BUILD&HIGHLY&SCALABLE&ORACLE&ADF APPLICATIONS&

Copyright © 2014, eProseed and/or its affiliates. All rights reserved. | Confiden?al

BUILD HIGHLY SCALABLE ORACLE ADF APPLICATIONS Eugene Fedorenko


Eugene Fedorenko Master principal R&D architect

adfpracGce-‐fedor.blogspot.com

@fisbudo

2

ABOUT ME

Copyright © 2014, eProseed and/or its affiliates. All rights reserved. | Confiden?al 3

WHAT IS A SCALABLE APPLICATION


HEALTHY JAVA EE APPLICATION Healthy Unhealthy


AGENDA

JVM memory management

UI Tree. The lifespan of ADF Faces components

Memory scopes. The lifespan of managed beans

ADF Controller. Task flow ini?a?on.

ADF Model. The lifespan of ADF Bindings.

ADF BC. The lifespan of Business Components

GC strategies. Decision matrix.

JVM scaling

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START


THE HEAP 0

Hard Reference SoZ Reference Weak Reference

java –Xms:4G –Xmx:8G

-‐Xms

-‐Xmx


GARBAGE COLLECTOR

Mark

Sweep

Reachable SoZly Reachable Weakly Reachable


ADF LAYERS

ADF Faces

ADF Bindings

ADF Data Controls

ADF Task Flows

ADF Business Components


JSF LIFECYCLE VS ADF PAGE LIFECYCLE


UI TREE LIFESPAN •  Created on ini?al page request •  Stored in FacesContext un?l refresh or redirect

public class EditViewBean { private RichInputText inputText;


UI COMPONENT REFERENCE •  Use ComponentReference to hold the UI component reference –  Serializable –  Avoids hard references to UI components

•  Good enough for any memory scope

public class EditViewBean { private ComponentReference inputTextReference; public void setInputText(RichInputText inputText) { inputTextReference = ComponentReference.newUIComponentReference(inputText); } public RichInputText getInputText() { return (inputTextReference == null ? null : (RichInputText) inputTextReference.getComponent()); }


AGENDA








JVM scaling

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BACKINGBEAN SCOPE •  Exists for the dura?on of a request •  Each region or declara?ve component has its own instance

Region1

#{backingBeanScope.sampleBean}

SampleTaskFlow

Region2

#{backingBeanScope.sampleBean}

SampleTaskFlow

Request


REQUEST SCOPE •  Exists for the dura?on of a request •  Only one instance of the scope across the request

Region1 SampleTaskFlow

Region2

#{sampleBean}

SampleTaskFlow

Request


VIEW SCOPE •  Lives longer than request •  Exists un?l naviga?on to another view •  Not the same as JSF “View” scope

SampleTaskFlow

#{viewScope.view1Bean}

View1

#{viewScope.mainPageBean}

View1 View1 Method Call1 View2

#{viewScope.view2Bean}

Request Request


FLASH SCOPE •  Lives longer than request •  Exists across a single view transi?on •  Survives redirects

Page 1

#{flash.transi?onBean}

Request Request

Page 2

Redirect


PAGEFLOW SCOPE •  Exists for the dura?on of a task flow •  Each task flow has its own instance

SampleTaskFlow View1

#{pageFlowScope.sampleTaskFlowBean}

View1 View1 Method Call1 View2

Request Request


SESSION SCOPE •  Exists for the dura?on of a user session

Hmp Session Page1

#{userDataBean}

Page2 Page2 TaskFlow Call1 Page3

Request Request


APPLICATION SCOPE •  Exists for the dura?on of a user session

Applica?on

User Session1

#{applica?onDataBean}

User Session2 User Session3

User Session4 User Session5 User Session6


•  Available for GC immediately •  Used to serve longer scopes

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NONE SCOPE <managed-‐bean id="__1">

<managed-‐bean-‐name>ServingBean</managed-‐bean-‐name>

<managed-‐bean-‐class>view.ServingBean</managed-‐bean-‐class>

<managed-‐bean-‐scope>none</managed-‐bean-‐scope>

</managed-‐bean>

<managed-‐bean id="__2">

<managed-‐bean-‐name>FlowBean</managed-‐bean-‐name>

<managed-‐bean-‐class>view.FlowBean</managed-‐bean-‐class>

<managed-‐bean-‐scope>pageFlow</managed-‐bean-‐scope>

<managed-‐property>

<property-‐name>servingBean</property-‐name>

<value>#{ServingBean}</value>

</managed-‐property>

</managed-‐bean>


AGENDA




ADF Controller. Task flow iniGaGon.




