Examples of org.apache.cassandra.cql3.QueryHandler

org.apache.cassandra.cql3.operations.Operation

    }


    public static InetAddress getPreferredIP(InetAddress ep)
    {
        String req = "SELECT preferred_ip FROM system.%s WHERE peer='%s'";
        UntypedResultSet result = processInternal(String.format(req, PEERS_CF, ep.getHostAddress()));
        if (!result.isEmpty() && result.one().has("preferred_ip"))
            return result.one().getInetAddress("preferred_ip");
        return null;
    }

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            throw ex;
        }
        ColumnFamilyStore cfs = keyspace.getColumnFamilyStore(LOCAL_CF);


        String req = "SELECT cluster_name FROM system.%s WHERE key='%s'";
        UntypedResultSet result = processInternal(String.format(req, LOCAL_CF, LOCAL_KEY));


        if (result.isEmpty() || !result.one().has("cluster_name"))
        {
            // this is a brand new node
            if (!cfs.getSSTables().isEmpty())
                throw new ConfigurationException("Found system keyspace files, but they couldn't be loaded!");


            // no system files.  this is a new node.
            req = "INSERT INTO system.%s (key, cluster_name) VALUES ('%s', '%s')";
            processInternal(String.format(req, LOCAL_CF, LOCAL_KEY, DatabaseDescriptor.getClusterName()));
            return;
        }


        String savedClusterName = result.one().getString("cluster_name");
        if (!DatabaseDescriptor.getClusterName().equals(savedClusterName))
            throw new ConfigurationException("Saved cluster name " + savedClusterName + " != configured name " + DatabaseDescriptor.getClusterName());
    }

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    }


    public static Collection<Token> getSavedTokens()
    {
        String req = "SELECT tokens FROM system.%s WHERE key='%s'";
        UntypedResultSet result = processInternal(String.format(req, LOCAL_CF, LOCAL_KEY));
        return result.isEmpty() || !result.one().has("tokens")
             ? Collections.<Token>emptyList()
             : deserializeTokens(result.one().<String>getSet("tokens", UTF8Type.instance));
    }

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    }


    public static int incrementAndGetGeneration()
    {
        String req = "SELECT gossip_generation FROM system.%s WHERE key='%s'";
        UntypedResultSet result = processInternal(String.format(req, LOCAL_CF, LOCAL_KEY));


        int generation;
        if (result.isEmpty() || !result.one().has("gossip_generation"))
        {
            // seconds-since-epoch isn't a foolproof new generation
            // (where foolproof is "guaranteed to be larger than the last one seen at this ip address"),
            // but it's as close as sanely possible
            generation = (int) (System.currentTimeMillis() / 1000);
        }
        else
        {
            // Other nodes will ignore gossip messages about a node that have a lower generation than previously seen.
            final int storedGeneration = result.one().getInt("gossip_generation") + 1;
            final int now = (int) (System.currentTimeMillis() / 1000);
            if (storedGeneration >= now)
            {
                logger.warn("Using stored Gossip Generation {} as it is greater than current system time {}.  See CASSANDRA-3654 if you experience problems",
                            storedGeneration, now);

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    }


    public static BootstrapState getBootstrapState()
    {
        String req = "SELECT bootstrapped FROM system.%s WHERE key='%s'";
        UntypedResultSet result = processInternal(String.format(req, LOCAL_CF, LOCAL_KEY));


        if (result.isEmpty() || !result.one().has("bootstrapped"))
            return BootstrapState.NEEDS_BOOTSTRAP;


        return BootstrapState.valueOf(result.one().getString("bootstrapped"));
    }

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    public static UUID getLocalHostId()
    {
        UUID hostId = null;


        String req = "SELECT host_id FROM system.%s WHERE key='%s'";
        UntypedResultSet result = processInternal(String.format(req, LOCAL_CF, LOCAL_KEY));


        // Look up the Host UUID (return it if found)
        if (!result.isEmpty() && result.one().has("host_id"))
        {
            return result.one().getUUID("host_id");
        }


        // ID not found, generate a new one, persist, and then return it.
        hostId = UUID.randomUUID();
        logger.warn("No host ID found, created {} (Note: This should happen exactly once per node).", hostId);

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    }


    public static PaxosState loadPaxosState(ByteBuffer key, CFMetaData metadata)
    {
        String req = "SELECT * FROM system.%s WHERE row_key = 0x%s AND cf_id = %s";
        UntypedResultSet results = processInternal(String.format(req, PAXOS_CF, ByteBufferUtil.bytesToHex(key), metadata.cfId));
        if (results.isEmpty())
            return new PaxosState(key, metadata);
        UntypedResultSet.Row row = results.one();
        Commit inProgress = new Commit(key,
                                       row.getUUID("in_progress_ballot"),
                                       row.has("proposal") ? ColumnFamily.fromBytes(row.getBytes("proposal")) : EmptyColumns.factory.create(metadata));
        // either most_recent_commit and most_recent_commit_at will both be set, or neither
        Commit mostRecent = row.has("most_recent_commit")

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                            else
                            {
                                builder.add(column.name.key);
                                List<Term> args = Collections.singletonList(keySelected);


                                Operation op;
                                switch (validator.kind)
                                {
                                    case LIST:
                                        op = ListOperation.DiscardKey(args);
                                        break;
                                    case SET:
                                        op = SetOperation.Discard(args);
                                        break;
                                    case MAP:
                                        op = MapOperation.DiscardKey(keySelected);
                                        break;
                                    default:
                                        throw new InvalidRequestException("Unknown collection type: " + validator.kind);
                                }


                                op.execute(cf, builder, validator, params, group == null ? null : group.getCollection(column.name.key));
                            }
                        }
                        else
                        {
                            ColumnNameBuilder b = iter.hasNext() ? builder.copy() : builder;

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        // Lists SET operation incurs a read.
        Set<ByteBuffer> toRead = null;
        for (Map.Entry<CFDefinition.Name, Operation> entry : processedColumns.entries())
        {
            CFDefinition.Name name = entry.getKey();
            Operation value = entry.getValue();


            if (!(name.type instanceof ListType))
                continue;


            if (value.requiresRead(name.type))
            {
                if (toRead == null)
                    toRead = new TreeSet<ByteBuffer>(UTF8Type.instance);
                toRead.add(name.name.key);
            }

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        if (cfDef.isCompact)
        {
            if (builder.componentCount() == 0)
                throw new InvalidRequestException(String.format("Missing PRIMARY KEY part %s", cfDef.columns.values().iterator().next()));


            Operation operation;
            if (cfDef.value == null)
            {
                // No value was defined, we set to the empty value
                operation = ColumnOperation.SetToEmpty();
            }
            else
            {
                List<Operation> operations = processedColumns.get(cfDef.value);
                if (operations.isEmpty())
                    throw new InvalidRequestException(String.format("Missing mandatory column %s", cfDef.value));
                assert operations.size() == 1;
                operation = operations.get(0);
            }
            operation.execute(cf, builder.copy(), cfDef.value == null ? null : cfDef.value.type, params, null);
        }
        else
        {
            for (Map.Entry<CFDefinition.Name, Operation> entry : processedColumns.entries())
            {
                CFDefinition.Name name = entry.getKey();
                Operation op = entry.getValue();
                op.execute(cf, builder.copy().add(name.name.key), name.type, params, group == null || !op.requiresRead(name.type) ? null : group.getCollection(name.name.key));
            }
        }


        return type == Type.COUNTER ? new CounterMutation(rm, cl) : rm;
    }

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