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Basic utilities to compensate shortcomings of Java SE. Part of chicory.
There is a newer version: 0.36
/*
 * Copyright (c) 2014, Victor Nazarov 
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *     * Neither the name of the Victor Nazarov nor the
 *       names of its contributors may be used to endorse or promote products
 *       derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL  BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package com.github.sviperll.daemon;

import com.github.sviperll.Applicable;
import com.github.sviperll.Consumer;
import com.github.sviperll.ResourceProvider;
import com.github.sviperll.ResourceProviderDefinition;
import com.github.sviperll.environment.HUPReopeningFileOutputStream;
import com.github.sviperll.logging.Handlers;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.IOException;
import java.io.OutputStream;
import java.util.logging.Handler;
import java.util.logging.Level;
import java.util.logging.Logger;

/**
 *
 * @author Victor Nazarov 
 */
public class DaemonLog {
    private static final DaemonLog STANDARD_OUT = new DaemonLog(ResourceProvider.forExisting(System.out).flatMap(FlushingLoggingFactory.INSTANCE), false, false);
    private static final DaemonLog STANDARD_ERR = new DaemonLog(ResourceProvider.forExisting(System.err).flatMap(FlushingLoggingFactory.INSTANCE), false, false);

    public static DaemonLog standardOut() {
        return STANDARD_OUT;
    }

    public static DaemonLog standardErr() {
        return STANDARD_ERR;
    }

    public static DaemonLog createInstance(File file) {
        return createInstance(file, FlushingLoggingFactory.INSTANCE);
    }

    public static DaemonLog createInstance(File file, Applicable> loggingHandlerFactory) {
        ResourceProvider streamProvider = ResourceProvider.of(new LogFileStreamProvider(file));
        ResourceProvider handlerProvider = streamProvider.flatMap(loggingHandlerFactory);
        return new DaemonLog(handlerProvider, true, true);
    }
    private final ResourceProviderDefinition handlerProvider;
    private final boolean closesStandardOut;
    private final boolean closesStandardErr;

    private DaemonLog(ResourceProviderDefinition handlerProvider, boolean closesStandardOut, boolean closesStandardErr) {
        this.handlerProvider = handlerProvider;
        this.closesStandardOut = closesStandardOut;
        this.closesStandardErr = closesStandardErr;
    }

    public ResourceProviderDefinition handlerProvider() {
        return handlerProvider;
    }

    boolean closesStandardOut() {
        return closesStandardOut;
    }

    boolean closesStandardErr() {
        return closesStandardErr;
    }

    private static class FlushingLoggingFactory implements Applicable> {
        public static final Applicable> INSTANCE = new FlushingLoggingFactory();
        @Override
        public ResourceProvider apply(final OutputStream stream) {
            return ResourceProvider.of(new FlushingHandlerResourcePeovider(stream));
        }

        private static class FlushingHandlerResourcePeovider implements ResourceProviderDefinition {

            private final OutputStream stream;

            public FlushingHandlerResourcePeovider(OutputStream stream) {
                this.stream = stream;
            }

            @Override
            public void provideResourceTo(Consumer consumer) {
                Handler handler = Handlers.createFlushingHandler(stream);
                try {
                    consumer.accept(handler);
                } finally {
                    handler.close();
                }
            }
        }
    }

    private static class LogFileStreamProvider implements ResourceProviderDefinition {
        private final File file;
        LogFileStreamProvider(File file) {
            this.file = file;
        }
        @Override
        public void provideResourceTo(Consumer consumer) {
            try {
                OutputStream stream = new HUPReopeningFileOutputStream(file);
                try {
                    BufferedOutputStream bufferedStream = new BufferedOutputStream(stream);
                    try {
                        consumer.accept(bufferedStream);
                    } finally {
                        try {
                            bufferedStream.close();
                        } catch (Exception ex) {
                            Logger.getLogger(LogFileStreamProvider.class.getName()).log(Level.SEVERE, null, ex);
                        }
                    }
                } finally {
                    try {
                        stream.close();
                    } catch (Exception ex) {
                        Logger.getLogger(LogFileStreamProvider.class.getName()).log(Level.SEVERE, null, ex);
                    }
                }
            } catch (IOException ex) {
                throw new RuntimeException(ex);
            }
        }
    }
}