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columnfamily.php
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columnfamily.php
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<?php
require_once('connection.php');
require_once('uuid.php');
/**
* @package phpcassa
* @subpackage columnfamily
*/
class CassandraUtil {
/**
* Creates a UUID object from a byte representation.
* @param string $bytes the byte representation of a UUID, which is
* what is returned from functions like uuid1()
* @return a UUID object
*/
static public function import($bytes) {
return UUID::import($bytes);
}
/**
* Generate a v1 UUID (timestamp based)
* @return string a byte[] representation of a UUID
* @param string $node what to use for the MAC portion of the UUID. This will be generated
* randomly if left as NULL
* @param int $time timestamp to use for the UUID. This should be a number of microseconds
* since the UNIX epoch.
*/
static public function uuid1($node=null, $time=null) {
$uuid = UUID::mint(1, $node, null, $time);
return $uuid->bytes;
}
/**
* Generate a v3 UUID
* @return string a byte[] representation of a UUID
*/
static public function uuid3($node=null, $namespace=null) {
$uuid = UUID::mint(3, $node, $namespace);
return $uuid->bytes;
}
/**
* Generate a v4 UUID
* @return string a byte[] representation of a UUID
*/
static public function uuid4() {
$uuid = UUID::mint(4);
return $uuid->bytes;
}
/**
* Generate a v5 UUID
* @return string a byte[] representation of a UUID
*/
static public function uuid5($node, $namespace=null) {
$uuid = UUID::mint(5, $node, $namespace);
return $uuid->bytes;
}
/**
* Get a timestamp with microsecond precision
*/
static public function get_time() {
// By Zach Buller (zachbuller@gmail.com)
$time1 = microtime();
settype($time1, 'string'); //convert to string to keep trailing zeroes
$time2 = explode(" ", $time1);
$sub_secs = preg_replace('/0./', '', $time2[0], 1);
$time3 = ($time2[1].$sub_secs)/100;
return $time3;
}
/**
* Constructs an IndexExpression to be used in an IndexClause, which can
* be used with get_indexed_slices().
* @param mixed $column_name the name of the column this expression will apply to;
* this column may or may not be indexed
* @param mixed $value the value that will be compared to column values using op
* @param classandra_IndexOperator $op the binary operator to apply to column values
* and the 'value' parameter. Defaults to testing for equality.
* @return cassandra_IndexExpression
*/
static public function create_index_expression($column_name, $value,
$op=cassandra_IndexOperator::EQ) {
$ie = new cassandra_IndexExpression();
$ie->column_name = $column_name;
$ie->value = $value;
$ie->op = $op;
return $ie;
}
/**
* Constructs a cassandra_IndexClause for use with get_indexed_slices().
* @param cassandra_IndexExpression[] $expr_list the list of expressions to match; at
* least one of these must be on an indexed column
* @param string $start_key the key to begin searching from
* @param int $count the number of results to return
* @return cassandra_IndexClause
*/
static public function create_index_clause($expr_list, $start_key='',
$count=ColumnFamily::DEFAULT_ROW_COUNT) {
$ic = new cassandra_IndexClause();
$ic->expressions = $expr_list;
$ic->start_key = $start_key;
$ic->count = $count;
return $ic;
}
}
/**
* Representation of a ColumnFamily in Cassandra. This may be used for
* standard column families or super column families. All data insertions,
* deletions, or retrievals will go through a ColumnFamily.
