Java tutorial
/* * The MIT License (MIT) * * Copyright (c) 2016 by luxe - https://github.com/de-luxe - BURST-LUXE-RED2-G6JW-H4HG5 * * 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 burstcoin.jminer.core.reader.task; import burstcoin.jminer.core.CoreProperties; import burstcoin.jminer.core.reader.Reader; import burstcoin.jminer.core.reader.data.PlotDrive; import burstcoin.jminer.core.reader.data.PlotFile; import burstcoin.jminer.core.reader.event.ReaderDriveFinishEvent; import burstcoin.jminer.core.reader.event.ReaderDriveInterruptedEvent; import burstcoin.jminer.core.reader.event.ReaderLoadedPartEvent; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.context.ApplicationEventPublisher; import org.springframework.context.annotation.Scope; import org.springframework.stereotype.Component; import pocminer.generate.MiningPlot; import java.io.IOException; import java.nio.ByteBuffer; import java.nio.channels.ClosedByInterruptException; import java.nio.channels.SeekableByteChannel; import java.nio.file.Files; import java.nio.file.NoSuchFileException; import java.nio.file.StandardOpenOption; import java.util.Date; import java.util.EnumSet; import java.util.Iterator; /** * Executed once for every block ... reads scoops of drive plots */ @Component @Scope("prototype") public class ReaderLoadDriveTask implements Runnable { private static final Logger LOG = LoggerFactory.getLogger(ReaderLoadDriveTask.class); @Autowired private ApplicationEventPublisher publisher; private PlotDrive plotDrive; private int scoopNumber; private long blockNumber; private boolean showDriveInfo; public void init(int scoopNumber, long blockNumber, PlotDrive plotDrive) { this.scoopNumber = scoopNumber; this.blockNumber = blockNumber; this.plotDrive = plotDrive; showDriveInfo = CoreProperties.isShowDriveInfo(); } @Override public void run() { long startTime = showDriveInfo ? new Date().getTime() : 0; Iterator<PlotFile> iterator = plotDrive.getPlotFiles().iterator(); boolean interrupted = false; while (iterator.hasNext() && !interrupted) { PlotFile plotPathInfo = iterator.next(); if (plotPathInfo.getStaggeramt() % plotPathInfo.getNumberOfParts() > 0) { LOG.warn("staggeramt " + plotPathInfo.getStaggeramt() + " can not be devided by " + plotPathInfo.getNumberOfParts()); // fallback ... could lead to problems on optimized plot-files plotPathInfo.setNumberOfParts(1); } interrupted = load(plotPathInfo); } if (showDriveInfo) { if (interrupted) { publisher.publishEvent(new ReaderDriveInterruptedEvent(blockNumber, plotDrive.getDirectory())); } else { publisher.publishEvent(new ReaderDriveFinishEvent(plotDrive.getDirectory(), plotDrive.getSize(), new Date().getTime() - startTime, blockNumber)); } } } private boolean load(PlotFile plotFile) { try (SeekableByteChannel sbc = Files.newByteChannel(plotFile.getFilePath(), EnumSet.of(StandardOpenOption.READ))) { long currentScoopPosition = scoopNumber * plotFile.getStaggeramt() * MiningPlot.SCOOP_SIZE; long partSize = plotFile.getStaggeramt() / plotFile.getNumberOfParts(); ByteBuffer partBuffer = ByteBuffer.allocate((int) (partSize * MiningPlot.SCOOP_SIZE)); // optimized plotFiles only have one chunk! for (int chunkNumber = 0; chunkNumber < plotFile.getNumberOfChunks(); chunkNumber++) { long currentChunkPosition = chunkNumber * plotFile.getStaggeramt() * MiningPlot.PLOT_SIZE; sbc.position(currentScoopPosition + currentChunkPosition); for (int partNumber = 0; partNumber < plotFile.getNumberOfParts(); partNumber++) { sbc.read(partBuffer); if (Reader.blockNumber != blockNumber) { LOG.trace("loadDriveThread stopped!"); partBuffer.clear(); sbc.close(); return true; } else { long chunkPartStartNonce = plotFile.getStartnonce() + (chunkNumber * plotFile.getStaggeramt()) + (partNumber * partSize); final byte[] scoops = partBuffer.array(); publisher.publishEvent(new ReaderLoadedPartEvent(blockNumber, scoops, chunkPartStartNonce)); } partBuffer.clear(); } } sbc.close(); } catch (NoSuchFileException exception) { LOG.error("File not found ... please restart to rescan plot-files, maybe set rescan to 'true': " + exception.getMessage()); } catch (ClosedByInterruptException e) { // we reach this, if we do not wait for task on shutdown - ByteChannel closed by thread interruption LOG.trace("reader stopped cause of new block ..."); } catch (IOException e) { LOG.error("IOException: " + e.getMessage()); } return false; } }