#include <coherence/util/aggregator/PriorityAggregator.hpp>
Inherits AbstractPriorityTask, and InvocableMap::ParallelAwareAggregator.
For example, let's assume that there is an Orders cache that belongs to a partitioned cache service configured with a request-timeout and task-timeout of 5 seconds. Also assume that we are willing to wait longer for a particular aggregation request that scans the entire cache. Then we could override the default timeout values by using the PriorityAggregator as follows:
Float64Average::Handle aggrStandard =
Float64Average::create(ReflectionExtractor::create("getPrice"));
PriorityAggregator::Handle aggrPriority =
PriorityAggregator::create(aggrStandard);
aggrPriority->setExecutionTimeoutMillis(PriorityTask::timeout_none);
aggrPriority->setRequestTimeoutMillis(PriorityTask::timeout_none);
cacheOrders->aggregate(NULL, aggrPriority);
This is an advanced feature which should be used judiciously.
Public Types | ||||
| typedef spec::Handle | Handle | |||
| PriorityAggregator Handle definition. | ||||
| typedef spec::View | View | |||
| PriorityAggregator View definition. | ||||
| typedef spec::Holder | Holder | |||
| PriorityAggregator Holder definition. | ||||
Public Member Functions | ||||
| virtual Object::Holder | aggregate (Set::View vSetEntries) | |||
| Process a set of InvocableMap::Entry objects in order to produce an aggregated result.
| ||||
|
virtual InvocableMap::EntryAggregator::Handle | getParallelAggregator () | |||
| Get an aggregator that can take the place of this aggregator in situations in which the InvocableMap can aggregate in parallel.
| ||||
| virtual Object::Holder | aggregateResults (Collection::View vCollResults) | |||
| Aggregate the results of the parallel aggregations.
| ||||
| virtual void | readExternal (PofReader::Handle hIn) | |||
| virtual void | writeExternal (PofWriter::Handle hOut) const | |||
|
virtual TypedHandle < const String > | toString () const | |||
| Output a human-readable description of this Object to the given stream. Note that when overriding this method the return type must be TypedHandle<const String> rather then String::View. These two types are assignment compatible but not equivalent and declaring the override with String::View will not be a compatible override. coherence::lang::operator<<(std::ostream, Object::View) is defined and will call into the toString method, to output Objects. If a managed String object is desired, the COH_TO_STRING macro can be used to build up a String from streamable contents and is generally how toString() will be implemented.
Object::View vKey = ... Object::View vValue = ... std::cout << vKey << " = " << vValue << std::endl; String::View vs = COH_TO_STRING(vKey << " = " << vValue); The COH_TO_STRING macro is also the most common way to implement the toString method. For example:
virtual TypedHandle<const String> Person::toString() const { return COH_TO_STRING("Name: " << f_sName << " SSN: " << f_nSSN); }
| ||||
| virtual InvocableMap::ParallelAwareAggregator::Handle | getAggregator () | |||
| Obtain the underlying aggregator. | ||||
| virtual InvocableMap::ParallelAwareAggregator::View | getAggregator () const | |||
| Obtain the underlying aggregator. | ||||
Protected Member Functions | ||||
| PriorityAggregator () | ||||
| Default constructor (necessary for the PortableObject interface). | ||||
| PriorityAggregator (InvocableMap::ParallelAwareAggregator::Handle hAggregator) | ||||
| Construct a PriorityAggregator. | ||||
| PriorityAggregator | ( | InvocableMap::ParallelAwareAggregator::Handle | hAggregator | ) | [protected] |
Construct a PriorityAggregator.
| hAggregator | the aggregator wrapped by this PriorityAggregator |
| virtual InvocableMap::ParallelAwareAggregator::Handle getAggregator | ( | ) | [virtual] |
| virtual InvocableMap::ParallelAwareAggregator::View getAggregator | ( | ) | const [virtual] |