java.lang.Object
- com.hybris.ymkt.recommendation.services.ImpressionService

```
public class ImpressionService
extends java.lang.Object
```
This service is responsible to record/track, aggregate and send recommendations seen/printed to the users.

Field Summary

Fields
Modifier and Type	Field	Description
`protected long`	`aggregationTimeWindow`
`protected static int`	`MAX_FAILURE`
`protected ModelService`	`modelService`
`protected ODataService`	`oDataService`
`protected int`	`readBatchSize`
`protected RecommendationBufferService`	`recommendationBufferService`
`protected int`	`sendBatchSize`

Constructor Summary

Constructors
Constructor Description

ImpressionService()

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`aggregateImpressions()`	Aggregate individual impressions, save the aggregated impressions and delete the individual impressions.
`protected java.util.List<SAPRecoImpressionAggrModel>`	`aggregateImpressionsByScenario(java.util.List<SAPRecoImpressionModel> impressionsList)`	Aggregates impressions by scenario and aggregationTimeStamp Aggregation timestamp is the midpoint of the time window based on the current time e.g. Current time = 1:04:32.512 Time window = 5 minutes AggregatedTimeStamp = 1:02:30 (midpoint between 1:00 and 1:05)
`protected long`	`calcMidTimeStamp(long datetime)`
`boolean`	`postImpression(SAPRecoImpressionAggrModel aggregatedImpression)`	Send aggregated impression via oData
`void`	`saveImpression(ImpressionContext impressionContext)`	Save individual impressions when UI component is viewed
`void`	`sendAggregatedImpressions()`	Get aggregated impressions for sending via oData. If successfully sent, delete it.
`void`	`setAggregationTimeWindow(long aggregationTimeWindow)`
`void`	`setModelService(ModelService modelService)`
`void`	`setODataService(ODataService oDataService)`
`void`	`setReadBatchSize(int readBatchSize)`
`void`	`setRecommendationBufferService(RecommendationBufferService recommendationBufferService)`
`void`	`setSendBatchSize(int sendBatchSize)`

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - MAX_FAILURE
```
protected static final int MAX_FAILURE
```
    See Also:
    
    Constant Field Values
  - aggregationTimeWindow
```
protected long aggregationTimeWindow
```
  - modelService
```
protected ModelService modelService
```
  - oDataService
```
protected ODataService oDataService
```
  - readBatchSize
```
protected int readBatchSize
```
  - recommendationBufferService
```
protected RecommendationBufferService recommendationBufferService
```
  - sendBatchSize
```
protected int sendBatchSize
```
- Constructor Detail
  - ImpressionService
```
public ImpressionService()
```
- Method Detail
  - aggregateImpressions
```
public void aggregateImpressions()
```
    Aggregate individual impressions, save the aggregated impressions and delete the individual impressions. Exceptions must be handles by the caller.
  - aggregateImpressionsByScenario
```
protected java.util.List<SAPRecoImpressionAggrModel> aggregateImpressionsByScenario(java.util.List<SAPRecoImpressionModel> impressionsList)
```
    Aggregates impressions by scenario and aggregationTimeStamp
    Aggregation timestamp is the midpoint of the time window based on the current time
    e.g.
    Current time = 1:04:32.512
    Time window = 5 minutes
    AggregatedTimeStamp = 1:02:30 (midpoint between 1:00 and 1:05)
    
    Parameters:
    
    impressionsList - List of SAPRecoImpressionModel
    
    Returns:
    
    aggregatedImpressionsList
  - calcMidTimeStamp
```
protected long calcMidTimeStamp(long datetime)
```
  - postImpression
```
public boolean postImpression(SAPRecoImpressionAggrModel aggregatedImpression)
```
    Send aggregated impression via oData
    
    Parameters:
    
    aggregatedImpression - SAPRecoImpressionAggrModel
    
    Returns:
    
    true if posting was a success, false otherwise.
  - saveImpression
```
public void saveImpression(ImpressionContext impressionContext)
```
    Save individual impressions when UI component is viewed
    
    Parameters:
    
    impressionContext - the impression data to save
  - sendAggregatedImpressions
```
public void sendAggregatedImpressions()
```
    Get aggregated impressions for sending via oData.
    If successfully sent, delete it. If sending failed, keep it for next time
  - setAggregationTimeWindow
```
public void setAggregationTimeWindow(long aggregationTimeWindow)
```
  - setModelService
```
public void setModelService(ModelService modelService)
```
  - setODataService
```
public void setODataService(ODataService oDataService)
```
  - setReadBatchSize
```
public void setReadBatchSize(int readBatchSize)
```
  - setRecommendationBufferService
```
public void setRecommendationBufferService(RecommendationBufferService recommendationBufferService)
```
  - setSendBatchSize
```
public void setSendBatchSize(int sendBatchSize)
```

Class ImpressionService

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

MAX_FAILURE

aggregationTimeWindow

modelService

oDataService

readBatchSize

recommendationBufferService

sendBatchSize

Constructor Detail

ImpressionService

Method Detail

aggregateImpressions

aggregateImpressionsByScenario

calcMidTimeStamp

postImpression

saveImpression

sendAggregatedImpressions

setAggregationTimeWindow

setModelService

setODataService

setReadBatchSize

setRecommendationBufferService

setSendBatchSize