*
* @package phpcassa
* @subpackage columnfamily
*/
class ColumnFamily {
/** The default limit to the number of rows retrieved in queries. */
const DEFAULT_ROW_COUNT = 100; // default max # of rows for get_range()
/** The default limit to the number of columns retrieved in queries. */
const DEFAULT_COLUMN_COUNT = 100; // default max # of columns for get()
/** The maximum number that can be returned by get_count(). */
const MAX_COUNT = 2147483647; # 2^31 - 1
const DEFAULT_BUFFER_SIZE = 1024;
public $client;
private $column_family;
private $is_super;
private $cf_data_type;
private $col_name_type;
private $supercol_name_type;
private $col_type_dict;
public $autopack_names;
public $autopack_values;
public $autopack_keys;
/** @var cassandra_ConsistencyLevel the default read consistency level */
public $read_consistency_level;
/** @var cassandra_ConsistencyLevel the default write consistency level */
public $write_consistency_level;
/** @var bool If true, column values in data fetching operations will be
* replaced by an array of the form array(column_value, column_timestamp). */
public $include_timestamp = false;
/**
* @var int When calling `get_range`, the intermediate results need
* to be buffered if we are fetching many rows, otherwise the Cassandra
* server will overallocate memory and fail. This is the size of
* that buffer in number of rows. The default is 1024.
*/
public $buffer_size = 1024;
/**
* Constructs a ColumnFamily.
*
* @param Connection $connection the connection to use for this ColumnFamily
* @param string $column_family the name of the column family in Cassandra
* @param bool $autopack_names whether or not to automatically convert column names
* to and from their binary representation in Cassandra
* based on their comparator type
* @param bool $autopack_values whether or not to automatically convert column values
* to and from their binary representation in Cassandra
* based on their validator type
* @param cassandra_ConsistencyLevel $read_consistency_level the default consistency
* level for read operations on this column family
* @param cassandra_ConsistencyLevel $write_consistency_level the default consistency
* level for write operations on this column family
* @param int $buffer_size When calling `get_range`, the intermediate results need
* to be buffered if we are fetching many rows, otherwise the Cassandra
* server will overallocate memory and fail. This is the size of
* that buffer in number of rows.
*/
public function __construct($pool,
$column_family,
$autopack_names=true,
$autopack_values=true,
$read_consistency_level=cassandra_ConsistencyLevel::ONE,
$write_consistency_level=cassandra_ConsistencyLevel::ONE,
$buffer_size=self::DEFAULT_BUFFER_SIZE) {
$this->pool = $pool;
$this->column_family = $column_family;
$this->read_consistency_level = $read_consistency_level;
$this->write_consistency_level = $write_consistency_level;
$this->buffer_size = $buffer_size;
$ks = $this->pool->describe_keyspace();
$cf_def = null;
foreach($ks->cf_defs as $cfdef) {
if ($cfdef->name == $this->column_family) {
$cf_def = $cfdef;
break;
}
}
if ($cf_def == null)
throw new cassandra_NotFoundException();
else
$this->cfdef = $cf_def;
$this->cf_data_type = 'BytesType';
$this->col_name_type = 'BytesType';
$this->supercol_name_type = 'BytesType';
$this->key_type = 'BytesType';
$this->col_type_dict = array();
$this->is_super = $this->cfdef->column_type === 'Super';
$this->set_autopack_names($autopack_names);
$this->set_autopack_values($autopack_values);
$this->set_autopack_keys(true);
}
/**
* @param bool $pack_names whether or not column names are automatically packed/unpacked
*/
public function set_autopack_names($pack_names) {
if ($pack_names) {
if ($this->autopack_names)
return;
$this->autopack_names = true;
if (!$this->is_super) {
$this->col_name_type = self::extract_type_name($this->cfdef->comparator_type);
} else {
$this->col_name_type = self::extract_type_name($this->cfdef->subcomparator_type);
$this->supercol_name_type = self::extract_type_name($this->cfdef->comparator_type);
}
} else {
$this->autopack_names = false;
}
}
/**
* @param bool $pack_values whether or not column values are automatically packed/unpacked
*/
public function set_autopack_values($pack_values) {
if ($pack_values) {
$this->autopack_values = true;
$this->cf_data_type = self::extract_type_name($this->cfdef->default_validation_class);
foreach($this->cfdef->column_metadata as $coldef) {
$this->col_type_dict[$coldef->name] =
self::extract_type_name($coldef->validation_class);
}
} else {
$this->autopack_values = false;
}
}
/**
* @param bool $pack_keys whether or not keys are automatically packed/unpacked
*
* Available since Cassandra 0.8.0.
