Examples of com.datastax.driver.core.Session

com.datastax.driver.core.Session
A session holds connections to a Cassandra cluster, allowing it to be queried. Each session maintains multiple connections to the cluster nodes, provides policies to choose which node to use for each query (round-robin on all nodes of the cluster by default), and handles retries for failed query (when it makes sense), etc...
Session instances are thread-safe and usually a single instance is enough per application. As a given session can only be "logged" into one keyspace at a time (where the "logged" keyspace is the one used by query if the query doesn't explicitely use a fully qualified table name), it can make sense to create one session per keyspace used. This is however not necessary to query multiple keyspaces since it is always possible to use a single session with fully qualified table name in queries.

        return comp;
    }


    @Test
    public void userTypeMeta() throws InterruptedException {
        Session session = cluster.connect();
        try {
            session.execute("CREATE TYPE udttest.phone ( cntry varchar, city varchar, num varchar )");
            session.execute("CREATE TYPE udttest.address ( street varchar, city varchar, country varchar, ph_num phone )");


            Thread.sleep(500L);


            KeyspaceMetadata ksm = cluster.getMetadata().getKeyspace("udttest");
            Collection<UserType> uts = ksm.getUserTypes();


            Assert.assertTrue(uts.size() >= 2);


            UserType utPhone = ksm.getUserType("phone");
            UserType utAddress = ksm.getUserType("address");


            Assert.assertNotNull(utPhone);
            Assert.assertNotNull(utAddress);
        } finally {session.close();}
    }

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            for (int i = 0; ; i++) {
                System.out.println("Building Cluster instance...");
                cluster = builder.build();


                try {
                    Session ignored = cluster.connect();
                    ignored.close();
                    break;
                } catch (Exception e) {
                    try {
                        cluster.close();
                    } catch (Throwable ignore) {

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    }


    @SuppressWarnings({"BusyWait", "CallToPrintStackTrace"}) protected static void recreateKeyspace(String keyspaceName) {
        System.out.println("Creating keyspace " + keyspaceName + " ...");
        for (int i = 0; ; i++) {
            Session session = null;
            try {
                session = cluster.connect();


                if (keyspaceExists(session, keyspaceName)) {
                    System.out.println("Dropping keyspace " + keyspaceName);
                    session.execute("DROP KEYSPACE " + keyspaceName).one();
                    for (int j = 0; j < 100; j++) {
                        if (!keyspaceExists(session, keyspaceName)) {
                            break;
                        }
                        try {
                            Thread.sleep(100);
                        } catch (InterruptedException e) {
                            e.printStackTrace();
                        }
                    }
                    if (keyspaceExists(session, keyspaceName)) {
                        Assert.fail("could not drop keyspace " + keyspaceName);
                    }
                }


                System.out.println("Creating keyspace " + keyspaceName);
                session
                    .execute("CREATE KEYSPACE " + keyspaceName + " WITH REPLICATION = { 'class' : 'SimpleStrategy', 'replication_factor' : 2 }")
                    .one();
                for (int j = 0; j < 100; j++) {
                    if (keyspaceExists(session, keyspaceName)) {
                        break;
                    }
                    try {
                        Thread.sleep(100);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                }
                if (!keyspaceExists(session, keyspaceName)) {
                    Assert.fail("could not drop keyspace " + keyspaceName);
                }
                return;
            } catch (NoHostAvailableException noHost) {
                try {
                    Thread.sleep(250L);
                } catch (InterruptedException e) {
                    throw new RuntimeException(e);
                }
                if (i == 5) {
                    throw noHost;
                }
            } finally { if (session!=null) session.close(); }
        }
    }

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        }
        MapEntity<?, ?> instance = (MapEntity) raw;


        persistOptions = withTTL(persistOptions);


        Session session = persistenceSession.driverSession();


        BatchStatement batch = new BatchStatement();


        //TODO adding a DELETE...WHERE partitionKey=? in front of INSERTs for the same partition key results in no insert at all *SICK*
        //Binder binder = new Binder(null, true, partitionKeyColumns, PersistMode.DELETE);

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        }
        MapEntity<?, ?> instance = (MapEntity) raw;


        persistOptions = withTTL(persistOptions);


