Examples of MicroKernel

org.apache.jackrabbit.mk.api.MicroKernel
The MicroKernel Design Goals and Principles:
- manage huge trees of nodes and properties efficiently
- MVCC-based concurrency control (writers don't interfere with readers, snapshot isolation)
- GIT/SVN-inspired DAG-based versioning model
- highly scalable concurrent read & write operations
- session-less API (there's no concept of sessions; an implementation doesn't need to track/manage session state)
- easily portable to C
- easy to remote
- efficient support for large number of child nodes
- integrated API for efficiently storing/retrieving large binaries
- human-readable data serialization (JSON)
The MicroKernel Data Model:
- simple JSON-inspired data model: just nodes and properties
- a node consists of an unordered set of name -> item mappings. each property and child node is uniquely named and a single name can only refer to a property or a child node, not both at the same time.
- properties are represented as name/value pairs
- supported property types: string, number, boolean, array
- a property value is stored and used as an opaque, unparsed character sequence
The Retention Policy for Revisions:
TODO specify retention policy for old revisions, i.e. minimal guaranteed retention period (OAK-114)

The Retention Policy for Binaries:

The MicroKernel implementation is free to remove binaries if both of the following conditions are met:
- If the binary is not references as a property value of the format ":blobId:<blobId>" where <blobId> is the id returned by {@link #write(InputStream in)}. This includes simple property values such as {"bin": ":blobId:1234"} as well as array property values such as {"array": [":blobId:1234", ":blobId:5678"]}.
- If the binary was stored before the last retained revision (this is to keep temporary binaries, and binaries that are not yet referenced).

Examples of org.apache.jackrabbit.mk.api.MicroKernel


    private NodeStore store;


    @Before
    public void setUp() throws Exception {
        MicroKernel microKernel = new MicroKernelImpl();
        String jsop = "^\"a\":1 ^\"b\":2 ^\"c\":3 +\"x\":{} +\"y\":{} +\"z\":{} " +
                "+\"oak:index\":{\"solrIdx\":{\"coreName\":\"cn\", \"solrHomePath\":\"sh\", \"solrConfigPath\":\"sc\"}} ";
        microKernel.commit("/", jsop, microKernel.getHeadRevision(), "test data");
        store = new KernelNodeStore(microKernel);
    }

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Examples of org.apache.jackrabbit.mk.api.MicroKernel


    private KernelNodeStore store;


    @Before
    public void setup() {
        MicroKernel mk = new MicroKernelImpl();
        store = new KernelNodeStore(mk);
        // initialize node types & index definitions
        OakInitializer.initialize(store, new InitialContent(),
                CompositeIndexEditorProvider
                        .compose(new ArrayList<IndexEditorProvider>()));

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Examples of org.apache.jackrabbit.mk.api.MicroKernel


    @Test
    @Ignore("OAK-532")  // FIXME OAK-532
    public void journalConsistency() throws Exception {
        while (true) {
            final MicroKernel mk1 = new MicroKernelImpl();
            final String rev = mk1.commit("", "+\"/a\":{}", null, null);


            Thread t1 = new Thread("t1") {
                @Override
                public void run() {
                    try {
                        String r2 = mk1.commit("", "-\"/a\"+\"/c\":{}", rev, null);
                    }
                    catch (MicroKernelException ignore) { }
                }
            };
            Thread t2 = new Thread("t2") {
                @Override
                public void run() {
                    try {
                        String r2 = mk1.commit("", "-\"/a\"+\"/b\":{}", rev, null);
                    }
                    catch (MicroKernelException ignore) { }
                }
            };


            t1.start();
            t2.start();


            t1.join();
            t2.join();


            String journal = mk1.getJournal(rev, null, null);
            int c = count("-\\\"/a\\", journal);
            assertEquals(1, c);
        }
    }

