com.googlecode.jmxtrans.model.output.support.HttpOutputWriter.java Source code

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Here is the source code for com.googlecode.jmxtrans.model.output.support.HttpOutputWriter.java

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/**
 * The MIT License
 * Copyright (c) 2010 JmxTrans team
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
package com.googlecode.jmxtrans.model.output.support;

import com.google.common.io.Closer;
import com.googlecode.jmxtrans.model.OutputWriterAdapter;
import com.googlecode.jmxtrans.model.Query;
import com.googlecode.jmxtrans.model.Result;
import com.googlecode.jmxtrans.model.Server;
import org.apache.commons.io.IOUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.annotation.Nonnull;
import javax.annotation.Nullable;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStreamWriter;
import java.net.HttpURLConnection;
import java.net.Proxy;
import java.net.URL;
import java.nio.charset.Charset;

import static com.google.common.base.Charsets.UTF_8;
import static com.google.common.base.MoreObjects.firstNonNull;
import static com.google.common.io.ByteStreams.copy;
import static com.google.common.io.ByteStreams.nullOutputStream;

public class HttpOutputWriter<T extends WriterBasedOutputWriter> extends OutputWriterAdapter {

    @Nonnull
    private final Logger logger = LoggerFactory.getLogger(HttpOutputWriter.class);

    @Nonnull
    private final T target;
    @Nonnull
    private final URL url;
    @Nullable
    private final Proxy proxy;
    @Nonnull
    private final HttpUrlConnectionConfigurer configurer;
    @Nonnull
    private final Charset charset;

    public HttpOutputWriter(@Nonnull T target, @Nonnull URL url, @Nullable Proxy proxy,
            @Nonnull HttpUrlConnectionConfigurer configurer, @Nullable Charset charset) {
        this.target = target;
        this.url = url;
        this.proxy = proxy;
        this.configurer = configurer;
        this.charset = firstNonNull(charset, UTF_8);
    }

    @Override
    public void doWrite(Server server, Query query, Iterable<Result> results) throws IOException {
        HttpURLConnection httpURLConnection = createHttpURLConnection();
        try {
            configurer.configure(httpURLConnection);

            writeResults(server, query, results, httpURLConnection);

            int responseCode = httpURLConnection.getResponseCode();
            if (responseCode != 200) {
                logger.warn("Failure {}:'{}' to send result to server '{}' with proxy {}", responseCode,
                        httpURLConnection.getResponseMessage(), url, proxy);
            }
            if (logger.isTraceEnabled()) {
                logger.trace(IOUtils.toString(httpURLConnection.getInputStream()));
            }
        } finally {
            consumeInputStreams(httpURLConnection);
        }
    }

    private void consumeInputStreams(HttpURLConnection httpURLConnection) throws IOException {
        Closer closer = Closer.create();
        try {
            InputStream in = closer.register(httpURLConnection.getInputStream());
            InputStream err = closer.register(httpURLConnection.getErrorStream());
            copy(in, nullOutputStream());
            if (err != null)
                copy(err, nullOutputStream());
        } catch (Throwable t) {
            throw closer.rethrow(t);
        } finally {
            closer.close();
        }
    }

    private void writeResults(Server server, Query query, Iterable<Result> results,
            HttpURLConnection httpURLConnection) throws IOException {
        Closer closer = Closer.create();
        try {
            OutputStreamWriter outputStream = closer
                    .register(new OutputStreamWriter(httpURLConnection.getOutputStream(), charset));

            target.write(outputStream, server, query, results);
        } catch (Throwable t) {
            throw closer.rethrow(t);
        } finally {
            closer.close();
        }
    }

    private HttpURLConnection createHttpURLConnection() throws IOException {
        if (proxy == null)
            return (HttpURLConnection) url.openConnection();
        else
            return (HttpURLConnection) url.openConnection(proxy);
    }

}