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

    private NodeState committed;


    KernelNodeStoreBranch(KernelNodeStore store) {
        this.store = store;


        MicroKernel kernel = store.getKernel();
        this.branchRevision = kernel.branch(null);
        this.currentRoot = new KernelNodeState(kernel, "/", branchRevision);
        this.base = currentRoot;
        this.committed = currentRoot;
    }

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        return true;
    }


    @Override
    public KernelNodeState merge() throws CommitFailedException {
        MicroKernel kernel = store.getKernel();
        CommitEditor editor = store.getEditor();


        NodeState oldRoot = base;
        NodeState toCommit = editor.editCommit(store, oldRoot, currentRoot);
        setRoot(toCommit);


        try {
            String mergedRevision = kernel.merge(branchRevision, null);
            branchRevision = null;
            currentRoot = null;
            committed = null;
            KernelNodeState committed = new KernelNodeState(kernel, "/", mergedRevision);
            return committed;

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        return node;
    }


    private void commit(String jsop) {
        MicroKernel kernel = store.getKernel();
        branchRevision = kernel.commit("/", jsop, branchRevision, null);
        currentRoot = new KernelNodeState(kernel, "/", branchRevision);
        committed = currentRoot;
    }

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public class SimpleKernelImplFixture implements MicroKernelFixture {


    @Override
    public void setUpCluster(MicroKernel[] cluster) {
        MicroKernel mk =
                new SimpleKernelImpl("mem:SimpleKernelImplFixture");
        for (int i = 0; i < cluster.length; i++) {
            cluster[i] = mk;
        }
    }

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    @Override
    public Object addingService(ServiceReference reference) {
        Object service = context.getService(reference);
        if (service instanceof MicroKernel) {
            MicroKernel kernel = (MicroKernel) service;
            services.put(reference, context.registerService(
                    ContentRepository.class.getName(),
                    new ContentRepositoryImpl(kernel, indexProvider, validatorProvider),
                    new Properties()));
            return service;

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public class MicroKernelImplFixture implements MicroKernelFixture {


    @Override
    public void setUpCluster(MicroKernel[] cluster) {
        MicroKernel mk = new MicroKernelImpl();
        for (int i = 0; i < cluster.length; i++) {
            cluster[i] = mk;
        }
    }

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            }
        }
    }


    private void addMount(String mount, String url, String[] paths) {
        MicroKernel mk = MicroKernelFactory.getInstance(url);
        mounts.put(mount, MicroKernelWrapperBase.wrap(mk));
        for (String p : paths) {
            dir.put(p, mount);
        }
    }

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            }
        }
        String revision = null;
        for (Entry<String, JsopWriter> e : builders.entrySet()) {
            String mount = e.getKey();
            MicroKernel m = mounts.get(mount);
            String jsop = e.getValue().toString();
            revision = m.commit("/", jsop, revisionId, message);
            revisions.put(mount, revision);
        }
        builders.clear();
        return getHeadRevision();
    }

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        String mount = getMount(path);
        if (mount == null) {
            throw ExceptionFactory.get("Not mapped: " + path);
        }
        String rev = getRevision(mount, revisionId);
        MicroKernel mk = mounts.get(mount);
        return mk.nodeExists(path, rev);
    }

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        String mount = getMount(path);
        if (mount == null) {
            throw ExceptionFactory.get("Not mapped: " + path);
        }
        String rev = getRevision(mount, revisionId);
        MicroKernel mk = mounts.get(mount);
        return mk.getChildNodeCount(path, rev);
    }

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