*/
public function set_autopack_keys($pack_keys) {
if ($pack_keys) {
$this->autopack_keys = true;
if (property_exists('cassandra_CfDef', "key_validation_class")) {
$this->key_type = self::extract_type_name($this->cfdef->key_validation_class);
} else {
$this->key_type = 'BytesType';
}
} else {
$this->autopack_keys = false;
}
}
/**
* Fetch a row from this column family.
*
* @param string $key row key to fetch
* @param mixed[] $columns limit the columns or super columns fetched to this list
* @param mixed $column_start only fetch columns with name >= this
* @param mixed $column_finish only fetch columns with name <= this
* @param bool $column_reversed fetch the columns in reverse order
* @param int $column_count limit the number of columns returned to this amount
* @param mixed $super_column return only columns in this super column
* @param cassandra_ConsistencyLevel $read_consistency_level affects the guaranteed
* number of nodes that must respond before the operation returns
*
* @return mixed array(column_name => column_value)
*/
public function get($key,
$columns=null,
$column_start="",
$column_finish="",
$column_reversed=False,
$column_count=self::DEFAULT_COLUMN_COUNT,
$super_column=null,
$read_consistency_level=null) {
$column_parent = $this->create_column_parent($super_column);
$predicate = $this->create_slice_predicate($columns, $column_start, $column_finish,
$column_reversed, $column_count);
$resp = $this->pool->call("get_slice",
$this->pack_key($key),
$column_parent,
$predicate,
$this->rcl($read_consistency_level));
if (count($resp) == 0)
throw new cassandra_NotFoundException();
return $this->supercolumns_or_columns_to_array($resp);
}
/**
* Fetch a set of rows from this column family.
*
* @param string[] $keys row keys to fetch
* @param mixed[] $columns limit the columns or super columns fetched to this list
* @param mixed $column_start only fetch columns with name >= this
* @param mixed $column_finish only fetch columns with name <= this
* @param bool $column_reversed fetch the columns in reverse order
* @param int $column_count limit the number of columns returned to this amount
* @param mixed $super_column return only columns in this super column
* @param cassandra_ConsistencyLevel $read_consistency_level affects the guaranteed
* number of nodes that must respond before the operation returns
* @param int $buffer_size the number of keys to multiget at a single time. If your
* rows are large, having a high buffer size gives poor performance; if your
* rows are small, consider increasing this value.
*
* @return mixed array(key => array(column_name => column_value))
*/
public function multiget($keys,
$columns=null,
$column_start="",
$column_finish="",
$column_reversed=False,
$column_count=self::DEFAULT_COLUMN_COUNT,
$super_column=null,
$read_consistency_level=null,
$buffer_size=16) {
$column_parent = $this->create_column_parent($super_column);
$predicate = $this->create_slice_predicate($columns, $column_start, $column_finish,
$column_reversed, $column_count);
$ret = array();
foreach($keys as $key) {
$ret[$key] = null;
}
$cl = $this->rcl($read_consistency_level);
$resp = array();
if(count($keys) <= $buffer_size) {
$resp = $this->pool->call("multiget_slice",
array_map(array($this, "pack_key"), $keys),
$column_parent,
$predicate,
$cl);
} else {
$subset_keys = array();
$i = 0;
foreach($keys as $key) {
$i += 1;
$subset_keys[] = $key;
if ($i == $buffer_size) {
$sub_resp = $this->pool->call("multiget_slice",
array_map(array($this, "pack_key"), $subset_keys),
$column_parent,
$predicate,
$cl);
$subset_keys = array();
$i = 0;
$resp = $resp + $sub_resp;
}
}
if (count($subset_keys) != 0) {
$sub_resp = $this->pool->call("multiget_slice",
array_map(array($this, "pack_key"), $subset_keys),
$column_parent,
$predicate,
$cl);
$resp = $resp + $sub_resp;
}
}
$non_empty_keys = array();
foreach($resp as $key => $val) {
if (count($val) > 0) {
$unpacked_key = $this->unpack_key($key);
$non_empty_keys[$unpacked_key] = 1;
$ret[$unpacked_key] = $this->supercolumns_or_columns_to_array($val);
}
}
foreach($keys as $key) {
if (!isset($non_empty_keys[$key]))
unset($ret[$key]);
}
return $ret;
}
/**
* Count the number of columns in a row.
