Java UntypedResultSet.one方法代码示例

import org.apache.cassandra.cql3.UntypedResultSet; //导入方法依赖的package包/类
public static PaxosState loadPaxosState(ByteBuffer key, CFMetaData metadata)
{
    String req = "SELECT * FROM system.%s WHERE row_key = ? AND cf_id = ?";
    UntypedResultSet results = executeInternal(String.format(req, PAXOS_CF), key, metadata.cfId);
    if (results.isEmpty())
        return new PaxosState(key, metadata);
    UntypedResultSet.Row row = results.one();
    Commit promised = row.has("in_progress_ballot")
                    ? new Commit(key, row.getUUID("in_progress_ballot"), ArrayBackedSortedColumns.factory.create(metadata))
                    : Commit.emptyCommit(key, metadata);
    // either we have both a recently accepted ballot and update or we have neither
    Commit accepted = row.has("proposal")
                    ? new Commit(key, row.getUUID("proposal_ballot"), ColumnFamily.fromBytes(row.getBytes("proposal")))
                    : Commit.emptyCommit(key, metadata);
    // either most_recent_commit and most_recent_commit_at will both be set, or neither
    Commit mostRecent = row.has("most_recent_commit")
                      ? new Commit(key, row.getUUID("most_recent_commit_at"), ColumnFamily.fromBytes(row.getBytes("most_recent_commit")))
                      : Commit.emptyCommit(key, metadata);
    return new PaxosState(promised, accepted, mostRecent);
}
 

import org.apache.cassandra.cql3.UntypedResultSet; //导入方法依赖的package包/类
public static Map<UUID, Pair<ReplayPosition, Long>> getTruncationRecords()
{
    String req = "SELECT truncated_at FROM system.%s WHERE key = '%s'";
    UntypedResultSet rows = processInternal(String.format(req, LOCAL_CF, LOCAL_KEY));
    if (rows.isEmpty())
        return Collections.emptyMap();

    UntypedResultSet.Row row = rows.one();
    Map<UUID, ByteBuffer> rawMap = row.getMap("truncated_at", UUIDType.instance, BytesType.instance);
    if (rawMap == null)
        return Collections.emptyMap();

    Map<UUID, Pair<ReplayPosition, Long>> positions = new HashMap<UUID, Pair<ReplayPosition, Long>>();
    for (Map.Entry<UUID, ByteBuffer> entry : rawMap.entrySet())
        positions.put(entry.getKey(), truncationRecordFromBlob(entry.getValue()));
    return positions;
}
 

import org.apache.cassandra.cql3.UntypedResultSet; //导入方法依赖的package包/类
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 promised = new Commit(key, row.getUUID("in_progress_ballot"), EmptyColumns.factory.create(metadata));
    // either we have both a recently accepted ballot and update or we have neither
    Commit accepted = row.has("proposal")
                    ? new Commit(key, row.getUUID("proposal_ballot"), ColumnFamily.fromBytes(row.getBytes("proposal")))
                    : Commit.emptyCommit(key, metadata);
    // either most_recent_commit and most_recent_commit_at will both be set, or neither
    Commit mostRecent = row.has("most_recent_commit")
                      ? new Commit(key, row.getUUID("most_recent_commit_at"), ColumnFamily.fromBytes(row.getBytes("most_recent_commit")))
                      : Commit.emptyCommit(key, metadata);
    return new PaxosState(promised, accepted, mostRecent);
}
 

import org.apache.cassandra.cql3.UntypedResultSet; //导入方法依赖的package包/类
/**
 * Returns a RestorableMeter tracking the average read rate of a particular SSTable, restoring the last-seen rate
 * from values in system.sstable_activity if present.
 * @param keyspace the keyspace the sstable belongs to
 * @param table the table the sstable belongs to
 * @param generation the generation number for the sstable
 */
public static RestorableMeter getSSTableReadMeter(String keyspace, String table, int generation)
{
    String cql = "SELECT * FROM %s WHERE keyspace_name='%s' and columnfamily_name='%s' and generation=%d";
    UntypedResultSet results = processInternal(String.format(cql,
                                                             SSTABLE_ACTIVITY_CF,
                                                             keyspace,
                                                             table,
                                                             generation));

    if (results.isEmpty())
        return new RestorableMeter();

    UntypedResultSet.Row row = results.one();
    double m15rate = row.getDouble("rate_15m");
    double m120rate = row.getDouble("rate_120m");
    return new RestorableMeter(m15rate, m120rate);
}
 

import org.apache.cassandra.cql3.UntypedResultSet; //导入方法依赖的package包/类
private void replayBatch(UUID id)
{
    logger.debug("Replaying batch {}", id);

