Example usage for java.util.concurrent.atomic AtomicLong accumulateAndGet

Introduction

In this page you can find the example usage for java.util.concurrent.atomic AtomicLong accumulateAndGet.

Prototype

public final long accumulateAndGet(long x, LongBinaryOperator accumulatorFunction) 

Source Link

Document

Atomically updates (with memory effects as specified by VarHandle#compareAndSet ) the current value with the results of applying the given function to the current and given values, returning the updated value.

Usage

From source file:org.codice.solr.factory.impl.SolrClientAdapter.java

@VisibleForTesting
boolean wasNotRecent(AtomicLong previous, long freq) {
    final long now = System.currentTimeMillis();

    if (now == previous.get()) {
        return false;
    }/*from  w w w  .ja v  a  2 s.  co  m*/
    // update if not recent (i.e. if the last occurrence was older than the specified frequency
    return previous.accumulateAndGet(now, (last, n) -> ((now - last) >= freq) ? now : last) == now;
}

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From source file:org.zanata.sync.jobs.cache.RepoCacheImpl.java

private long copyDir(Path source, Path target) throws IOException {
    Files.createDirectories(target);
    AtomicLong totalSize = new AtomicLong(0);
    Files.walkFileTree(source, EnumSet.of(FileVisitOption.FOLLOW_LINKS), Integer.MAX_VALUE,
            new SimpleFileVisitor<Path>() {
                @Override//w w w  .  j av  a2 s . co  m
                public FileVisitResult preVisitDirectory(Path dir, BasicFileAttributes attrs)
                        throws IOException {
                    Path targetdir = target.resolve(source.relativize(dir));
                    try {
                        if (Files.isDirectory(targetdir) && Files.exists(targetdir)) {
                            return CONTINUE;
                        }
                        Files.copy(dir, targetdir, StandardCopyOption.REPLACE_EXISTING,
                                StandardCopyOption.COPY_ATTRIBUTES);
                    } catch (FileAlreadyExistsException e) {
                        if (!Files.isDirectory(targetdir)) {
                            throw e;
                        }
                    }
                    return CONTINUE;
                }

                @Override
                public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) throws IOException {
                    if (Files.isRegularFile(file)) {
                        totalSize.accumulateAndGet(Files.size(file), (l, r) -> l + r);
                    }
                    Path targetFile = target.resolve(source.relativize(file));

                    // only copy to target if it doesn't exist or it exist but the content is different
                    if (!Files.exists(targetFile)
                            || !com.google.common.io.Files.equal(file.toFile(), targetFile.toFile())) {
                        Files.copy(file, targetFile, StandardCopyOption.REPLACE_EXISTING,
                                StandardCopyOption.COPY_ATTRIBUTES);
                    }
                    return CONTINUE;
                }
            });
    return totalSize.get();
}

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