Package com.aerospike.client

Class Key

java.lang.Object

com.aerospike.client.Key

public final class Key
extends Object

Unique record identifier. Records can be identified using a specified namespace, an optional set name, and a user defined key which must be unique within a set. Records can also be identified by namespace/digest which is the combination used on the server.

Field Summary

Fields

Modifier and Type	Field	Description
final byte[]	digest	Unique server hash value generated from set name and user key.
final String	namespace	Namespace.
final String	setName	Optional set name.
final Value	userKey	Original user key.

Constructor Summary

Constructors

Constructor	Description
Key(String namespace, byte[] digest, String setName, Value userKey)	Initialize key from namespace, digest, optional set name and optional userKey.
Key(String namespace, String setName, byte[] key)	Initialize key from namespace, optional set name and user key.
Key(String namespace, String setName, byte[] key, int offset, int length)	Initialize key from namespace, optional set name and user key.
Key(String namespace, String setName, int key)	Initialize key from namespace, optional set name and user key.
Key(String namespace, String setName, long key)	Initialize key from namespace, optional set name and user key.
Key(String namespace, String setName, Value key)	Initialize key from namespace, optional set name and user key.
Key(String namespace, String setName, String key)	Initialize key from namespace, optional set name and user key.

Method Summary

Modifier and Type	Method	Description
static byte[]	computeDigest(String setName, Value key)	Generate unique server hash value from set name, key type and user defined key.
boolean	equals(Object obj)	Equality uses namespace and digest.
int	hashCode()	Hash lookup uses namespace and digest.
String	toString()

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Field Details

namespace

public final String namespace

Namespace. Equivalent to database name.

setName

public final String setName

Optional set name. Equivalent to database table.

digest

public final byte[] digest

Unique server hash value generated from set name and user key.

userKey

public final Value userKey

Original user key. This key is immediately converted to a hash digest. This key is not used or returned by the server by default. If the user key needs to persist on the server, use one of the following methods:

• Set "WritePolicy.sendKey" to true. In this case, the key will be sent to the server for storage on writes and retrieved on multi-record scans and queries.
• Explicitly store and retrieve the key in a bin.

Constructor Details

Key

public Key(String namespace,
 String setName,
 String key)
    throws AerospikeException

Initialize key from namespace, optional set name and user key. The set name and user defined key are converted to a digest before sending to the server. The user key is not used or returned by the server by default. If the user key needs to persist on the server, use one of the following methods:

• Set "WritePolicy.sendKey" to true. In this case, the key will be sent to the server for storage on writes and retrieved on multi-record scans and queries.
• Explicitly store and retrieve the key in a bin.

The key is converted to bytes to compute the digest. The key's byte size is limited to the current thread's buffer size (min 8KB). To store keys > 8KB, do one of the following:

• Set once:

  ThreadLocalData.DefaultBufferSize = maxKeySize + maxSetNameSize + 1;

• Or for every key:

   int len = key.length() + setName.length() + 1;
   if (len > ThreadLocalData.getBuffer().length))
       ThreadLocalData.resizeBuffer(len);
   

Parameters:

namespace - namespace

setName - optional set name, enter null when set does not exist

key - user defined unique identifier within set.

Throws:

AerospikeException - if digest computation fails

Key

public Key(String namespace,
 String setName,
 byte[] key)
    throws AerospikeException

Initialize key from namespace, optional set name and user key. The set name and user defined key are converted to a digest before sending to the server. The user key is not used or returned by the server by default. If the user key needs to persist on the server, use one of the following methods:

• Set "WritePolicy.sendKey" to true. In this case, the key will be sent to the server for storage on writes and retrieved on multi-record scans and queries.
• Explicitly store and retrieve the key in a bin.

The key's byte size is limited to the current thread's buffer size (min 8KB). To store keys > 8KB, do one of the following:

• Set once:

  ThreadLocalData.DefaultBufferSize = maxKeySize + maxSetNameSize + 1;

• Or for every key:

   int len = key.length + setName.length() + 1;
   if (len > ThreadLocalData.getBuffer().length))
       ThreadLocalData.resizeBuffer(len);
   

Parameters:

namespace - namespace

setName - optional set name, enter null when set does not exist

key - user defined unique identifier within set.

