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The Zookeeper class

(PECL zookeeper >= 0.1.0)

はじめに

Represents ZooKeeper session.

クラス概要

class Zookeeper {
/* メソッド */
public __construct(string $host = '', callable $watcher_cb = null, int $recv_timeout = 10000)
public addAuth(string $scheme, string $cert, callable $completion_cb = null): bool
public close(): void
public connect(string $host, callable $watcher_cb = null, int $recv_timeout = 10000): void
public create(
    string $path,
    string $value,
    array $acls,
    int $flags = null
): string
public delete(string $path, int $version = -1): bool
public exists(string $path, callable $watcher_cb = null): array
public get(
    string $path,
    callable $watcher_cb = null,
    array &$stat = null,
    int $max_size = 0
): string
public getAcl(string $path): array
public getChildren(string $path, callable $watcher_cb = null): array
public getClientId(): int
public getRecvTimeout(): int
public getState(): int
public isRecoverable(): bool
public set(
    string $path,
    string $value,
    int $version = -1,
    array &$stat = null
): bool
public setAcl(string $path, int $version, array $acl): bool
public static setDebugLevel(int $logLevel): bool
public static setDeterministicConnOrder(bool $yesOrNo): bool
public setLogStream(resource $stream): bool
public setWatcher(callable $watcher_cb): bool
/* 定数 */
const int PERM_READ = 1;
const int PERM_WRITE = 2;
const int PERM_CREATE = 4;
const int PERM_DELETE = 8;
const int PERM_ADMIN = 16;
const int PERM_ALL = 31;
const int EPHEMERAL = 1;
const int SEQUENCE = 2;
const int LOG_LEVEL_ERROR = 1;
const int LOG_LEVEL_WARN = 2;
const int LOG_LEVEL_INFO = 3;
const int LOG_LEVEL_DEBUG = 4;
const int EXPIRED_SESSION_STATE = -112;
const int AUTH_FAILED_STATE = -113;
const int CONNECTING_STATE = 1;
const int ASSOCIATING_STATE = 2;
const int CONNECTED_STATE = 3;
const int READONLY_STATE = 5;
const int NOTCONNECTED_STATE = 999;
const int CREATED_EVENT = 1;
const int DELETED_EVENT = 2;
const int CHANGED_EVENT = 3;
const int CHILD_EVENT = 4;
const int SESSION_EVENT = -1;
const int NOTWATCHING_EVENT = -2;
const int SYSTEMERROR = -1;
const int RUNTIMEINCONSISTENCY = -2;
const int DATAINCONSISTENCY = -3;
const int CONNECTIONLOSS = -4;
const int MARSHALLINGERROR = -5;
const int UNIMPLEMENTED = -6;
const int OPERATIONTIMEOUT = -7;
const int BADARGUMENTS = -8;
const int INVALIDSTATE = -9;
const int NEWCONFIGNOQUORUM = -13;
const int RECONFIGINPROGRESS = -14;
const int OK = 0;
const int APIERROR = -100;
const int NONODE = -101;
const int NOAUTH = -102;
const int BADVERSION = -103;
const int NOCHILDRENFOREPHEMERALS = -108;
const int NODEEXISTS = -110;
const int NOTEMPTY = -111;
const int SESSIONEXPIRED = -112;
const int INVALIDCALLBACK = -113;
const int INVALIDACL = -114;
const int AUTHFAILED = -115;
const int CLOSING = -116;
const int NOTHING = -117;
const int SESSIONMOVED = -118;
const int NOTREADONLY = -119;
const int EPHEMERALONLOCALSESSION = -120;
const int NOWATCHER = -121;
const int RECONFIGDISABLED = -122;
}

定義済み定数

ZooKeeper Permissions

Zookeeper::PERM_READ

Can read nodes value and list its children

Zookeeper::PERM_WRITE

Can set the nodes value

Zookeeper::PERM_CREATE

Can create children

Zookeeper::PERM_DELETE

Can delete children

Zookeeper::PERM_ADMIN

Can execute set_acl()

Zookeeper::PERM_ALL

All of the above flags ORd together

ZooKeeper Create Flags

Zookeeper::EPHEMERAL

If Zookeeper::EPHEMERAL flag is set, the node will automatically get removed if the client session goes away.

Zookeeper::SEQUENCE

If the Zookeeper::SEQUENCE flag is set, a unique monotonically increasing sequence number is appended to the path name. The sequence number is always fixed length of 10 digits, 0 padded.

