com.kk_electronic.kkportal.examples.rpc.PHPDispatcher.java Source code

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Here is the source code for com.kk_electronic.kkportal.examples.rpc.PHPDispatcher.java

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/*
 * Copyright 2010 kk-electronic a/s. 
 * 
 * This file is part of KKPortal.
 *
 * KKPortal is free software: you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as published
 * by the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * KKPortal is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with KKPortal.  If not, see <http://www.gnu.org/licenses/>.
 *
 */
package com.kk_electronic.kkportal.examples.rpc;

import com.google.gwt.http.client.Request;
import com.google.gwt.http.client.RequestBuilder;
import com.google.gwt.http.client.RequestCallback;
import com.google.gwt.http.client.RequestException;
import com.google.gwt.http.client.Response;
import com.google.gwt.json.client.JSONValue;
import com.google.inject.Inject;
import com.kk_electronic.kkportal.core.rpc.Dispatcher;
import com.kk_electronic.kkportal.core.rpc.JsonEncoder;
import com.kk_electronic.kkportal.core.rpc.jsonformat.UnableToDeserialize;
import com.kk_electronic.kkportal.core.rpc.jsonformat.UnableToSerialize;

/**
 * An Example of how a dispatcher for service requests would look written to use PHP
 * 
 * TODO: Write a more extensive comment on this dispatcher
 * 
 * It's server side file is located in "war-src/php" and is called dispatch.php
 * 
 * @author Jes Andersen
 *
 */
public class PHPDispatcher implements Dispatcher {

    private final JsonEncoder encoder;

    @Inject
    public PHPDispatcher(JsonEncoder encoder) {
        this.encoder = encoder;
    }

    @Override
    public <T> void execute(final com.kk_electronic.kkportal.core.rpc.Request<T> orequest) {
        String url = "php/dispatch.php?i=" + orequest.getServerinterface().getName() + "&m=" + orequest.getMethod();
        RequestBuilder builder = new RequestBuilder(RequestBuilder.POST, url);
        StringBuilder sb = new StringBuilder();
        try {
            encoder.encode(orequest.getParams(), sb);
        } catch (UnableToSerialize e) {
            orequest.onFailure(e);
        }
        try {
            builder.sendRequest(sb.toString(), new RequestCallback() {

                @Override
                public void onError(com.google.gwt.http.client.Request request, Throwable exception) {
                    orequest.onFailure(exception);
                }

                @Override
                public void onResponseReceived(Request request, Response response) {
                    JSONValue result;
                    try {
                        result = encoder.decode(response.getText());
                    } catch (UnableToDeserialize e) {
                        orequest.onFailure(e);
                        return;
                    }
                    T decodedResult = null;
                    try {
                        decodedResult = encoder.validate(result, decodedResult, orequest.getReturnValueType());
                    } catch (UnableToDeserialize e) {
                        orequest.onFailure(e);
                        return;
                    }
                    orequest.onSuccess(decodedResult);
                }
            });
        } catch (RequestException e) {
            orequest.onFailure(e);
        }
    }
}