Examples with BoundsFilteringDiffConsumer org.locationtech.geogig.api.plumbing.diff.BoundsFilteringDiffConsumer used on opensource projects

Example 1 with BoundsFilteringDiffConsumer

use of org.locationtech.geogig.api.plumbing.diff.BoundsFilteringDiffConsumer in project GeoGig by boundlessgeo.

the class DiffTree method _call.

/**
     * Finds differences between the two specified trees.
     * 
     * @return an iterator to a set of differences between the two trees
     * @see DiffEntry
     */
@Override
protected Iterator<DiffEntry> _call() throws IllegalArgumentException {
    checkNotNull(oldRefSpec, "old version not specified");
    checkNotNull(newRefSpec, "new version not specified");
    final RevTree oldTree = resolveTree(oldRefSpec);
    final RevTree newTree = resolveTree(newRefSpec);
    if (oldTree.equals(newTree)) {
        return Iterators.emptyIterator();
    }
    ObjectDatabase leftSource = resolveSource(oldTree.getId());
    ObjectDatabase rightSource = resolveSource(newTree.getId());
    final PreOrderDiffWalk visitor = new PreOrderDiffWalk(oldTree, newTree, leftSource, rightSource);
    final BlockingQueue<DiffEntry> queue = new ArrayBlockingQueue<>(100);
    final DiffEntryProducer diffProducer = new DiffEntryProducer(queue);
    diffProducer.setReportTrees(this.reportTrees);
    diffProducer.setRecursive(this.recursive);
    final List<RuntimeException> producerErrors = new LinkedList<>();
    Thread producerThread = new Thread("DiffTree producer thread") {

        @Override
        public void run() {
            Consumer consumer = diffProducer;
            if (customFilter != null) {
                // evaluated the latest
                consumer = new PreOrderDiffWalk.FilteringConsumer(consumer, customFilter);
            }
            if (changeTypeFilter != null) {
                consumer = new ChangeTypeFilteringDiffConsumer(changeTypeFilter, consumer);
            }
            if (boundsFilter != null) {
                consumer = new BoundsFilteringDiffConsumer(boundsFilter, consumer, stagingDatabase());
            }
            if (!pathFilters.isEmpty()) {
                // evaluated the former
                consumer = new PathFilteringDiffConsumer(pathFilters, consumer);
            }
            try {
                visitor.walk(consumer);
            } catch (RuntimeException e) {
                LOGGER.error("Error traversing diffs", e);
                producerErrors.add(e);
            } finally {
                diffProducer.finished = true;
            }
        }
    };
    producerThread.setDaemon(true);
    producerThread.start();
    Iterator<DiffEntry> consumerIterator = new AbstractIterator<DiffEntry>() {

        @Override
        protected DiffEntry computeNext() {
            if (!producerErrors.isEmpty()) {
                throw new RuntimeException("Error in producer thread", producerErrors.get(0));
            }
            BlockingQueue<DiffEntry> entries = queue;
            boolean finished = diffProducer.isFinished();
            boolean empty = entries.isEmpty();
            while (!finished || !empty) {
                try {
                    DiffEntry entry = entries.poll(10, TimeUnit.MILLISECONDS);
                    if (entry != null) {
                        return entry;
                    }
                    finished = diffProducer.isFinished();
                    empty = entries.isEmpty();
                } catch (InterruptedException e) {
                    throw Throwables.propagate(e);
                }
            }
            return endOfData();
        }

        @Override
        protected void finalize() {
            diffProducer.finished = true;
        }
    };
    return consumerIterator;
}