ZooKeeper Log Levels

Zookeeper::LOG_LEVEL_ERROR

Outputs only error mesages

Zookeeper::LOG_LEVEL_WARN

Outputs errors/warnings

Zookeeper::LOG_LEVEL_INFO

Outputs big action messages besides errors/warnings

Zookeeper::LOG_LEVEL_DEBUG

Outputs all

ZooKeeper States

Zookeeper::EXPIRED_SESSION_STATE

Connected but session expired

Zookeeper::AUTH_FAILED_STATE

Connected but auth failed

Zookeeper::CONNECTING_STATE

Connecting

Zookeeper::ASSOCIATING_STATE

Associating

Zookeeper::CONNECTED_STATE

Connected

Zookeeper::READONLY_STATE

TODO: help us improve this extension.

Zookeeper::NOTCONNECTED_STATE

Connection failed

ZooKeeper Watch Types

Zookeeper::CREATED_EVENT

A node has been created

This is only generated by watches on non-existent nodes. These watches are set using Zookeeper::exists.

Zookeeper::DELETED_EVENT

A node has been deleted

This is only generated by watches on nodes. These watches are set using Zookeeper::exists and Zookeeper::get.

Zookeeper::CHANGED_EVENT

A node has changed

This is only generated by watches on nodes. These watches are set using Zookeeper::exists and Zookeeper::get.

Zookeeper::CHILD_EVENT

A change as occurred in the list of children

This is only generated by watches on the child list of a node. These watches are set using Zookeeper::getChildren.

Zookeeper::SESSION_EVENT

A session has been lost

This is generated when a client loses contact or reconnects with a server.

Zookeeper::NOTWATCHING_EVENT

A watch has been removed

This is generated when the server for some reason, probably a resource constraint, will no longer watch a node for a client.

ZooKeeper System and Server-side Errors

Zookeeper::SYSTEMERROR

This is never thrown by the server, it shouldn't be used other than to indicate a range. Specifically error codes greater than this value, but lesser than Zookeeper::APIERROR, are system errors.

Zookeeper::RUNTIMEINCONSISTENCY

A runtime inconsistency was found.

Zookeeper::DATAINCONSISTENCY

A data inconsistency was found.

Zookeeper::CONNECTIONLOSS

Connection to the server has been lost.

Zookeeper::MARSHALLINGERROR

Error while marshalling or unmarshalling data.

Zookeeper::UNIMPLEMENTED

Operation is unimplemented.

Zookeeper::OPERATIONTIMEOUT

Operation timeout.

Zookeeper::BADARGUMENTS

Invalid arguments.

Zookeeper::INVALIDSTATE

Invliad zhandle state.

Zookeeper::NEWCONFIGNOQUORUM

No quorum of new config is connected and up-to-date with the leader of last committed config - try invoking reconfiguration after new servers are connected and synced.

Available as of ZooKeeper 3.5.0

Zookeeper::RECONFIGINPROGRESS

Reconfiguration requested while another reconfiguration is currently in progress. This is currently not supported. Please retry.

Available as of ZooKeeper 3.5.0

ZooKeeper API Errors

Zookeeper::OK

Everything is OK.

Zookeeper::APIERROR

This is never thrown by the server, it shouldn't be used other than to indicate a range. Specifically error codes greater than this value are API errors (while values less than this indicate a Zookeeper::SYSTEMERROR).

Zookeeper::NONODE

Node does not exist.

Zookeeper::NOAUTH

Not authenticated.

Zookeeper::BADVERSION

Version conflict.

Zookeeper::NOCHILDRENFOREPHEMERALS

Ephemeral nodes may not have children.

Zookeeper::NODEEXISTS

The node already exists.

Zookeeper::NOTEMPTY

The node has children.

Zookeeper::SESSIONEXPIRED

The session has been expired by the server.

Zookeeper::INVALIDCALLBACK

Invalid callback specified.

Zookeeper::INVALIDACL

Invalid ACL specified.

Zookeeper::AUTHFAILED

Client authentication failed.

Zookeeper::CLOSING

ZooKeeper is closing.

Zookeeper::NOTHING

(not error) No server responses to process.

Zookeeper::SESSIONMOVED

Session moved to another server, so operation is ignored.

Zookeeper::NOTREADONLY

State-changing request is passed to read-only server.

Zookeeper::EPHEMERALONLOCALSESSION

Attempt to create ephemeral node on a local session.

Zookeeper::NOWATCHER

The watcher couldn't be found.

Zookeeper::RECONFIGDISABLED

Attempts to perform a reconfiguration operation when reconfiguration feature is disabled.

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