com.netflix.astyanax.recipes.uniqueness

Class ColumnPrefixUniquenessConstraint<K>

java.lang.Object

com.netflix.astyanax.recipes.uniqueness.ColumnPrefixUniquenessConstraint<K>

Type Parameters:

K -

All Implemented Interfaces:

UniquenessConstraint

public class ColumnPrefixUniquenessConstraint<K>
extends java.lang.Object
implements UniquenessConstraint

Perform a uniqueness constraint using the locking recipe. The usage here is to take the lock and then re-write the column without a TTL to 'persist' it in cassandra.

Constructor Summary

Constructors

Constructor and Description
ColumnPrefixUniquenessConstraint(com.netflix.astyanax.Keyspace keyspace, com.netflix.astyanax.model.ColumnFamily<K,java.lang.String> columnFamily, K key)

Method Summary

Methods

Modifier and Type	Method and Description
void	acquire() Acquire the row(s) for uniqueness.
void	acquireAndApplyMutation(com.google.common.base.Function<com.netflix.astyanax.MutationBatch,java.lang.Boolean> callback) Acquire the uniqueness constraint and call the mutate callback to fill a mutation.
void	acquireAndMutate(com.netflix.astyanax.MutationBatch m) Deprecated. Use acquireAndExecuteMutation instead to avoid timestamp issues
java.lang.String	readUniqueColumn()
void	release() Release the uniqueness lock for this row.
ColumnPrefixUniquenessConstraint<K>	withConsistencyLevel(com.netflix.astyanax.model.ConsistencyLevel consistencyLevel)
ColumnPrefixUniquenessConstraint<K>	withPrefix(java.lang.String prefix)
ColumnPrefixUniquenessConstraint<K>	withTtl(java.lang.Integer ttl)
ColumnPrefixUniquenessConstraint<K>	withUniqueId(java.lang.String unique) Specify the unique value to use for the column name when doing the uniqueness constraint.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

ColumnPrefixUniquenessConstraint

public ColumnPrefixUniquenessConstraint(com.netflix.astyanax.Keyspace keyspace,
                                com.netflix.astyanax.model.ColumnFamily<K,java.lang.String> columnFamily,
                                K key)

Method Detail

withTtl

public ColumnPrefixUniquenessConstraint<K> withTtl(java.lang.Integer ttl)

withConsistencyLevel

public ColumnPrefixUniquenessConstraint<K> withConsistencyLevel(com.netflix.astyanax.model.ConsistencyLevel consistencyLevel)

withPrefix

public ColumnPrefixUniquenessConstraint<K> withPrefix(java.lang.String prefix)

withUniqueId

public ColumnPrefixUniquenessConstraint<K> withUniqueId(java.lang.String unique)

Specify the unique value to use for the column name when doing the uniqueness constraint. In many cases this will be a TimeUUID that is used as the row key to store the actual data for the unique key tracked in this column family.

Parameters:

unique -

Returns:

readUniqueColumn

public java.lang.String readUniqueColumn()
                                  throws java.lang.Exception

Throws:

java.lang.Exception

acquire

public void acquire()
             throws NotUniqueException,
                    java.lang.Exception

Description copied from interface: UniquenessConstraint

Acquire the row(s) for uniqueness. Call release() when the uniqueness on the row(s) is no longer needed, such as when deleting the rows.

Specified by:

acquire in interface UniquenessConstraint

Throws:

NotUniqueException

java.lang.Exception

acquireAndMutate

@Deprecated
public void acquireAndMutate(com.netflix.astyanax.MutationBatch m)
                      throws NotUniqueException,
                             java.lang.Exception

Deprecated. Use acquireAndExecuteMutation instead to avoid timestamp issues

Description copied from interface: UniquenessConstraint

Acquire the uniqueness constraint and apply the final mutation if the row is found to be unique

Specified by:

acquireAndMutate in interface UniquenessConstraint

Throws:

NotUniqueException

java.lang.Exception

acquireAndApplyMutation

public void acquireAndApplyMutation(com.google.common.base.Function<com.netflix.astyanax.MutationBatch,java.lang.Boolean> callback)
                             throws NotUniqueException,
                                    java.lang.Exception

Description copied from interface: UniquenessConstraint

Acquire the uniqueness constraint and call the mutate callback to fill a mutation.

Specified by:

acquireAndApplyMutation in interface UniquenessConstraint

Throws:

NotUniqueException

java.lang.Exception

release

public void release()
             throws java.lang.Exception

Description copied from interface: UniquenessConstraint

Release the uniqueness lock for this row. Only call this when you no longer need the uniqueness lock

Specified by:

release in interface UniquenessConstraint

Throws:

java.lang.Exception