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.

        Long periodicity = 100L;
        Long rowKey = (Long.valueOf(evTime)/periodicity)*periodicity;
        String query = select().all().from(db, table).where(eq("key", String.valueOf(rowKey))).and(eq("column1",Long.valueOf(evTime)))
                .getQueryString();
        Cluster cluster = Cluster.builder().addContactPoints("localhost").build();
        Session session = cluster.connect(db);
        ResultSet rs = session.execute(query);
        return convertResultSet(rs);
    }

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          new PlainTextAuthProvider(cassandraKijiURI.getUsername(), cassandraKijiURI.getPassword())
      );
    }


    final Cluster cluster = clusterBuilder.build();
    final Session cassandraSession = cluster.connect();
    return new DefaultCassandraAdmin(cassandraSession, kijiURI);
  }

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        if (!classInformation.getSchema().equals("")) {
            getTemplate(classInformation.getSchema());


        }
        KeySpaceInformation key = classInformation.getKeySpace(getKeySpace());
        Session session = getCluster().connect(key.getKeySpace());
        return fixColumnFamily(session, familyColumn, entity);
  }

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        if (!classInformation.getSchema().equals("")) {
            getTemplate(classInformation.getSchema());


        }
        KeySpaceInformation key = classInformation.getKeySpace(getKeySpace());
        Session session = getCluster().connect(key.getKeySpace());
        classes.add(class1);
        return fixColumnFamily(session, familyColumn, class1);
    }

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    @Override
    public Persistence getPersistence(String keySpace) {


        if (!persistenceMap.containsKey(keySpace)) {
            Session session = getSession();
            if (!keySpaces.contains(keySpace)) {
                verifyKeySpace(keySpace, getSession());
                keySpaces.add(keySpace);
            }
            persistenceMap.put(keySpace, new PersistenceSimpleImpl(session,

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    public Persistence getPersistence(String host, String keySpace,
            ReplicaStrategy replicaStrategy, int factor) {


        if (!persistenceMap.containsKey(keySpace)) {
            Cluster cluter = Cluster.builder().addContactPoints(host).build();
            Session session = cluter.connect();
            if (!keySpace.contains(keySpace)) {
                verifyKeySpace(keySpace, cluter.connect(), replicaStrategy, factor);
                keySpaces.add(keySpace);
            }
            persistenceMap.put(keySpace, new PersistenceSimpleImpl(session,

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            getPersistence(classInformation.getSchema());


        }
        classes.add(class1);
        KeySpaceInformation key = classInformation.getKeySpace(keySpace);
        Session session = getCluster().connect(key.getKeySpace());
        return new FixColumnFamily().verifyColumnFamily(session, key.getKeySpace(),
                key.getColumnFamily(), class1);
    }

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    // PersistenceSession handling
    //
    ////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////


    @Override public Session driverSession() {
        Session s = session;
        if (s == null) {
            throw new PersistenceRuntimeException("not connected");
        }
        return s;
    }

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            if (!changed) {
                return null;
            }


            Session session = driverSession();
            BoundStatement bStmt = entity.updateBoundStatement(statementOptions, session, instance, binder);
            ExecutionTracer tracer = executionTracer(PersistenceSessionTrackingImpl.this, entity);
            return new ModifyFutureImpl<T>(PersistenceSessionTrackingImpl.this, tracer, null, session.executeAsync(bStmt), entity, instance,
                PersistMode.UPDATE);
        }

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    public PersistenceManager build() {
        if (model == null) {
            throw new NullPointerException();
        }


        Session s = session;
        boolean mySession = s == null;
        if (s == null && cluster != null) {
            s = cluster.connect();
        }

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