Examples with MVStore org.h2.mvstore.MVStore used on opensource projects

Example 66 with MVStore

use of org.h2.mvstore.MVStore in project h2database by h2database.

the class TestOutOfMemory method testMVStoreUsingInMemoryFileSystem.

private void testMVStoreUsingInMemoryFileSystem() {
    FilePath.register(new FilePathMem());
    String fileName = "memFS:" + getTestName();
    final AtomicReference<Throwable> exRef = new AtomicReference<>();
    MVStore store = new MVStore.Builder().fileName(fileName).backgroundExceptionHandler(new Thread.UncaughtExceptionHandler() {

        @Override
        public void uncaughtException(Thread t, Throwable e) {
            exRef.compareAndSet(null, e);
        }
    }).open();
    try {
        Map<Integer, byte[]> map = store.openMap("test");
        Random r = new Random(1);
        try {
            for (int i = 0; i < 100; i++) {
                byte[] data = new byte[10 * 1024 * 1024];
                r.nextBytes(data);
                map.put(i, data);
            }
            Throwable throwable = exRef.get();
            if (throwable instanceof OutOfMemoryError)
                throw (OutOfMemoryError) throwable;
            if (throwable instanceof IllegalStateException)
                throw (IllegalStateException) throwable;
            fail();
        } catch (OutOfMemoryError | IllegalStateException e) {
        // expected
        }
        try {
            store.close();
        } catch (IllegalStateException e) {
        // expected
        }
        store.closeImmediately();
        store = MVStore.open(fileName);
        store.openMap("test");
        store.close();
    } finally {
        // just in case, otherwise if this test suffers a spurious failure,
        // succeeding tests will too, because they will OOM
        store.closeImmediately();
        FileUtils.delete(fileName);
    }
}

Example 67 with MVStore

use of org.h2.mvstore.MVStore in project georocket by georocket.

the class H2Store method close.

/**
 * Release all resources and close this store
 */
public void close() {
    MVStore s = mvstore.getAndSet(null);
    if (s != null) {
        s.close();
    }
    map = null;
}

Example 68 with MVStore

use of org.h2.mvstore.MVStore in project georocket by georocket.

the class H2Store method getMVStore.

/**
 * Get or create the H2 MVStore
 * @return the MVStore
 */
protected MVStore getMVStore() {
    MVStore result = mvstore.get();
    if (result == null) {
        synchronized (mvstore) {
            MVStore.Builder builder = new MVStore.Builder().fileName(path);
            if (compress) {
                builder = builder.compress();
            }
            result = builder.open();
            mvstore.set(result);
        }
    }
    return result;
}

Example 69 with MVStore

use of org.h2.mvstore.MVStore in project jackrabbit-oak by apache.

the class PersistentCache method createMapFactory.

private MapFactory createMapFactory(final int generation, final boolean readOnly) {
    MapFactory f = new MapFactory() {

        final String fileName = getFileName(generation);

        MVStore store;

        @Override
        void openStore() {
            if (store != null) {
                return;
            }
            MVStore.Builder builder = new MVStore.Builder();
            try {
                if (compress) {
                    builder.compress();
                }
                if (manualCommit) {
                    builder.autoCommitDisabled();
                }
                if (fileName != null) {
                    builder.fileName(fileName);
                }
                if (memCache >= 0) {
                    builder.cacheSize(memCache);
                }
                if (readOnly) {
                    builder.readOnly();
                }
                if (maxSizeMB < 10) {
                    builder.cacheSize(maxSizeMB);
                }
                if (autoCompact >= 0) {
                    builder.autoCompactFillRate(autoCompact);
                }
                builder.backgroundExceptionHandler(new Thread.UncaughtExceptionHandler() {

                    @Override
                    public void uncaughtException(Thread t, Throwable e) {
                        exceptionCount++;
                        LOG.debug("Error in the background thread of the persistent cache", e);
                        LOG.warn("Error in the background thread of the persistent cache: " + e);
                    }
                });
                store = builder.open();
                if (appendOnly) {
                    store.setReuseSpace(false);
                }
            } catch (Exception e) {
                exceptionCount++;
                LOG.warn("Could not open the store " + fileName, e);
            }
        }

        @Override
        synchronized void closeStore() {
            if (store == null) {
                return;
            }
            boolean compact = compactOnClose;
            try {
                if (store.getFileStore().isReadOnly()) {
                    compact = false;
                }
                // clear the interrupted flag, if set
                Thread.interrupted();
                store.close();
            } catch (Exception e) {
                exceptionCount++;
                LOG.debug("Could not close the store", e);
                LOG.warn("Could not close the store: " + e);
                store.closeImmediately();
            }
            if (compact) {
                try {
                    MVStoreTool.compact(fileName, true);
                } catch (Exception e) {
                    exceptionCount++;
                    LOG.debug("Could not compact the store", e);
                    LOG.warn("Could not compact the store: " + e);
                }
            }
            store = null;
        }

        @Override
        <K, V> Map<K, V> openMap(String name, Builder<K, V> builder) {
            try {
                if (builder == null) {
                    return store.openMap(name);
                }
                return store.openMap(name, builder);
            } catch (Exception e) {
                exceptionCount++;
                LOG.warn("Could not open the map", e);
                return null;
            }
        }

        @Override
        long getFileSize() {
            try {
                if (store == null) {
                    return 0;
                }
                FileStore fs = store.getFileStore();
                if (fs == null) {
                    return 0;
                }
                return fs.size();
            } catch (Exception e) {
                exceptionCount++;
                LOG.warn("Could not retrieve the map size", e);
                return 0;
            }
        }
    };
    f.openStore();
    return f;
}

Example 70 with MVStore

use of org.h2.mvstore.MVStore in project h2database by h2database.

the class Database method setWriteDelay.

public void setWriteDelay(int value) {
    writeDelay = value;
    if (writer != null) {
        writer.setWriteDelay(value);
        // TODO check if MIN_WRITE_DELAY is a good value
        flushOnEachCommit = writeDelay < Constants.MIN_WRITE_DELAY;
    }
    if (mvStore != null) {
        int millis = value < 0 ? 0 : value;
        mvStore.getStore().setAutoCommitDelay(millis);
    }
}