com.jcabi.dynamo

Class QueryValve

java.lang.Object

com.jcabi.dynamo.QueryValve

All Implemented Interfaces:

Valve

@Immutable
@Loggable(value=1)
public final class QueryValve
extends Object
implements Valve

Query-based valve.

Since:

0.1

Version:

$Id: 6b61c33dfec8eddb030f320f015503ceb7a26000 $

Author:

Yegor Bugayenko (yegor@tpc2.com)

Constructor Summary

Constructors

Constructor and Description
QueryValve() Public ctor.

Method Summary

Methods

Modifier and Type	Method and Description
int	count(Credentials credentials, String table, Map<String,com.amazonaws.services.dynamodbv2.model.Condition> conditions) Count items.
Dosage	fetch(Credentials credentials, String table, Map<String,com.amazonaws.services.dynamodbv2.model.Condition> conditions, Collection<String> keys) Fetch the first dosage.
QueryValve	withAttributesToGet(String... names) With these extra attributes to pre-fetch.
QueryValve	withAttributeToGet(String name) With this extra attribute to pre-fetch.
QueryValve	withConsistentRead(boolean cnst) With consistent read.
QueryValve	withIndexName(String idx) With index name.
QueryValve	withLimit(int lmt) With given limit.
QueryValve	withScanIndexForward(boolean fwd) With scan index forward flag.
QueryValve	withSelect(com.amazonaws.services.dynamodbv2.model.Select slct) With attributes to select.

Methods inherited from class java.lang.Object

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

Constructor Detail

QueryValve

public QueryValve()

Public ctor.

Method Detail

fetch

public Dosage fetch(Credentials credentials,
           String table,
           Map<String,com.amazonaws.services.dynamodbv2.model.Condition> conditions,
           Collection<String> keys)
             throws IOException

Description copied from interface: Valve

Fetch the first dosage.

Specified by:

fetch in interface Valve

Parameters:

credentials - Credentials to AWS

table - Table name

conditions - Conditions

keys - Keys of the table

Returns:

Dosage

Throws:

IOException - In case of DynamoDB failure

count

public int count(Credentials credentials,
        String table,
        Map<String,com.amazonaws.services.dynamodbv2.model.Condition> conditions)
          throws IOException

Description copied from interface: Valve

Count items.

Specified by:

count in interface Valve

Parameters:

credentials - Credentials to AWS

table - Table name

conditions - Conditions

Returns:

Total count of the

Throws:

IOException - In case of DynamoDB failure

withConsistentRead

public QueryValve withConsistentRead(boolean cnst)

With consistent read.

Parameters:

cnst - Consistent read

Returns:

New query valve

Since:

0.12

See Also:

QueryRequest.withConsistentRead(Boolean)

Suppressed Checkstyle violations:

AvoidDuplicateLiterals (5 line)

withIndexName

public QueryValve withIndexName(String idx)

With index name.

Parameters:

idx - Index name

Returns:

New query valve

Since:

0.10.2

See Also:

QueryRequest.withIndexName(String)

Suppressed Checkstyle violations:

AvoidDuplicateLiterals (5 line)

withSelect

public QueryValve withSelect(com.amazonaws.services.dynamodbv2.model.Select slct)

With attributes to select.

Parameters:

slct - Select to use

Returns:

New query valve

Since:

0.10.2

See Also:

QueryRequest.withSelect(Select)

Suppressed Checkstyle violations:

AvoidDuplicateLiterals (5 line)

withLimit

public QueryValve withLimit(int lmt)

With given limit.

Parameters:

lmt - Limit to use

Returns:

New query valve

See Also:

QueryRequest.withLimit(Integer)

Suppressed Checkstyle violations:

AvoidDuplicateLiterals (5 line)

withScanIndexForward

public QueryValve withScanIndexForward(boolean fwd)

With scan index forward flag.

Parameters:

fwd - Forward flag

Returns:

New query valve

See Also:

QueryRequest.withScanIndexForward(Boolean)

Suppressed Checkstyle violations:

AvoidDuplicateLiterals (5 line)

withAttributeToGet

public QueryValve withAttributeToGet(String name)

With this extra attribute to pre-fetch.

Parameters:

name - Name of attribute to pre-load

Returns:

New query valve

See Also:

QueryRequest.withAttributesToGet(Collection)

Suppressed Checkstyle violations:

AvoidDuplicateLiterals (5 line)

withAttributesToGet

public QueryValve withAttributesToGet(String... names)

With these extra attributes to pre-fetch.

Parameters:

names - Name of attributes to pre-load

Returns:

New query valve

See Also:

QueryRequest.withAttributesToGet(Collection)

Suppressed Checkstyle violations:

AvoidDuplicateLiterals (5 line)