
.create(tx, objectId);
objectVersion = mutationLog.getVersion();
if (!historyStart.isEmpty()) {
long start = Long.parseLong(historyStart);
DeltaIterator it = mutationLog.forwardHistory(start,
historyEnd.isEmpty() ? start + 1000 : Long.parseLong(historyEnd));
for (long version = start; it.hasNext(); version++) {
items.add(Pair.of(version, "" + it.next()));
}
}
if (!snapshotVersion.isEmpty()) {
snapshot = mutationLog.reconstruct(Long.parseLong(snapshotVersion))
.getState().snapshot();
}
} finally {
tx.rollback();
}
} catch (NumberFormatException e) {
throw new BadRequestException(e);
} catch (PermanentFailure e) {
throw new IOException(e);
} catch (RetryableFailure e) {
throw new IOException(e);
}
}
HtmlClosure content = StoreViewFragment.getGxpClosure(
storeType, id, objectVersion == null ? "" : ("" + objectVersion),
historyStart, historyEnd, items, snapshotVersion, snapshot);
resp.setContentType("text/html");
Admin.write(resp.getWriter(), new GxpContext(getLocale(req)),
analyticsAccount, content);
}
}