com.caplin.streamlink

Interface ContainerSubscriptionParameters

All Superinterfaces:

RecordSubscriptionParameters, SubscriptionParameters

public interface ContainerSubscriptionParameters
extends RecordSubscriptionParameters

Defines the parameters used for Container subscriptions. To create an instance of ContainerSubscriptionParameters call the com.caplin.streamlink.StreamLink.createContainerSubscriptionParameters() method.

Method Summary

Methods

Modifier and Type	Method and Description
ContainerSubscriptionParameters	select(java.lang.String where, java.lang.String orderBy, java.lang.String groupBy) Allow selection, sorting and grouping of containers.
ContainerSubscriptionParameters	setWindow(int start, int size) Sets the size of the container window.

Methods inherited from interface com.caplin.streamlink.RecordSubscriptionParameters

setFields, setFilter

Method Detail

setWindow

ContainerSubscriptionParameters setWindow(int start,
                                        int size)

Sets the size of the container window.

Parameters:

start - The index of the first container element within the window, where the first container element has an index value of 0 (zero).

size - The maximum number of container elements within the window.

Returns:

The update ContainerSubscriptionParameters object to permit a fluent programming style.

select

ContainerSubscriptionParameters select(java.lang.String where,
                                     java.lang.String orderBy,
                                     java.lang.String groupBy)

Allow selection, sorting and grouping of containers.

Example: params.select('bid>123&ask<122', "bid ASC NUMBER, ask DESC NUMBER", "bid" )

The static ContainerFilterFactory can be used to build a FilterExpression whose toFilterString method will generate a where clause in the required format.

Note: this method will only work if the backend has the Caplin Refiner installed.

The following example shows how to build an expression for FIELD1 > 0.1 AND FIELD3 = "a a"

ContainerSubscriptionParameters containerSubscriptionParameters = streamLink.createContainerSubscriptionParameters();

FilterExpression exp1 = ContainerFilterFactory.create("FIELD1", FilterExpressionOperator.GREATER_THAN, "0.1");
FilterExpression exp2 = ContainerFilterFactory.create("FIELD3", FilterExpressionOperator.EQUAL, "a a");
FilterExpression exp1Andexp2 = ContainerFilterFactory.createLogical(FilterExpressionLogicalOperator.AND, exp1, exp2);

containerSubscriptionParameters.select(exp1Andexp2.toFilterString(), "FIELD1", null);

Subscription subscription = streamlink.subscribe("/container", subscriptionListener, containerSubscriptionParameters);

Parameters:

where - The where clause, in the form required by Caplin Refiner (example 'bid>123&ask<222').

orderBy - The sorting order of the returned container in the form: field [ASC or DESC] [NUMBER or TEXT], ... example: bid DESC NUMBER,ask ASC NUMBER

groupBy - The group by clause in the form: field example: bid

Returns:

The update ContainerSubscriptionParameters object to permit a fluent programming style.