*
* @param string $key row to be counted
* @param mixed[] $columns limit the possible columns or super columns counted to this list
* @param mixed $column_start only count columns with name >= this
* @param mixed $column_finish only count columns with name <= this
* @param mixed $super_column count only columns in this super column
* @param cassandra_ConsistencyLevel $read_consistency_level affects the guaranteed
* number of nodes that must respond before the operation returns
*
* @return int
*/
public function get_count($key,
$columns=null,
$column_start='',
$column_finish='',
$super_column=null,
$read_consistency_level=null) {
$column_parent = $this->create_column_parent($super_column);
$predicate = $this->create_slice_predicate($columns, $column_start, $column_finish,
false, self::MAX_COUNT);
$packed_key = $this->pack_key($key);
return $this->pool->call("get_count", $packed_key, $column_parent, $predicate,
$this->rcl($read_consistency_level));
}
/**
* Count the number of columns in a set of rows.
*
* @param string[] $keys rows to be counted
* @param mixed[] $columns limit the possible columns or super columns counted to this list
* @param mixed $column_start only count columns with name >= this
* @param mixed $column_finish only count columns with name <= this
* @param mixed $super_column count only columns in this super column
* @param cassandra_ConsistencyLevel $read_consistency_level affects the guaranteed
* number of nodes that must respond before the operation returns
*
* @return mixed array(row_key => row_count)
*/
public function multiget_count($keys,
$columns=null,
$column_start='',
$column_finish='',
$super_column=null,
$read_consistency_level=null) {
$column_parent = $this->create_column_parent($super_column);
$predicate = $this->create_slice_predicate($columns, $column_start, $column_finish,
false, self::MAX_COUNT);
$packed_keys = array_map(array($this, "pack_key"), $keys);
$results = $this->pool->call("multiget_count", $packed_keys, $column_parent, $predicate,
$this->rcl($read_consistency_level));
$ret = array();
foreach ($results as $key => $count) {
$unpacked_key = $this->unpack_key($key);
$ret[$key] = $count;
}
return $ret;
}
/**
* Get an iterator over a range of rows.
*
* @param string $key_start fetch rows with a key >= this
* @param string $key_finish fetch rows with a key <= this
* @param int $row_count limit the number of rows returned to this amount
* @param mixed[] $columns limit the columns or super columns fetched to this list
* @param mixed $column_start only fetch columns with name >= this
* @param mixed $column_finish only fetch columns with name <= this
* @param bool $column_reversed fetch the columns in reverse order
* @param int $column_count limit the number of columns returned to this amount
* @param mixed $super_column return only columns in this super column
* @param cassandra_ConsistencyLevel $read_consistency_level affects the guaranteed
* number of nodes that must respond before the operation returns
* @param int $buffer_size When calling `get_range`, the intermediate results need
* to be buffered if we are fetching many rows, otherwise the Cassandra
* server will overallocate memory and fail. This is the size of
* that buffer in number of rows.