        Session session = persistenceSession.driverSession();


        BatchStatement batch = new BatchStatement();


        Set removed = instance.getRemoved();
        if (!removed.isEmpty()) {

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        // WHERE row_specification
        // ( IF ( EXISTS | (column_name = literal ) ) AND ( column_name = literal ) . . . )


        persistOptions = withTTL(persistOptions);


        Session session = persistenceSession.driverSession();


        Binder binder = new Binder(null, true, partitionKeyColumns, PersistMode.DELETE, true);
        buildModifyBindColumns(instance, binder, partitionAttributes);
        BoundStatement bStmt = buildModifyInitial(session, persistOptions, PreparedStatements.StatementType.DELETE, binder);

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        Binder binder = new Binder(loadColumns, false, primaryKeyColumns, null, true);


        buildModifyBindColumns(container, binder);


        Session session = persistenceSession.driverSession();


        PreparedStatement pstmt = preparedStatements
            .statementFor(session, PreparedStatements.StatementType.SELECT, binder, persistOptions);
        BoundStatement bStmt = pstmt.bind();
        statementOptions.applyRead(bStmt, readConsistencyLevel, persistOptions);
        PersistOption.forBoundStatement(persistOptions, bStmt);


        int idx = binder.bindColumns(0, bStmt);


        PersistOption.LimitOption.apply(bStmt, persistOptions, idx);


        if (LOGGER.isDebugEnabled()) {
            LOGGER.debug("Lazy load of {} attributes for {}", attrs.length, type);
        }


        ResultSet resultSet = session.execute(bStmt);
        Row row = resultSet.one();
        if (row != null) {
            Retriever retriever = new GettableRetriever(persistenceSession.persistenceManager.protocolVersion, row, loadColumns);
            for (MappedAttribute attr : attrs) {
                Object instance = resolveParentInstance(container, attr);

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        Binder binder = new Binder(loadColumns, false, primaryKeyColumns, null, true);


        buildModifyBindColumns(container, binder);


        Session session = persistenceSession.driverSession();


        PreparedStatement pstmt = preparedStatements
            .statementFor(session, PreparedStatements.StatementType.SELECT, binder, persistOptions);
        BoundStatement bStmt = pstmt.bind();
        statementOptions.applyRead(bStmt, readConsistencyLevel, persistOptions);
        PersistOption.forBoundStatement(persistOptions, bStmt);


        int idx = binder.bindColumns(0, bStmt);


        PersistOption.LimitOption.apply(bStmt, persistOptions, idx);


        if (LOGGER.isDebugEnabled()) {
            LOGGER.debug("Lazy load of {} attributes for {}", attrs.length, type);
        }


        ResultSet resultSet = session.execute(bStmt);
        Row row = resultSet.one();
        if (row != null) {
            Retriever retriever = new GettableRetriever(persistenceSession.persistenceManager.protocolVersion, row, loadColumns);
            for (MappedAttribute attr : attrs) {
                Object instance = resolveParentInstance(container, attr);

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    }


    @Override public BatchFuture submitBatchAsync() {
        submitted = true;
        persistenceSession.statementOptions.applyWrite(batchStatement, null, null);
        Session session = persistenceSession.driverSession();
        if (LOGGER.isTraceEnabled()) {
            LOGGER.trace("Submitting batch bound statement {}", batchStatement);
        }


        for (BatchPartFutureImpl future : futures) {
            Interceptors preModify = future.mode == PersistMode.DELETE ? future.entity.preDelete : future.entity.prePersist;
            if (preModify != null) {
                preModify.invoke(future.instance, future.entity, future.mode);
            }
        }


        BatchFutureImpl future = new BatchFutureImpl(session.executeAsync(batchStatement));
        return future;
    }

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    CachedPreparedStatementCreator cpsc = new CachedPreparedStatementCreator(cql);


    PreparedStatement preparedStatement = cpsc.createPreparedStatement(getSession());
    addPreparedStatementOptions(preparedStatement, options);


    Session s = getSession();
    while (rowIterator.hasNext()) {
      s.executeAsync(preparedStatement.bind(rowIterator.next()));
    }
  }

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