org.commonjava.rwx.http.httpclient4.EStreamResponseHandler.java Source code

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Here is the source code for org.commonjava.rwx.http.httpclient4.EStreamResponseHandler.java

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/**
 * Copyright (C) 2010 Red Hat, Inc. (jdcasey@commonjava.org)
 *
 * 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 org.commonjava.rwx.http.httpclient4;

import org.apache.commons.io.IOUtils;
import org.apache.http.HttpResponse;
import org.apache.http.StatusLine;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.ResponseHandler;
import org.commonjava.rwx.error.XmlRpcException;
import org.commonjava.rwx.estream.model.Event;
import org.commonjava.rwx.impl.estream.EventStreamParserImpl;
import org.commonjava.rwx.impl.stax.StaxParser;
import org.commonjava.rwx.spi.FaultAwareWrapper;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.util.List;

public class EStreamResponseHandler implements ResponseHandler<List<Event<?>>> {

    private XmlRpcException error;

    public void throwExceptions() throws XmlRpcException {
        if (error != null) {
            throw error;
        }
    }

    @Override
    public List<Event<?>> handleResponse(final HttpResponse resp) throws ClientProtocolException, IOException {
        final StatusLine status = resp.getStatusLine();
        System.out.println(status);
        if (status.getStatusCode() > 199 && status.getStatusCode() < 203) {
            final ByteArrayOutputStream baos = new ByteArrayOutputStream();
            IOUtils.copy(resp.getEntity().getContent(), baos);

            Logger logger = LoggerFactory.getLogger(getClass());

            File recording = null;
            FileOutputStream stream = null;
            try {
                recording = File.createTempFile("xml-rpc.response.", ".xml");
                stream = new FileOutputStream(recording);
                stream.write(baos.toByteArray());
            } catch (final IOException e) {
                logger.debug("Failed to record xml-rpc response to file.", e);
                // this is an auxilliary function. ignore errors.
            } finally {
                IOUtils.closeQuietly(stream);
                logger.info("\n\n\nRecorded response to: {}\n\n\n", recording);
            }

            try {
                logger.trace("Got response: \n\n{}", new Object() {
                    @Override
                    public String toString() {
                        try {
                            return new String(baos.toByteArray(), "UTF-8");
                        } catch (final UnsupportedEncodingException e) {
                            return new String(baos.toByteArray());
                        }
                    }
                });

                final EventStreamParserImpl estream = new EventStreamParserImpl();
                new StaxParser(new ByteArrayInputStream(baos.toByteArray())).parse(new FaultAwareWrapper(estream));

                return estream.getEvents();
            } catch (final XmlRpcException e) {
                error = e;
                return null;
            }
        } else {
            error = new XmlRpcException("Invalid response status: '" + status + "'.");
            return null;
        }
    }

}