--- /dev/null
+package net.sf.openrocket.startup;
+
+import java.io.File;
+import java.io.IOException;
+import java.io.InputStream;
+import java.util.List;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.LinkedBlockingQueue;
+import java.util.concurrent.ThreadFactory;
+import java.util.concurrent.ThreadPoolExecutor;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.atomic.AtomicInteger;
+
+import net.sf.openrocket.database.ThrustCurveMotorSet;
+import net.sf.openrocket.database.ThrustCurveMotorSetDatabase;
+import net.sf.openrocket.file.iterator.DirectoryIterator;
+import net.sf.openrocket.file.iterator.FileIterator;
+import net.sf.openrocket.file.motor.MotorLoaderHelper;
+import net.sf.openrocket.gui.util.SimpleFileFilter;
+import net.sf.openrocket.gui.util.SwingPreferences;
+import net.sf.openrocket.logging.LogHelper;
+import net.sf.openrocket.motor.Motor;
+import net.sf.openrocket.motor.ThrustCurveMotor;
+import net.sf.openrocket.util.BugException;
+import net.sf.openrocket.util.Pair;
+
+/**
+ * Load motors in parallel using a three stage pipeline.
+ *
+ * Stage 1: single thread managed by the ThrustCurveMotorSetDatabase. This thread generates
+ * one object for each thrust curve motor file and puts it in the second stage.
+ *
+ * Stage 2: multiple threads which process individual files. Each process takes
+ * a single motor file and parses out the list of motors it contains.
+ * The list of motors is queued up for the third stage to process.
+ *
+ * Stage 3: single thread which processes the list of motors generated in stage 2.
+ * This thread puts all the motors from the list in the motor set database.
+ *
+ * It is important that stage 3 be done with a single thread because ThrustCurveMotorSetDatabase
+ * is not thread safe. Even if synchronization were to be done, it is unlikely that parallelizing
+ * this process would improve anything.
+ *
+ *
+ */
+public class ConcurrentLoadingThrustCurveMotorSetDatabase extends ThrustCurveMotorSetDatabase {
+
+ private static final LogHelper log = Application.getLogger();
+ private final String thrustCurveDirectory;
+
+ /** Block motor loading for this many milliseconds */
+ // Block motor loading for 1.5 seconds to allow window painting to be faster
+ private static AtomicInteger blockLoading = new AtomicInteger(1500);
+
+ public ConcurrentLoadingThrustCurveMotorSetDatabase(String thrustCurveDirectory) {
+ // configure ThrustCurveMotorSetDatabase as true so we get our own thread in
+ // loadMotors.
+ super(true);
+ this.thrustCurveDirectory = thrustCurveDirectory;
+ }
+
+ @Override
+ protected void loadMotors() {
+
+ // Block loading until timeout occurs or database is taken into use
+ log.info("Blocking motor loading while starting up");
+ /*
+ while (!inUse && blockLoading.addAndGet(-100) > 0) {
+ try {
+ Thread.sleep(100);
+ } catch (InterruptedException e) {
+ }
+ }
+ */
+ log.info("Blocking ended, inUse=" + inUse + " blockLoading=" + blockLoading.get());
+
+ BookKeeping keeper = new BookKeeping();
+ keeper.start();
+
+ try {
+ keeper.waitForFinish();
+ }
+ catch ( InterruptedException iex ) {
+ throw new BugException(iex);
+ }
+
+ keeper = null;
+
+ }
+
+ private void addAll( List<Motor> motors ) {
+ for (Motor m : motors) {
+ addMotor( (ThrustCurveMotor) m);
+ }
+ }
+
+ /**
+ * A class which holds all the threading data.
+ * Implemented as an inner class so we can easily jettison the references when
+ * the processing is terminated.
+ *
+ */
+ private class BookKeeping {
+
+ /*
+ * Executor for Stage 3.
+ */
+ private final ExecutorService writerThread;
+
+ /*
+ * Executor for Stage 2.
+ */
+ private final ExecutorService loaderPool;
+
+ /*
+ * Runnable used for Stage 1.
+ */
+ private final WorkGenerator workGenerator;
+
+ private long startTime;
+
+ /*
+ * Number of thrust curves loaded
+ */
+ private int thrustCurveCount = 0;
+
+ /*
+ * Number of files processed.
+ */
+ private int fileCount = 0;
+
+ /*
+ * We have to hold on to the zip file iterator which is used to load
+ * the system motor files until all processing is done. This is because
+ * closing the iterator prematurely causes all the InputStreams opened
+ * with it to close.
