Examples of org.apache.cayenne.access.DataContext

org.apache.cayenne.access.DataContext
Class that provides applications with access to Cayenne persistence features. In most cases this is the only access class directly used in the application.
Most common DataContext use pattern is to create one DataContext per session. "Session" may be a an HttpSession in a web application, or any other similar concept in a multiuser application.

DataObjects are registered with DataContext either implicitly when they are fetched via a query, or read via a relationship from another object, or explicitly via calling {@link #createAndRegisterNewObject(Class)}during new DataObject creation. DataContext tracks changes made to its DataObjects in memory, and flushes them to the database when {@link #commitChanges()}is called. Until DataContext is committed, changes made to its objects are not visible in other DataContexts.

Each DataObject can belong only to a single DataContext. To create a replica of an object from a different DataContext in a local context, use {@link #localObject(ObjectId,Persistent)} method.
For more information see Cayenne User Guide.

Note that all QueryEngine interface methods are deprecated in the DataContext. Since 1.2 release DataContext implements ObjectContext and DataChannel interfaces.
@author Andrus Adamchik


        }
    }


    public void testToManyTargetDifferentContext() throws Exception {
        DataContext context1 = createDataContext();
        Painting doC1 = context1.newObject(Painting.class);


        DataContext context2 = createDataContext();
        Artist doC2 = context2.newObject(Artist.class);


        // this is the case where exception must be thrown as DataContexts are
        // different
        try {
            doC2.addToManyTarget(Artist.PAINTING_ARRAY_PROPERTY, doC1, false);

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    protected DataContext getDataContext() {
        try {
            return (DataContext) BaseContext.getThreadObjectContext();


        } catch (IllegalStateException ise) {
            DataContext dataContext = DataContext.createDataContext();
            BaseContext.bindThreadObjectContext(dataContext);
            return dataContext;
        }
    }

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        if (request instanceof HttpServletRequest) {
            reset = true;


            HttpSession session = ((HttpServletRequest) request).getSession(true);
            DataContext context = ServletUtil.getSessionContext(session);
            DataContext.bindThreadDataContext(context);
        }


        try {
            chain.doFilter(request, response);

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    protected DataContext getDataContext() {
        try {
            return (DataContext) BaseContext.getThreadObjectContext();


        } catch (IllegalStateException ise) {
            DataContext dataContext = DataContext.createDataContext();
            BaseContext.bindThreadObjectContext(dataContext);
            return dataContext;
        }
    }

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        ServerRuntime runtime = new ServerRuntime("Yuis", module);
        assertSame(channel, runtime.getChannel());
    }


    public void testGetObjectContext_CustomModule() {
        final ObjectContext context = new DataContext();
        final ObjectContextFactory factory = new ObjectContextFactory() {


            public ObjectContext createContext(DataChannel parent) {
                return context;
            }

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                .getSharedSnapshotCache() : new DataRowStore(
                dataDomain.getName(),
                dataDomain.getProperties(),
                eventManager);


        DataContext context = new DataContext(
                parent, objectStoreFactory.createObjectStore(snapshotCache));
        context.setValidatingObjectsOnCommit(dataDomain.isValidatingObjectsOnCommit());
        context.setQueryCache(new NestedQueryCache(queryCache));
        return context;
    }

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    protected ObjectContext createFromDataContext(DataContext parent) {
        // child ObjectStore should not have direct access to snapshot cache, so do not
        // pass it in constructor.
        ObjectStore objectStore = objectStoreFactory.createObjectStore(null);


        DataContext context = new DataContext(parent, objectStore);


        context.setValidatingObjectsOnCommit(parent.isValidatingObjectsOnCommit());
        context.setUsingSharedSnapshotCache(parent.isUsingSharedSnapshotCache());
        context.setQueryCache(new NestedQueryCache(queryCache));


        return context;
    }

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        // it makes it easier to track the event subject
        DataRowStore snapshotCache = (parent.isSharedCacheEnabled()) ? parent
                .getSharedSnapshotCache() : new DataRowStore(parent.getName(), parent
                .getProperties(), eventManager);


        DataContext context = new DataContext(
                parent, objectStoreFactory.createObjectStore(snapshotCache));
        context.setValidatingObjectsOnCommit(parent.isValidatingObjectsOnCommit());
        context.setQueryCache(new NestedQueryCache(queryCache));
        return context;
    }

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  @Override
  protected Void doInBackground() throws Exception {
    publish("Loading connection");


    DataContext context = DataContext.createDataContext();


    controller.getLibraryManager().setContext(context);
    
    publish("Initiailizing library manager");

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        if (request instanceof HttpServletRequest) {
            reset = true;


            HttpSession session = ((HttpServletRequest) request).getSession(true);
            DataContext context = ServletUtil.getSessionContext(session);
            BaseContext.bindThreadObjectContext(context);
        }


        try {
            chain.doFilter(request, response);

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