*
* @return RangeColumnFamilyIterator
*/
public function get_range($key_start="",
$key_finish="",
$row_count=self::DEFAULT_ROW_COUNT,
$columns=null,
$column_start="",
$column_finish="",
$column_reversed=false,
$column_count=self::DEFAULT_COLUMN_COUNT,
$super_column=null,
$read_consistency_level=null,
$buffer_size=null) {
if ($buffer_size == null)
$buffer_size = $this->buffer_size;
if ($buffer_size < 2) {
$ire = new cassandra_InvalidRequestException();
$ire->message = 'buffer_size cannot be less than 2';
throw $ire;
}
$column_parent = $this->create_column_parent($super_column);
$predicate = $this->create_slice_predicate($columns, $column_start,
$column_finish, $column_reversed,
$column_count);
$packed_key_start = $this->pack_key($key_start);
$packed_key_finish = $this->pack_key($key_finish);
return new RangeColumnFamilyIterator($this, $buffer_size,
$packed_key_start, $packed_key_finish,
$row_count, $column_parent, $predicate,
$this->rcl($read_consistency_level));
}
/**
* Fetch a set of rows from this column family based on an index clause.
*
* @param cassandra_IndexClause $index_clause limits the keys that are returned based
* on expressions that compare the value of a column to a given value. At least
* one of the expressions in the IndexClause must be on an indexed column. You
* can use the CassandraUtil::create_index_expression() and
* CassandraUtil::create_index_clause() methods to help build this.
* @param mixed[] $columns limit the columns or super columns fetched to this list
* @param mixed $column_start only fetch columns with name >= this
* @param mixed $column_finish only fetch columns with name <= this
* @param bool $column_reversed fetch the columns in reverse order
* @param int $column_count limit the number of columns returned to this amount
* @param mixed $super_column return only columns in this super column
* @param cassandra_ConsistencyLevel $read_consistency_level affects the guaranteed
* number of nodes that must respond before the operation returns
*
* @return mixed array(row_key => array(column_name => column_value))
*/
public function get_indexed_slices($index_clause,
$columns=null,
$column_start='',
$column_finish='',
$column_reversed=false,
$column_count=self::DEFAULT_COLUMN_COUNT,
$super_column=null,
$read_consistency_level=null,
$buffer_size=null) {
if ($buffer_size == null)
$buffer_size = $this->buffer_size;
if ($buffer_size < 2) {
$ire = new cassandra_InvalidRequestException();
$ire->message = 'buffer_size cannot be less than 2';
throw $ire;
}
$new_clause = new cassandra_IndexClause();
foreach($index_clause->expressions as $expr) {
$new_expr = new cassandra_IndexExpression();
$new_expr->value = $this->pack_value($expr->value, $expr->column_name);
$new_expr->column_name = $this->pack_name($expr->column_name);
$new_expr->op = $expr->op;
$new_clause->expressions[] = $new_expr;
}
$new_clause->start_key = $this->pack_key($index_clause->start_key);
$new_clause->count = $index_clause->count;
$column_parent = $this->create_column_parent($super_column);
$predicate = $this->create_slice_predicate($columns, $column_start,
$column_finish, $column_reversed,
$column_count);
return new IndexedColumnFamilyIterator($this, $new_clause, $buffer_size,
$column_parent, $predicate,
$this->rcl($read_consistency_level));
}
/**
* Insert or update columns in a row.
*
* @param string $key the row to insert or update the columns in
* @param mixed $columns array(column_name => column_value) the columns to insert or update
* @param int $timestamp the timestamp to use for this insertion. Leaving this as null will
* result in a timestamp being generated for you
* @param int $ttl time to live for the columns; after ttl seconds they will be deleted
* @param cassandra_ConsistencyLevel $write_consistency_level affects the guaranteed
* number of nodes that must respond before the operation returns
*
* @return int the timestamp for the operation
*/
public function insert($key,
$columns,
$timestamp=null,
$ttl=null,
$write_consistency_level=null) {
if ($timestamp == null)
$timestamp = CassandraUtil::get_time();
$cfmap = array();
$packed_key = $this->pack_key($key);
$cfmap[$packed_key][$this->column_family] = $this->array_to_mutation($columns, $timestamp, $ttl);
return $this->pool->call("batch_mutate", $cfmap, $this->wcl($write_consistency_level));
}
/**
* Increment or decrement a counter.
