Java KeyspaceDefinition.getColumnFamily方法代码示例

import com.netflix.astyanax.ddl.KeyspaceDefinition; //导入方法依赖的package包/类
protected <C> ColumnFamily<ByteBuffer, C> getColumnFamily(KeyspaceDefinition keyspaceDef,
                                                          String prefix, String suffix, String placement,
                                                          Serializer<C> columnSerializer) throws IllegalArgumentException {
    // Create the column family object.  It must be keyed by a ByteBuffer because that's what
    // the AstyanaxTable.getRowKey() method returns.
    ColumnFamily<ByteBuffer, C> cf = new ColumnFamily<>(prefix + "_" + suffix,
            ByteBufferSerializer.get(), columnSerializer);

    // Verify that the column family exists in the Cassandra schema.
    ColumnFamilyDefinition cfDef = keyspaceDef.getColumnFamily(cf.getName());
    if (cfDef == null) {
        throw new UnknownPlacementException(format(
                "Placement string '%s' refers to unknown Cassandra %s column family in keyspace '%s': %s",
                placement, suffix, keyspaceDef.getName(), cf.getName()), placement);
    }
    return cf;
}
 

import com.netflix.astyanax.ddl.KeyspaceDefinition; //导入方法依赖的package包/类
@Override
public Map<String, String> getCompressionOptions(String cf) throws BackendException {
    try {
        Keyspace k = keyspaceContext.getClient();

        KeyspaceDefinition kdef = k.describeKeyspace();

        if (null == kdef) {
            throw new PermanentBackendException("Keyspace " + k.getKeyspaceName() + " is undefined");
        }

        ColumnFamilyDefinition cfdef = kdef.getColumnFamily(cf);

        if (null == cfdef) {
            throw new PermanentBackendException("Column family " + cf + " is undefined");
        }

        return cfdef.getCompressionOptions();
    } catch (ConnectionException e) {
        throw new PermanentBackendException(e);
    }
}
 

import com.netflix.astyanax.ddl.KeyspaceDefinition; //导入方法依赖的package包/类
/**
 * Check if the column family exists.  If it dosn't create it
 */
private void testAndCreateColumnFamilyDef( MultiTenantColumnFamilyDefinition columnFamily )
        throws ConnectionException {
    final KeyspaceDefinition keyspaceDefinition = keyspace.describeKeyspace();

    final ColumnFamilyDefinition existing =
            keyspaceDefinition.getColumnFamily( columnFamily.getColumnFamily().getName() );

    if ( existing != null ) {
        logger.info("Not creating columnfamily {}, it already exists.", columnFamily.getColumnFamily().getName());
        return;
    }

    keyspace.createColumnFamily( columnFamily.getColumnFamily(), columnFamily.getOptions() );

    // the CF def creation uses Asytanax, so manually check the schema agreement
    astyanaxWaitForSchemaAgreement();

    logger.info( "Created column family {}", columnFamily.getColumnFamily().getName() );

}
 

import com.netflix.astyanax.ddl.KeyspaceDefinition; //导入方法依赖的package包/类
private ColumnFamily getLocksColumnFamily() {

        if ( columnFamily == null ) {

            columnFamily = ColumnFamily.newColumnFamily(
                CF_NAME, StringSerializer.get(), StringSerializer.get() );

            if ( logger.isDebugEnabled() ) {

                try {
                    final KeyspaceDefinition kd = keyspace.describeKeyspace();
                    final ColumnFamilyDefinition cfd = kd.getColumnFamily( columnFamily.getName() );
                    Map<String, Object> options = new HashMap<>( 1 );
                    options.put( "gc_grace_seconds", cfd.getGcGraceSeconds() );
                    options.put( "caching", cfd.getCaching() );
                    options.put( "compaction_strategy", cfd.getCompactionStrategy() );
                    options.put( "compaction_strategy_options", cfd.getCompactionStrategyOptions() );
                    logger.debug( "Locks column family {} exists with options: {}", cfd.getName(), options);

                } catch ( ConnectionException ce ) {
                    logger.warn("Error connecting to Cassandra for debug column family info", ce);
                }
            }
        }

        return columnFamily;
    }
 

import com.netflix.astyanax.ddl.KeyspaceDefinition; //导入方法依赖的package包/类
private ColumnFamily createLocksColumnFamily() throws ConnectionException {

        ColumnFamily<String, String> cflocks = ColumnFamily.newColumnFamily(
            CF_NAME, StringSerializer.get(), StringSerializer.get() );

        final KeyspaceDefinition kd = keyspace.describeKeyspace();
        final ColumnFamilyDefinition cfdef = kd.getColumnFamily( cflocks.getName() );

        if ( cfdef == null ) {

            // create only if does not already exist

            MultiTenantColumnFamilyDefinition mtcfd = new MultiTenantColumnFamilyDefinition(
                cflocks,
                BytesType.class.getSimpleName(),
                UTF8Type.class.getSimpleName(),
                BytesType.class.getSimpleName(),
                MultiTenantColumnFamilyDefinition.CacheOption.ALL
            );

            Map<String, Object> cfOptions = mtcfd.getOptions();

            // Additionally set the gc grace low
            cfOptions.put( "gc_grace_seconds", 60 );

            keyspace.createColumnFamily( mtcfd.getColumnFamily(), cfOptions );

            logger.info( "Created column family {}", mtcfd.getOptions() );

            cflocks = mtcfd.getColumnFamily();

        } else {
            return getLocksColumnFamily();
        }

        return cflocks;
    }