fm.last.moji.tracker.impl.RequestHandler.java Source code

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Here is the source code for fm.last.moji.tracker.impl.RequestHandler.java

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/*
 * Copyright 2012 Last.fm
 *
 *  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 fm.last.moji.tracker.impl;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.Writer;

import org.apache.commons.io.IOUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import fm.last.moji.tracker.TrackerException;

class RequestHandler {

    private static final Logger log = LoggerFactory.getLogger(RequestHandler.class);

    private final Writer writer;
    private final BufferedReader reader;

    RequestHandler(Writer writer, BufferedReader reader) {
        this.writer = writer;
        this.reader = reader;
    }

    Response performRequest(Request request) throws CommunicationException {
        Response response = null;
        String line = null;

        try {
            log.debug("{}", request);
            request.writeTo(writer);
            line = reader.readLine();
            log.debug("Read: {}", line);
            response = createResponseFromLine(line);
            log.debug("{}", response);
        } catch (IOException e) {
            throw new CommunicationException(e);
        }
        return response;
    }

    void close() {
        IOUtils.closeQuietly(reader);
        IOUtils.closeQuietly(writer);
    }

    private Response createResponseFromLine(String line) throws TrackerException {
        if (line == null) {
            throw new TrackerException("Empty response from tracker");
        }
        int firstSpace = line.indexOf(' ');
        if (firstSpace < 0) {
            throw new TrackerException("Invalid response from tracker: '" + line + "'");
        }
        ResponseStatus status = ResponseStatus.valueOfCode(line.substring(0, firstSpace));
        if (status == null) {
            throw new TrackerException("Invalid response from tracker: '" + line + "'");
        }
        String payload = line.substring(firstSpace + 1);
        Response response = new Response(status, payload);
        return response;
    }

}