root / web_client / src / org / gss_project / gss / web / client / rest / GetCommand.java @ f1ec19a9
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/*
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* Copyright 2009 Electronic Business Systems Ltd.
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*
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* This file is part of GSS.
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*
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* GSS is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* GSS is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GSS. If not, see <http://www.gnu.org/licenses/>.
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*/
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package org.gss_project.gss.web.client.rest; |
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import org.gss_project.gss.web.client.GSS; |
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import org.gss_project.gss.web.client.rest.resource.FileResource; |
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import org.gss_project.gss.web.client.rest.resource.FolderResource; |
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import org.gss_project.gss.web.client.rest.resource.GroupResource; |
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import org.gss_project.gss.web.client.rest.resource.GroupUserResource; |
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import org.gss_project.gss.web.client.rest.resource.GroupsResource; |
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import org.gss_project.gss.web.client.rest.resource.OtherUserResource; |
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import org.gss_project.gss.web.client.rest.resource.OthersResource; |
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import org.gss_project.gss.web.client.rest.resource.RestResource; |
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import org.gss_project.gss.web.client.rest.resource.SearchResource; |
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import org.gss_project.gss.web.client.rest.resource.SharedResource; |
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import org.gss_project.gss.web.client.rest.resource.TagsResource; |
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import org.gss_project.gss.web.client.rest.resource.TrashResource; |
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import org.gss_project.gss.web.client.rest.resource.UploadStatusResource; |
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import org.gss_project.gss.web.client.rest.resource.UserResource; |
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import org.gss_project.gss.web.client.rest.resource.UserSearchResource; |
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import java.util.HashMap; |
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import java.util.Map; |
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import com.google.gwt.core.client.GWT; |
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import com.google.gwt.http.client.Request; |
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import com.google.gwt.http.client.RequestBuilder; |
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import com.google.gwt.http.client.Response; |
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/**
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* @author kman
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*/
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public abstract class GetCommand<T extends RestResource> extends RestCommand{ |
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boolean complete = false; |
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T result = null;
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Throwable exception = null; |
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Class<T> aclass;
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private final String path; |
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private String username; |
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private boolean requestSent = false; |
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T cached; |
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private static final long MAX_CACHE_AGE = 1000; |
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private static class RequestData { |
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public String path; |
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public String username; |
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public RequestData(String _path, String _username) { |
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path = _path; |
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username = _username; |
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} |
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@Override
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public int hashCode() { |
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final int prime = 31; |
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int result = 1; |
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result = prime * result + ((path == null) ? 0 : path.hashCode()); |
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result = prime * result + ((username == null) ? 0 : username.hashCode()); |
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return result;
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} |
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@Override
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public boolean equals(Object obj) { |
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if (this == obj) |
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return true; |
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if (obj == null) |
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return false; |
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if (getClass() != obj.getClass())
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return false; |
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RequestData other = (RequestData) obj; |
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if (path == null) { |
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if (other.path != null) |
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return false; |
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} else if (!path.equals(other.path)) |
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return false; |
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if (username == null) { |
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if (other.username != null) |
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return false; |
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} else if (!username.equals(other.username)) |
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return false; |
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return true; |
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} |
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} |
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private static class ResponseData { |
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public long timestamp; |
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public Object result; |
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public ResponseData(long _timestamp, Object _result) { |
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timestamp = _timestamp; |
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result = _result; |
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} |
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} |
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private static Map<RequestData, ResponseData> cache = new HashMap<RequestData, ResponseData>(); |
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public GetCommand(Class<T> theclass, String pathToGet, T theCached){ |
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this(theclass, pathToGet, true, theCached); |
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} |
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public GetCommand(Class<T> theclass, String pathToGet, boolean showLoading, T theCached){ |
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setShowLoadingIndicator(showLoading); |
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if(isShowLoadingIndicator())
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GSS.get().showLoadingIndicator("Getting ",pathToGet);
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this.aclass = theclass;
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if(pathToGet.indexOf("?") != -1) |
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path = pathToGet; |
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else
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path =fixPath(pathToGet); |
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this.cached = theCached;
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} |
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public GetCommand(Class<T> theclass, String aUsername , String pathToGet, T theCached){ |
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this(theclass, aUsername, pathToGet, true, theCached); |
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} |
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public GetCommand(Class<T> theclass, String aUsername , String pathToGet, boolean showLoading, T theCached){ |
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setShowLoadingIndicator(showLoading); |
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if(isShowLoadingIndicator())
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GSS.get().showLoadingIndicator("Getting ",pathToGet);
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this.aclass = theclass;
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path = fixPath(pathToGet); |
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this.username = aUsername;
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this.cached = theCached;
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} |
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private void sendRequest(){ |
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if(requestSent)
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return;
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requestSent=true;
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RequestBuilder builder = new RequestBuilder(RequestBuilder.GET, path);
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if(cached!=null && cached.getLastModifiedSince() != null) |
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builder.setHeader("If-Modified-Since", cached.getLastModifiedSince());
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try {
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if(username == null) |
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handleHeaders(builder, path); |
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else
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handleHeaders(username, builder, path); |
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builder.sendRequest("", new RestCallback(path) { |
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@Override
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public Object deserialize(Response response) { |
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return deserializeResponse(path, response);
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} |
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@Override
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public void handleError(Request request, Throwable _exception) { |
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result = null;
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complete = true;