+ */
+ private FileIterator iterator;
+
+ private BookKeeping() {
+
+ writerThread = new ThreadPoolExecutor(1,1,200, TimeUnit.SECONDS,
+ new LinkedBlockingQueue<Runnable>(),
+ new ThreadFactory() {
+ @Override
+ public Thread newThread(Runnable r) {
+ Thread t = new Thread(r,"MotorWriterThread");
+ return t;
+ }
+ });
+
+ loaderPool = new ThreadPoolExecutor(10,10, 2, TimeUnit.SECONDS,
+ new LinkedBlockingQueue<Runnable>(),
+ new ThreadFactory() {
+ int threadCount = 0;
+ @Override
+ public Thread newThread(Runnable r) {
+ Thread t = new Thread(r,"MotorLoaderPool-" + threadCount++);
+ return t;
+ }
+ });
+
+ workGenerator = new WorkGenerator();
+
+ }
+
+ private void start() {
+
+ startTime = System.currentTimeMillis();
+
+ log.info("Starting motor loading from " + thrustCurveDirectory + " in background thread.");
+
+ // Run the work generator - in this thread.
+ workGenerator.run();
+
+ }
+
+ private void waitForFinish() throws InterruptedException {
+ try {
+ loaderPool.shutdown();
+ loaderPool.awaitTermination(90, TimeUnit.SECONDS);
+ writerThread.shutdown();
+ writerThread.awaitTermination(90, TimeUnit.SECONDS);
+ }
+ finally {
+ iterator.close();
+ }
+
+ long endTime = System.currentTimeMillis();
+
+ int distinctMotorCount = 0;
+ int distinctThrustCurveCount = 0;
+ distinctMotorCount = motorSets.size();
+ for (ThrustCurveMotorSet set : motorSets) {
+ distinctThrustCurveCount += set.getMotorCount();
+ }
+
+ log.info("Motor loading done, took " + (endTime - startTime) + " ms to load "
+ + fileCount + " files/directories containing "
+ + thrustCurveCount + " thrust curves which contained "
+ + distinctMotorCount + " distinct motors with "
+ + distinctThrustCurveCount + " distinct thrust curves.");
+
+ }
+
+
+ private class WorkGenerator implements Runnable {
+
+ @Override
+ public void run() {
+ // Start loading
+ log.info("Loading motors from " + thrustCurveDirectory);
+
+ iterator = DirectoryIterator.findDirectory(thrustCurveDirectory,
+ new SimpleFileFilter("", false, "eng", "rse"));
+
+ // Load the packaged thrust curves
+ if (iterator == null) {
+ throw new IllegalStateException("Thrust curve directory " + thrustCurveDirectory +
+ "not found, distribution built wrong");
+ }
+
+ while( iterator.hasNext() ) {
+ Pair<String,InputStream> f = iterator.next();
+ MotorLoader loader = new MotorLoader( f.getV(), f.getU() );
+ loaderPool.execute(loader);
+ fileCount ++;
+ }
+
+ // Load the user-defined thrust curves
+ for (File file : ((SwingPreferences) Application.getPreferences()).getUserThrustCurveFiles()) {
+ log.info("Loading motors from " + file);
+ MotorLoader loader = new MotorLoader( file );
+ loaderPool.execute(loader);
+ fileCount++;
+ }
+ }
+ }
+
+ private class MotorLoader implements Runnable {
+
+ private final InputStream is;
+ private final String fileName;
+
+ private final File file;
+
+ public MotorLoader( File file ) {
+ super();
+ this.file = file;
+ this.is = null;
+ this.fileName = null;
+ }
+
+ public MotorLoader(InputStream is, String fileName) {
+ super();
+ this.file = null;
+ this.is = is;
+ this.fileName = fileName;
+ }
+
+ @Override
+ public void run() {
+ log.debug("Loading motor from " + fileName);
+
+ try {
+ List<Motor> motors;
+ if ( file == null ) {
+ motors = MotorLoaderHelper.load(is, fileName);
+ } else {
+ motors = MotorLoaderHelper.load(file);
+ }
+ writerThread.submit( new MotorInserter(motors));
+ }
+ finally {
+ if ( is != null ) {
+ try {
+ is.close();
+ } catch ( IOException iex ) {
+ }
+ }
+ }
+ }
+ }
+
+ private class MotorInserter implements Runnable {
+
+ private final List<Motor> motors;
+
+ MotorInserter( List<Motor> motors ) {
+ this.motors = motors;
+ }
+
+ @Override
+ public void run() {
+ thrustCurveCount += motors.size();
+ ConcurrentLoadingThrustCurveMotorSetDatabase.this.addAll(motors);
+ }
+
+ }
+ }
+
+}
projects / debian / openrocket / blobdiff