*
* `value` should be an integer, either positive or negative, to be added
* to a counter column. By default, `value` is 1.
*
* This method is not idempotent. Retrying a failed add may result
* in a double count. You should consider using a separate
* ConnectionPool with retries disabled for column families
* with counters.
*
* Only available in Cassandra 0.8.0 and later.
*
* @param string $key the row to insert or update the columns in
* @param mixed $column the column name of the counter
* @param int $value the amount to adjust the counter by
* @param mixed $super_column the super column to use if this is a
* super column family
* @param cassandra_ConsistencyLevel $write_consistency_level affects the guaranteed
* number of nodes that must respond before the operation returns
*/
public function add($key, $column, $value=1, $super_column=null,
$write_consistency_level=null) {
$cp = $this->create_column_parent($super_column);
$packed_key = $this->pack_key($key);
$counter = new cassandra_CounterColumn();
$counter->name = $this->pack_name($column);
$counter->value = $value;
$this->pool->call("add", $packed_key, $cp, $counter, $this->wcl($write_consistency_level));
}
/**
* Insert or update columns in multiple rows. Note that this operation is only atomic
* per row.
*
* @param array $rows an array of keys, each of which maps to an array of columns. This
* looks like array(key => array(column_name => column_value))
* @param int $timestamp the timestamp to use for these insertions. Leaving this as null will
* result in a timestamp being generated for you
* @param int $ttl time to live for the columns; after ttl seconds they will be deleted
* @param cassandra_ConsistencyLevel $write_consistency_level affects the guaranteed
* number of nodes that must respond before the operation returns
*
* @return int the timestamp for the operation
*/
public function batch_insert($rows, $timestamp=null, $ttl=null, $write_consistency_level=null) {
if ($timestamp == null)
$timestamp = CassandraUtil::get_time();
$cfmap = array();
foreach($rows as $key => $columns) {
$packed_key = $this->pack_key($key);
$cfmap[$packed_key][$this->column_family] = $this->array_to_mutation($columns, $timestamp, $ttl);
}
return $this->pool->call("batch_mutate", $cfmap, $this->wcl($write_consistency_level));
}
/**
* Remove columns from a row.
*
* @param string $key the row to remove columns from
* @param mixed[] $columns the columns to remove. If null, the entire row will be removed.
* @param mixed $super_column only remove this super column
* @param cassandra_ConsistencyLevel $write_consistency_level affects the guaranteed
* number of nodes that must respond before the operation returns
*
* @return int the timestamp for the operation
*/
public function remove($key, $columns=null, $super_column=null, $write_consistency_level=null) {
$timestamp = CassandraUtil::get_time();
$packed_key = $this->pack_key($key);
if ($columns == null || count($columns) == 1)
{
$cp = new cassandra_ColumnPath();
$cp->column_family = $this->column_family;
$cp->super_column = $this->pack_name($super_column, true);
if ($columns != null) {
if ($this->is_super && $super_column == null)
$cp->super_column = $this->pack_name($columns[0], true);
else
$cp->column = $this->pack_name($columns[0], false);
}
return $this->pool->call("remove", $packed_key, $cp, $timestamp,
$this->wcl($write_consistency_level));
}
$deletion = new cassandra_Deletion();
$deletion->timestamp = $timestamp;
$deletion->super_column = $this->pack_name($super_column, true);
if ($columns != null) {
$predicate = $this->create_slice_predicate($columns, '', '', false,
self::DEFAULT_COLUMN_COUNT);
$deletion->predicate = $predicate;
}
$mutation = new cassandra_Mutation();
$mutation->deletion = $deletion;
$mut_map = array($packed_key => array($this->column_family => array($mutation)));
return $this->pool->call("batch_mutate", $mut_map, $this->wcl($write_consistency_level));
}
/**
* Remove a counter at the specified location.
