com.jcabi.dynamo.Frame Maven / Gradle / Ivy
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package com.jcabi.dynamo;
import com.amazonaws.services.dynamodbv2.model.Condition;
import com.jcabi.aspects.Immutable;
import java.util.Collection;
import java.util.Map;
/**
* DynamoDB frame (subset of a table).
*
* {@link Frame} is a subset of a Dynamo table, and is used to retrieve items
* and remove them. {@link Frame} acts as an iterable immutable collection of
* items. You can't use {@link Frame#remove(Object)} method directly. Instead,
* find the right item using iterator and than remove it with
* {@link java.util.Iterator#remove()}.
*
*
To fetch items from Dynamo DB, {@link Frame} uses
* {@code Query} operation, with "consistent read" mode turned ON. It fetches
* twenty items on every request.
*
*
Keep in mind that Frame object provides a very limited functionality
* and is intended to be used in most cases, but not in all of them. When
* you need something specific, just get an Amazon DynamoDB client from
* a {@link Region} and use Amazon SDK methods directly.
*
* @since 0.1
* @see Item
* @see Query and Scan
*/
@Immutable
public interface Frame extends Collection- {
/**
* Refine using this EQ condition argument.
* @param name Attribute name
* @param value String value expected
* @return New frame
* @since 0.7.21
*/
Frame where(String name, String value);
/**
* Refine using this condition.
*
*
It is recommended to use a utility static method
* {@link Conditions#equalTo(Object)}, when condition is simply an
* equation to a plain string value.
*
* @param name Attribute name
* @param condition The condition
* @return New frame
*/
Frame where(String name, Condition condition);
/**
* Refine using these conditions.
*
*
It is recommended to use {@link Conditions} supplementary class
* instead of a raw {@link Map}.
*
* @param conditions The conditions
* @return New frame
* @see Conditions
*/
Frame where(Map conditions);
/**
* Get back to the table this frame came from.
* @return The table
*/
Table table();
/**
* Change valve for items fetching.
* @param valve The valve to go through
* @return New frame
* @since 0.7.21
*/
Frame through(Valve valve);
}