net.pms.io.NullProcessWrapperConsumer.java Source code

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Here is the source code for net.pms.io.NullProcessWrapperConsumer.java

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/*
 * Digital Media Server, for streaming digital media to DLNA compatible devices
 * based on www.ps3mediaserver.org and www.universalmediaserver.com.
 * Copyright (C) 2016 Digital Media Server developers.
 *
 * This program is a free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; version 2
 * of the License only.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */
package net.pms.io;

import static org.apache.commons.lang3.StringUtils.isBlank;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.nio.charset.Charset;
import java.nio.charset.StandardCharsets;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.Callable;
import java.util.concurrent.FutureTask;
import javax.annotation.Nullable;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import net.pms.service.Services;

/**
 * A {@link ProcessWrapperConsumer} implementation that doesn't return the
 * process output.
 *
 * @author Nadahar
 */
public class NullProcessWrapperConsumer implements ProcessWrapperConsumer<NullProcessWrapperResult, Void> {

    private static final Logger LOGGER = LoggerFactory.getLogger(NullProcessWrapperConsumer.class);

    @Override
    @Nullable
    public FutureTask<Void> consume(InputStream inputStream) {
        return consume(inputStream, null);
    }

    @Override
    @Nullable
    public FutureTask<Void> consume(@Nullable final InputStream inputStream, @Nullable String threadName) {
        if (inputStream == null) {
            return null;
        }
        Callable<Void> callable = new Callable<Void>() {

            @Override
            public Void call() throws IOException {
                List<String> result = LOGGER.isTraceEnabled() ? new ArrayList<String>() : null;
                Charset outputCharset;
                if (Services.WINDOWS_CONSOLE != null) {
                    outputCharset = Services.WINDOWS_CONSOLE;
                } else {
                    outputCharset = StandardCharsets.UTF_8;
                }

                try (BufferedReader reader = new BufferedReader(
                        new InputStreamReader(inputStream, outputCharset))) {
                    String line;
                    while ((line = reader.readLine()) != null) {
                        if (result != null) {
                            result.add(line);
                        }
                    }
                }
                if (result != null) {
                    LOGGER.trace("Discarded {} lines of process output:", result.size());
                    for (String line : result) {
                        LOGGER.trace("  Process output: {}", line);
                    }
                }
                return null;
            }
        };
        FutureTask<Void> result = new FutureTask<Void>(callable);
        Thread runner;
        if (isBlank(threadName)) {
            runner = new Thread(result);
        } else {
            runner = new Thread(result, threadName);
        }
        runner.start();
        return result;
    }

    @Override
    public NullProcessWrapperResult createResult(@Nullable Void output, int exitCode,
            @Nullable Throwable throwable) {
        return null;
    }

}