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exception = _exception; |
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if(_exception instanceof RestException) |
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if(((RestException)_exception).getHttpStatusCode() == 304 && cached != null){ |
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GWT.log("Using cache:"+cached.getUri(), null); |
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handleSuccess(cached); |
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return;
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} |
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} |
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@Override
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public void handleSuccess(Object object) { |
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result = (T) object; |
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complete = true;
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} |
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}); |
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} catch (Exception ex) { |
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complete = true;
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exception = ex; |
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} |
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} |
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public boolean isComplete() { |
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return complete;
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} |
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public T getResult(){
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return result;
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} |
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@Override
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public boolean execute() { |
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boolean com = isComplete();
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RequestData key = new RequestData(path, username);
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if (!com) {
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if (cache.containsKey(key)) {
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ResponseData resp = cache.get(key); |
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if (resp==null) { |
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return true; |
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} |
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// Cache hit
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if (System.currentTimeMillis()-resp.timestamp>MAX_CACHE_AGE) { |
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// Cache stale, remove
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cache.put(key,null);
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} |
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else {
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// Use cache data
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if(isShowLoadingIndicator())
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GSS.get().hideLoadingIndicator(); |
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if (resp.result instanceof Throwable) { |
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// Error to be handled
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Throwable ex = (Throwable) resp.result; |
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onError(ex); |
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return false; |
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} |
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result = (T) resp.result; |
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if (result != null) { |
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onComplete(); |
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} |
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complete = true;
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return false; |
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} |
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} |
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if(!requestSent) {
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cache.put(key,null);
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sendRequest(); |
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} |
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} |
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if(com){
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if(isShowLoadingIndicator())
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GSS.get().hideLoadingIndicator(); |
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if(getResult() != null) { |
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// Add to cache
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cache.put(key, new ResponseData(System.currentTimeMillis(), getResult())); |
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onComplete(); |
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} |
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else {
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cache.put(key, new ResponseData(System.currentTimeMillis(), exception)); |
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onError(exception); |
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} |
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return false; |
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} |
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return true; |
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} |
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public Object deserializeResponse(String aPath, Response response) { |
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RestResource result1 = null;
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if(aclass.equals(FolderResource.class)){
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result1 = new FolderResource(aPath);
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result1.createFromJSON(response.getText()); |
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} |
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else if(aclass.equals(FileResource.class)){ |
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result1 = new FileResource(aPath);
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result1.createFromJSON(response.getHeader("X-GSS-Metadata"));
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} |
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else if(aclass.equals(GroupsResource.class)){ |
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result1 = new GroupsResource(aPath);
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result1.createFromJSON(response.getText()); |
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} |
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else if(aclass.equals(TrashResource.class)){ |
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result1 = new TrashResource(aPath);
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result1.createFromJSON(response.getText()); |
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} |
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else if(aclass.equals(SharedResource.class)){ |
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result1 = new SharedResource(aPath);
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result1.createFromJSON(response.getText()); |
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} |
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else if(aclass.equals(OthersResource.class)){ |
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result1 = new OthersResource(aPath);
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result1.createFromJSON(response.getText()); |
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} |
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else if(aclass.equals(OtherUserResource.class)){ |
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result1 = new OtherUserResource(aPath);
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result1.createFromJSON(response.getText()); |
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} |
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else if(aclass.equals(GroupResource.class)){ |
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result1 = new GroupResource(aPath);
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result1.createFromJSON(response.getText()); |
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} |
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else if(aclass.equals(GroupUserResource.class)){ |
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result1 = new GroupUserResource(aPath);
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result1.createFromJSON(response.getText()); |
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} |
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else if(aclass.equals(UserResource.class)){ |
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result1 = new UserResource(aPath);
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result1.createFromJSON(response.getText()); |
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} |
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else if(aclass.equals(TagsResource.class)){ |
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result1 = new TagsResource(aPath);
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result1.createFromJSON(response.getText()); |
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} |
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else if(aclass.equals(SearchResource.class)){ |
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result1 = new SearchResource(aPath);
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result1.createFromJSON(response.getText()); |
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} |
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else if(aclass.equals(UserSearchResource.class)){ |
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result1 = new UserSearchResource(aPath);
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result1.createFromJSON(response.getText()); |
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} |
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else if(aclass.equals(UploadStatusResource.class)){ |
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result1 = new UploadStatusResource(aPath);
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result1.createFromJSON(response.getText()); |
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} |
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return result1;
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} |
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public T getCached() {
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return cached;
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} |
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public void setCached(T theCached) { |
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this.cached = theCached;
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} |
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public boolean usedCachedVersion(){ |
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if(exception !=null && exception instanceof RestException) |
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if(((RestException)exception).getHttpStatusCode() == 304){ |
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return true; |
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} |
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return false; |
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} |
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} |