*
* Note that counters have limited support for deletes: if you remove a
* counter, you must wait to issue any following update until the delete
* has reached all the nodes and all of them have been fully compacted.
*
* Available in Cassandra 0.8.0 and later.
*
* @param string $key the row to insert or update the columns in
* @param mixed $column the column name of the counter
* @param mixed $super_column the super column to use if this is a
* super column family
* @param cassandra_ConsistencyLevel $write_consistency_level affects the guaranteed
* number of nodes that must respond before the operation returns
*/
public function remove_counter($key, $column, $super_column=null,
$write_consistency_level=null) {
$cp = new cassandra_ColumnPath();
$packed_key = $this->pack_key($key);
$cp->column_family = $this->column_family;
$cp->super_column = $this->pack_name($super_column, true);
$cp->column = $this->pack_name($column);
$this->pool->call("remove_counter", $packed_key, $cp, $this->wcl($write_consistency_level));
}
/**
* Mark the entire column family as deleted.
*
* From the user's perspective a successful call to truncate will result
* complete data deletion from cfname. Internally, however, disk space
* will not be immediatily released, as with all deletes in cassandra,
* this one only marks the data as deleted.
*
* The operation succeeds only if all hosts in the cluster at available
* and will throw an UnavailableException if some hosts are down.
*/
public function truncate() {
return $this->pool->call("truncate", $this->column_family);
}
/********************* Helper functions *************************/
private static $TYPES = array('BytesType' => 1, 'LongType' => 1, 'IntegerType' => 1,
'UTF8Type' => 1, 'AsciiType' => 1, 'LexicalUUIDType' => 1,
'TimeUUIDType' => 1);
private static function extract_type_name($type_string) {
if ($type_string == null or $type_string == '')
return 'BytesType';
$index = strrpos($type_string, '.');
if ($index == false)
return 'BytesType';
$type = substr($type_string, $index + 1);
if (!isset(self::$TYPES[$type]))
return 'BytesType';
return $type;
}
private function rcl($read_consistency_level) {
if ($read_consistency_level == null)
return $this->read_consistency_level;
else
return $read_consistency_level;
}
private function wcl($write_consistency_level) {
if ($write_consistency_level == null)
return $this->write_consistency_level;
else
return $write_consistency_level;
}
private function create_slice_predicate($columns, $column_start, $column_finish,
$column_reversed, $column_count) {
$predicate = new cassandra_SlicePredicate();
if ($columns !== null) {
$packed_cols = array();
foreach($columns as $col)
$packed_cols[] = $this->pack_name($col, $this->is_super);
$predicate->column_names = $packed_cols;
} else {
if ($column_start != null and $column_start != '')
$column_start = $this->pack_name($column_start,
$this->is_super,
self::SLICE_START);
if ($column_finish != null and $column_finish != '')
$column_finish = $this->pack_name($column_finish,
$this->is_super,
self::SLICE_FINISH);
$slice_range = new cassandra_SliceRange();
$slice_range->count = $column_count;
$slice_range->reversed = $column_reversed;
$slice_range->start = $column_start;
$slice_range->finish = $column_finish;
$predicate->slice_range = $slice_range;
}
return $predicate;
}
private function create_column_parent($super_column=null) {
$column_parent = new cassandra_ColumnParent();
$column_parent->column_family = $this->column_family;
$column_parent->super_column = $this->pack_name($super_column, true);
return $column_parent;