    UntypedResultSet result = process("SELECT written_at, data FROM %s.%s WHERE id = %s", Keyspace.SYSTEM_KS, SystemKeyspace.BATCHLOG_CF, id);
    if (result.isEmpty())
        return;

    try
    {
        UntypedResultSet.Row batch = result.one();
        replaySerializedMutations(batch.getBytes("data"), batch.getLong("written_at"));
    }
    catch (IOException e)
    {
        logger.warn("Skipped batch replay of {} due to {}", id, e);
    }

    process("DELETE FROM %s.%s WHERE id = %s", Keyspace.SYSTEM_KS, SystemKeyspace.BATCHLOG_CF, id);

    totalBatchesReplayed.incrementAndGet();
}
 

import org.apache.cassandra.cql3.UntypedResultSet; //导入方法依赖的package包/类
public static Pair<Integer, Token> getViewBuildStatus(String ksname, String viewName)
{
    String req = "SELECT generation_number, last_token FROM system.%s WHERE keyspace_name = ? AND view_name = ?";
    UntypedResultSet queryResultSet = executeInternal(String.format(req, VIEWS_BUILDS_IN_PROGRESS), ksname, viewName);
    if (queryResultSet == null || queryResultSet.isEmpty())
        return null;

    UntypedResultSet.Row row = queryResultSet.one();

    Integer generation = null;
    Token lastKey = null;
    if (row.has("generation_number"))
        generation = row.getInt("generation_number");
    if (row.has("last_key"))
    {
        Token.TokenFactory factory = ViewsBuildsInProgress.partitioner.getTokenFactory();
        lastKey = factory.fromString(row.getString("last_key"));
    }

    return Pair.create(generation, lastKey);
}
 

import org.apache.cassandra.cql3.UntypedResultSet; //导入方法依赖的package包/类
public static PaxosState loadPaxosState(DecoratedKey key, CFMetaData metadata, int nowInSec)
{
    String req = "SELECT * FROM system.%s WHERE row_key = ? AND cf_id = ?";
    UntypedResultSet results = QueryProcessor.executeInternalWithNow(nowInSec, String.format(req, PAXOS), key.getKey(), metadata.cfId);
    if (results.isEmpty())
        return new PaxosState(key, metadata);
    UntypedResultSet.Row row = results.one();
    Commit promised = row.has("in_progress_ballot")
                    ? new Commit(row.getUUID("in_progress_ballot"), new PartitionUpdate(metadata, key, metadata.partitionColumns(), 1))
                    : Commit.emptyCommit(key, metadata);
    // either we have both a recently accepted ballot and update or we have neither
    int proposalVersion = row.has("proposal_version") ? row.getInt("proposal_version") : MessagingService.VERSION_21;
    Commit accepted = row.has("proposal")
                    ? new Commit(row.getUUID("proposal_ballot"), PartitionUpdate.fromBytes(row.getBytes("proposal"), proposalVersion, key))
                    : Commit.emptyCommit(key, metadata);
    // either most_recent_commit and most_recent_commit_at will both be set, or neither
    int mostRecentVersion = row.has("most_recent_commit_version") ? row.getInt("most_recent_commit_version") : MessagingService.VERSION_21;
    Commit mostRecent = row.has("most_recent_commit")
                      ? new Commit(row.getUUID("most_recent_commit_at"), PartitionUpdate.fromBytes(row.getBytes("most_recent_commit"), mostRecentVersion, key))
                      : Commit.emptyCommit(key, metadata);
    return new PaxosState(promised, accepted, mostRecent);
}
 

import org.apache.cassandra.cql3.UntypedResultSet; //导入方法依赖的package包/类
/**
 * Returns a RestorableMeter tracking the average read rate of a particular SSTable, restoring the last-seen rate
 * from values in system.sstable_activity if present.
 * @param keyspace the keyspace the sstable belongs to
 * @param table the table the sstable belongs to
 * @param generation the generation number for the sstable
 */
public static RestorableMeter getSSTableReadMeter(String keyspace, String table, int generation)
{
    String cql = "SELECT * FROM system.%s WHERE keyspace_name=? and columnfamily_name=? and generation=?";
    UntypedResultSet results = executeInternal(String.format(cql, SSTABLE_ACTIVITY_CF), keyspace, table, generation);

    if (results.isEmpty())
        return new RestorableMeter();

    UntypedResultSet.Row row = results.one();
    double m15rate = row.getDouble("rate_15m");
    double m120rate = row.getDouble("rate_120m");
    return new RestorableMeter(m15rate, m120rate);
}
 

import org.apache.cassandra.cql3.UntypedResultSet; //导入方法依赖的package包/类
/**
 * Returns a RestorableMeter tracking the average read rate of a particular SSTable, restoring the last-seen rate
 * from values in system.sstable_activity if present.
 * @param keyspace the keyspace the sstable belongs to
 * @param table the table the sstable belongs to
 * @param generation the generation number for the sstable
 */
public static RestorableMeter getSSTableReadMeter(String keyspace, String table, int generation)
{
    String cql = "SELECT * FROM system.%s WHERE keyspace_name=? and columnfamily_name=? and generation=?";
    UntypedResultSet results = executeInternal(String.format(cql, SSTABLE_ACTIVITY), keyspace, table, generation);

    if (results.isEmpty())
        return new RestorableMeter();

    UntypedResultSet.Row row = results.one();
    double m15rate = row.getDouble("rate_15m");
    double m120rate = row.getDouble("rate_120m");
    return new RestorableMeter(m15rate, m120rate);
}