Throws:

AerospikeException - if digest computation fails

Key

public Key(String namespace,
 String setName,
 byte[] key,
 int offset,
 int length)
    throws AerospikeException

Initialize key from namespace, optional set name and user key. The set name and user defined key are converted to a digest before sending to the server. The user key is not used or returned by the server by default. If the user key needs to persist on the server, use one of the following methods:

• Set "WritePolicy.sendKey" to true. In this case, the key will be sent to the server for storage on writes and retrieved on multi-record scans and queries.
• Explicitly store and retrieve the key in a bin.

The key's byte size is limited to the current thread's buffer size (min 8KB). To store keys > 8KB, do one of the following:

• Set once:

  ThreadLocalData.DefaultBufferSize = maxKeySize + maxSetNameSize + 1;

• Or for every key:

   int len = length + setName.length() + 1;
   if (len > ThreadLocalData.getBuffer().length))
       ThreadLocalData.resizeBuffer(len);
   

Parameters:

namespace - namespace

setName - optional set name, enter null when set does not exist

key - user defined unique identifier within set.

offset - byte array segment offset

length - byte array segment length

Throws:

AerospikeException - if digest computation fails

Key

public Key(String namespace,
 String setName,
 int key)
    throws AerospikeException

Initialize key from namespace, optional set name and user key. The set name and user defined key are converted to a digest before sending to the server. The user key is not used or returned by the server by default. If the user key needs to persist on the server, use one of the following methods:

• Set "WritePolicy.sendKey" to true. In this case, the key will be sent to the server for storage on writes and retrieved on multi-record scans and queries.
• Explicitly store and retrieve the key in a bin.

Parameters:

namespace - namespace

setName - optional set name, enter null when set does not exist

key - user defined unique identifier within set.

Throws:

AerospikeException - if digest computation fails

Key

public Key(String namespace,
 String setName,
 long key)
    throws AerospikeException

Initialize key from namespace, optional set name and user key. The set name and user defined key are converted to a digest before sending to the server. The user key is not used or returned by the server by default. If the user key needs to persist on the server, use one of the following methods:

• Set "WritePolicy.sendKey" to true. In this case, the key will be sent to the server for storage on writes and retrieved on multi-record scans and queries.
• Explicitly store and retrieve the key in a bin.

Parameters:

namespace - namespace

setName - optional set name, enter null when set does not exist

key - user defined unique identifier within set.

Throws:

AerospikeException - if digest computation fails

Key

public Key(String namespace,
 String setName,
 Value key)
    throws AerospikeException

Initialize key from namespace, optional set name and user key. The set name and user defined key are converted to a digest before sending to the server. The user key is not used or returned by the server by default. If the user key needs to persist on the server, use one of the following methods:

• Set "WritePolicy.sendKey" to true. In this case, the key will be sent to the server for storage on writes and retrieved on multi-record scans and queries.
• Explicitly store and retrieve the key in a bin.

Parameters:

namespace - namespace

setName - optional set name, enter null when set does not exist

key - user defined unique identifier within set.

Throws:

AerospikeException - if digest computation fails

Key

public Key(String namespace,
 byte[] digest,
 String setName,
 Value userKey)

Initialize key from namespace, digest, optional set name and optional userKey.

Parameters:

namespace - namespace

digest - unique server hash value

setName - optional set name, enter null when set does not exist

userKey - optional original user key (not hash digest).

Method Details

hashCode

public int hashCode()

Hash lookup uses namespace and digest.

Overrides:

hashCode in class Object

equals

public boolean equals(Object obj)

Equality uses namespace and digest.

Overrides:

equals in class Object

computeDigest

public static byte[] computeDigest(String setName,
 Value key)
                            throws AerospikeException

Generate unique server hash value from set name, key type and user defined key. The hash function is RIPEMD-160 (a 160 bit hash).

Parameters:

setName - optional set name, enter null when set does not exist

key - record identifier, unique within set

Returns:

unique server hash value

Throws:

AerospikeException - if digest computation fails

toString

public String toString()

Overrides:

toString in class Object