}
const NON_SLICE = 0;
const SLICE_START = 1;
const SLICE_FINISH = 2;
private function pack_name($value, $is_supercol_name=false, $slice_end=self::NON_SLICE) {
if (!$this->autopack_names)
return $value;
if ($value == null)
return;
if ($is_supercol_name)
$d_type = $this->supercol_name_type;
else
$d_type = $this->col_name_type;
return $this->pack($value, $d_type);
}
private function unpack_name($b, $is_supercol_name=false) {
if (!$this->autopack_names)
return $b;
if ($b == null)
return;
if ($is_supercol_name)
$d_type = $this->supercol_name_type;
else
$d_type = $this->col_name_type;
return $this->unpack($b, $d_type);
}
public function pack_key($key) {
if (!$this->autopack_keys)
return $key;
return $this->pack($key, $this->key_type);
}
public function unpack_key($b) {
if (!$this->autopack_keys)
return $b;
return $this->unpack($b, $this->key_type);
}
private function get_data_type_for_col($col_name) {
if (isset($this->col_type_dict[$col_name]))
return $this->col_type_dict[$col_name];
else
return $this->cf_data_type;
}
private function pack_value($value, $col_name) {
if (!$this->autopack_values)
return $value;
return $this->pack($value, $this->get_data_type_for_col($col_name));
}
private function unpack_value($value, $col_name) {
if (!$this->autopack_values)
return $value;
return $this->unpack($value, $this->get_data_type_for_col($col_name));
}
private static function unpack_str($str, $len) {
$tmp_arr = unpack("c".$len."chars", $str);
$out_str = "";
foreach($tmp_arr as $v)
if($v > 0) { $out_str .= chr($v); }
return $out_str;
}
private static function pack_str($str, $len) {
$out_str = "";
for($i=0; $i<$len; $i++)
$out_str .= pack("c", ord(substr($str, $i, 1)));
return $out_str;
}
private static function pack_long($value) {
// If we are on a 32bit architecture we have to explicitly deal with
// 64-bit twos-complement arithmetic since PHP wants to treat all ints
// as signed and any int over 2^31 - 1 as a float
if (PHP_INT_SIZE == 4) {
$neg = $value < 0;
if ($neg) {
$value *= -1;
}
$hi = (int)($value / 4294967296);
$lo = (int)$value;
if ($neg) {
$hi = ~$hi;
$lo = ~$lo;
if (($lo & (int)0xffffffff) == (int)0xffffffff) {
$lo = 0;
$hi++;
} else {
$lo++;
}
}
$data = pack('N2', $hi, $lo);
} else {
$hi = $value >> 32;
$lo = $value & 0xFFFFFFFF;
$data = pack('N2', $hi, $lo);
}
return $data;
}
private static function unpack_long($data) {
$arr = unpack('N2', $data);
// If we are on a 32bit architecture we have to explicitly deal with
// 64-bit twos-complement arithmetic since PHP wants to treat all ints
// as signed and any int over 2^31 - 1 as a float
if (PHP_INT_SIZE == 4) {
$hi = $arr[1];
$lo = $arr[2];
$isNeg = $hi < 0;
// Check for a negative
if ($isNeg) {
$hi = ~$hi & (int)0xffffffff;
$lo = ~$lo & (int)0xffffffff;
if ($lo == (int)0xffffffff) {
$hi++;
$lo = 0;
} else {
$lo++;
}
}
// Force 32bit words in excess of 2G to pe positive - we deal wigh sign
// explicitly below
if ($hi & (int)0x80000000) {
$hi &= (int)0x7fffffff;
$hi += 0x80000000;
}
if ($lo & (int)0x80000000) {
$lo &= (int)0x7fffffff;
$lo += 0x80000000;
}
$value = $hi * 4294967296 + $lo;
if ($isNeg)
$value = 0 - $value;
} else {
// Upcast negatives in LSB bit
if ($arr[2] & 0x80000000)
$arr[2] = $arr[2] & 0xffffffff;
// Check for a negative
if ($arr[1] & 0x80000000) {
$arr[1] = $arr[1] & 0xffffffff;
$arr[1] = $arr[1] ^ 0xffffffff;
$arr[2] = $arr[2] ^ 0xffffffff;
$value = 0 - $arr[1]*4294967296 - $arr[2] - 1;
} else {
$value = $arr[1]*4294967296 + $arr[2];
}
}
return $value;
}
private function pack($value, $data_type) {
if ($data_type == 'LongType')