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Examples of org.apache.jackrabbit.mk.api.MicroKernel

        assertTrue(after - before < 10); 
    }


    private ScheduledFuture<String> scheduleCommit(long delay, final String revisionId) {
        ScheduledExecutorService executorService = Executors.newSingleThreadScheduledExecutor();
        final MicroKernel mk = this.mk;
        ScheduledFuture<String> future = executorService.schedule(new Callable<String>(){
            @Override
            public String call() throws Exception {
                return mk.commit("/", "+\"b\" : {}", revisionId, null);
            }
        }, delay, TimeUnit.MILLISECONDS);
        executorService.shutdown();
        return future;
    }

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Examples of org.apache.jackrabbit.mk.api.MicroKernel

    public static RepositoryFixture getMemory(final long cacheSize) {
        return new OakRepositoryFixture("Oak-Memory") {
            @Override
            protected Repository[] internalSetUpCluster(int n) throws Exception {
                Repository[] cluster = new Repository[n];
                MicroKernel kernel = new MicroKernelImpl();
                for (int i = 0; i < cluster.length; i++) {
                    Oak oak = new Oak(new KernelNodeStore(kernel, cacheSize));
                    cluster[i] = new Jcr(oak).createRepository();
                }
                return cluster;

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Examples of org.apache.jackrabbit.mk.api.MicroKernel


    private NodeStore store;


    @Before
    public void setUp() throws Exception {
        MicroKernel microKernel = new MicroKernelImpl();
        String jsop = "^\"a\":1 ^\"b\":2 ^\"c\":3 +\"x\":{} +\"y\":{} +\"z\":{} " +
                "+\"oak:index\":{\"solrIdx\":{\"coreName\":\"cn\", \"solrHome\":\"sh\", \"solrConfig\":\"sc\"}} ";
        microKernel.commit("/", jsop, microKernel.getHeadRevision(), "test data");
        store = new KernelNodeStore(microKernel);
    }

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Examples of org.apache.jackrabbit.mk.api.MicroKernel

    public void testConcurrentAdd() throws Exception {
        // create workers
        List<Callable<String>> cs = new LinkedList<Callable<String>>();
        for (int i = 0; i < NB_THREADS; i++) {
            // each callable has its own microkernel
            final MicroKernel mk = createMicroKernel();
            // diff for adding one node and one child node
            final List<String> stmts = new LinkedList<String>();
            stmts.add("+\"node" + i + "\":{}");
            stmts.add("+\"node" + i + "/child\":{}");
            // create callable
            Callable<String> c = new Callable<String>() {
                @Override
                public String call() throws Exception {
                    // commit all statements, one at a time
                    String r = null;
                    for (String stmt : stmts) {
                        r = mk.commit("/", stmt, null, "msg");
                    }
                    return r;
                }
            };
            cs.add(c);

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Examples of org.apache.jackrabbit.mk.api.MicroKernel

        assertTrue(after - before < 10); 
    }


    private ScheduledFuture<String> scheduleCommit(long delay, final String revisionId) {
        ScheduledExecutorService executorService = Executors.newSingleThreadScheduledExecutor();
        final MicroKernel mk = this.mk;
        ScheduledFuture<String> future = executorService.schedule(new Callable<String>(){
            @Override
            public String call() throws Exception {
                return mk.commit("/", "+\"b\" : {}", revisionId, null);
            }
        }, delay, TimeUnit.MILLISECONDS);
        executorService.shutdown();
        return future;
    }

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Examples of org.apache.jackrabbit.mk.api.MicroKernel


    @Override
    public Object addingService(ServiceReference reference) {
        Object service = context.getService(reference);
        if (service instanceof MicroKernel) {
            MicroKernel kernel = (MicroKernel) service;
            services.put(reference, context.registerService(
                    NodeStore.class.getName(),
                    new KernelNodeStore(kernel),
                    new Properties()));
        } else if (service instanceof NodeStore) {

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Examples of org.apache.jackrabbit.mk.api.MicroKernel

        }
        return node;
    }


    private void commit(String jsop) {
        MicroKernel kernel = store.getKernel();
        if (headRevision == null) {
            // create the branch if this is the first commit
            headRevision = kernel.branch(base.getRevision());
        }


        // persist transient changes first
        persistTransientHead();


        headRevision = kernel.commit("", jsop, headRevision, null);
        head = store.getRootState(headRevision);
    }

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