Examples of org.apache.jackrabbit.oak.stats.Clock$Virtual

org.apache.jackrabbit.oak.stats.Clock
A virtual clock that has no connection to the actual system time. Instead the clock maintains an internal counter that's incremented atomically whenever the current time is requested. This guarantees that the reported time signal is always strictly increasing.


    // OAK-2232
    @Test
    public void diffExternalChanges() throws Exception {
        long modifiedResMillis = SECONDS.toMillis(MODIFIED_IN_SECS_RESOLUTION);
        Clock clock = new Clock.Virtual();
        clock.waitUntil(System.currentTimeMillis());
        Revision.setClock(clock);


        DocumentStore docStore = new MemoryDocumentStore();
        DocumentNodeStore ns1 = new DocumentMK.Builder().setAsyncDelay(0)
                .clock(clock).setDocumentStore(docStore).setClusterId(1)
                .getNodeStore();
        DocumentNodeStore ns2 = new DocumentMK.Builder().setAsyncDelay(0)
                .clock(clock).setDocumentStore(docStore).setClusterId(2)
                .getNodeStore();


        NodeBuilder builder = ns1.getRoot().builder();
        NodeBuilder test = builder.child("test");
        for (int i = 0; i < DocumentMK.MANY_CHILDREN_THRESHOLD * 2; i++) {
            test.child("node-" + i);
        }
        ns1.merge(builder, EmptyHook.INSTANCE, CommitInfo.EMPTY);


        ns1.runBackgroundOperations();
        ns2.runBackgroundOperations();


        // make sure next change has a different _modified value
        clock.waitUntil(clock.getTime() + modifiedResMillis * 2);


        builder = ns2.getRoot().builder();
        builder.child("test").child("foo");
        ns2.merge(builder, EmptyHook.INSTANCE, CommitInfo.EMPTY);


        // 'wait' again for a different _modified value
        clock.waitUntil(clock.getTime() + modifiedResMillis * 2);


        builder = ns1.getRoot().builder();
        builder.child("test").child("bar");
        ns1.merge(builder, EmptyHook.INSTANCE, CommitInfo.EMPTY);

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    }


    // OAK-1814
    @Test
    public void visibilityAfterRevisionComparatorPurge() throws Exception {
        Clock clock = new Clock.Virtual();
        clock.waitUntil(System.currentTimeMillis());
        Revision.setClock(clock);
        MemoryDocumentStore docStore = new MemoryDocumentStore();
        DocumentNodeStore nodeStore1 = new DocumentMK.Builder()
                .setDocumentStore(docStore).setClusterId(1)
                .setAsyncDelay(0).clock(clock).getNodeStore();
        nodeStore1.runBackgroundOperations();
        DocumentNodeStore nodeStore2 = new DocumentMK.Builder()
                .setDocumentStore(docStore).setClusterId(2)
                .setAsyncDelay(0).clock(clock).getNodeStore();
        DocumentNodeStore nodeStore3 = new DocumentMK.Builder()
                .setDocumentStore(docStore).setClusterId(3)
                .setAsyncDelay(0).clock(clock).getNodeStore();


        NodeDocument doc = docStore.find(NODES, Utils.getIdFromPath("/"));
        assertNotNull(doc);
        Revision created = doc.getLocalDeleted().firstKey();
        assertEquals(1, created.getClusterId());


        clock.waitUntil(System.currentTimeMillis() +
                DocumentNodeStore.REMEMBER_REVISION_ORDER_MILLIS / 2);


        NodeBuilder builder = nodeStore2.getRoot().builder();
        builder.setProperty("prop", "value");
        nodeStore2.merge(builder, EmptyHook.INSTANCE, CommitInfo.EMPTY);
        nodeStore2.runBackgroundOperations();


        clock.waitUntil(System.currentTimeMillis() +
                DocumentNodeStore.REMEMBER_REVISION_ORDER_MILLIS + 1000);
        nodeStore3.runBackgroundOperations();


        doc = docStore.find(NODES, Utils.getIdFromPath("/"));
        assertNotNull(doc);

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        nodeStore3.dispose();
    }


    @Test
    public void modifiedReset() throws Exception {
        Clock clock = new Clock.Virtual();
        clock.waitUntil(System.currentTimeMillis());
        Revision.setClock(clock);
        MemoryDocumentStore docStore = new MemoryDocumentStore();
        DocumentNodeStore ns1 = new DocumentMK.Builder()
                .setDocumentStore(docStore).setClusterId(1)
                .setAsyncDelay(0).clock(clock).getNodeStore();
        NodeBuilder builder1 = ns1.getRoot().builder();
        builder1.child("node");
        ns1.merge(builder1, EmptyHook.INSTANCE, CommitInfo.EMPTY);
        ns1.runBackgroundOperations();


        DocumentNodeStore ns2 = new DocumentMK.Builder()
                .setDocumentStore(docStore).setClusterId(2)
                .setAsyncDelay(0).clock(clock).getNodeStore();


        NodeBuilder builder2 = ns2.getRoot().builder();
        builder2.child("node").child("child-2");
        ns2.merge(builder2, EmptyHook.INSTANCE, CommitInfo.EMPTY);


        // wait at least _modified resolution. in reality the wait may
        // not be necessary. e.g. when the clock passes the resolution boundary
        // exactly at this time
        clock.waitUntil(System.currentTimeMillis() +
                SECONDS.toMillis(MODIFIED_IN_SECS_RESOLUTION + 1));


        builder1 = ns1.getRoot().builder();
        builder1.child("node").child("child-1");
        ns1.merge(builder1, EmptyHook.INSTANCE, CommitInfo.EMPTY);

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