/*
* Copyright 2009 Google Inc.
*
* 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.jstestdriver.server.handlers;
import com.google.gson.Gson;
import com.google.gson.reflect.TypeToken;
import com.google.inject.Inject;
import com.google.jstestdriver.FileInfo;
import com.google.jstestdriver.FileSetCacheStrategy;
import com.google.jstestdriver.requesthandlers.RequestHandler;
import java.io.IOException;
import java.util.Collection;
import java.util.Set;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* Provides a filecache for clients to determine if a file has changed since they last ran.
* @author corysmith@google.com (Cory Smith)
*/
class FileCacheHandler implements RequestHandler {
private final HttpServletRequest request;
private final HttpServletResponse response;
private final Gson gson;
private final Set<FileInfo> currentFiles;
private final FileSetCacheStrategy strategy;
@Inject
public FileCacheHandler(
HttpServletRequest request,
HttpServletResponse response,
Gson gson,
Set<FileInfo> currentFiles,
FileSetCacheStrategy strategy) {
this.request = request;
this.response = response;
this.gson = gson;
this.currentFiles = currentFiles;
this.strategy = strategy;
}
@Override
public void handleIt() throws IOException {
String fileSetString = request.getParameter("fileSet");
Collection<FileInfo> newFiles =
gson.fromJson(fileSetString,
new TypeToken<Collection<FileInfo>>() {}.getType());
response.getWriter().write(
gson.toJson(strategy.createExpiredFileSet(newFiles, currentFiles)));
// updates the currentFiles, as FileInfo hashes by name.
for (FileInfo fileInfo : newFiles) {
currentFiles.remove(fileInfo);
currentFiles.add(fileInfo);
}
}
}