JVM scaling

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•  Immediate –  Ac?vates task flow on ini?al page display –  <…ac?va?on=”immediate” …>

•  Deferred –  <…ac?va?on=”deferred” …> –  Applicable for Facelet pages only (*.jsf) –  Enables lazy task flow loading

•  Condi?onal –  <…ac?va?on=”condi?onal” ac?ve=”#{ELExpression}”…> –  Ac?vates task flow if #{ELExpression} is true

<af:region value=”#{bindings. bv1.regionModel}” id=”reg1"/>

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ADF TASK FLOW ACTIVATION

<taskFlow id=”bv1” taskFlowId=”/WEB-‐INF/…”

ac?va?on=”deferred” />


ADF LAYERS

ADF Faces

ADF Bindings

ADF Data Controls

ADF Task Flows



BINDINGS IN ADF LIFECYCLE. ADF BINDING FILTER


BINDINGS IN ADF LIFECYCLE. RESTORE VIEW •  Restore View •  Apply Request Values •  Process valida?ons •  Update Model Values •  Invoke Applica?on •  Render Response


BINDINGS IN ADF LIFECYCLE. RESTORE VIEW •  Restore View -‐ Init Context -‐ Prepare Model •  …


BINDING CONTAINER AT PREPARE MODEL •  Page Parameters •  Task Flow Parameters

•  Executables with Refresh=prepareModel – Iterators, Invoke Ac?ons

•  Page Template

•  Task Flow bindings


BINDINGS IN ADF LIFECYCLE. RENDER RESPONSE •  Restore View •  Apply Request Values •  Process valida?ons •  Update Model Values •  Invoke Applica?on •  Render Response -‐ Prepare render (render Model)

Refresh=renderModel Refresh=default (deferred)


ADF LAYERS

ADF Faces

ADF Bindings

ADF Data Controls

ADF Task Flows



•  By default loads all components immediately •  Switch to lazy components loading –  java –D jbo.load.components.lazily = true –  LoadComponentsLazily = true

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ADF BC AM LOADING

Applica?on Module

View Object

Nested Applica?on Module

En?ty Cache

En?ty Object


ADF BC AM POOL

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U1 U2 U7 U4 U5 U3 U6 U9 U8

Assigned to User Session Unassigned


ADF BC AM POOL

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U0 U2 U7 U4 U5 U3 U6 U9 U8 U10 U11 U12 U13

Recycle Threshold

U1

Passiva?on Ac?va?on

Assigned to User Session Unassigned In Use


ADF BC AM POOL

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U0 U2 U7 U4 U5 U3 U6 U9 U8 U10 U11 U12 U13

Recycle Threshold

U1 U14 U15 U16

Assigned to User Session Unassigned In Use


ADF BC AM POOL MONITOR

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•  Scans every jbo.ampool.monitorsleepinterval ms

•  Removes inac?ve for jbo.ampool.maxinacGveage ms AMs

•  Tries to keep the range jbo.ampool.minavailablesize -‐ jbo.ampool.maxavailablesize

•  AMs live not longer than jbo.ampool.Gmetolive ms –  Should be set jbo.ampool.Gmetolive = -‐1

U0 U2 U7 U5 U3 U6 U9 U8 U10 U11 U12 U13 U1 U14 U15 U16

Max Available Size Min Available Size

U4


ADF BC VIEW OBJECTS

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En?ty Cache

En?ty Object

Row Set

Row

View Object

Applica?on Module


ADF BC VIEW OBJECTS

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En?ty Object

Row Set

Row

View Object

Applica?on Module

Query Collec?on Cache

Query Collec?on

Default Row Set Secondary Row Set


SHARED QUERY COLLECTION POOL MONITOR

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•  Scans every jbo.qcpool.monitorsleepinterval ms

•  Removes inac?ve for jbo.qcpool.maxinacGveage ms QCs

•  Tries to keep the total weight below jbo.qcpool.maxweight

En?ty Object

View Object

Applica?on Module

Query Collec?on Cache

Query Collec?on


ADF BC ENTITY OBJECTS

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•  En?ty Cache is java.u?l.WeakHashMap

•  Unmodified en??es are weekly referenced

•  Modified en??es are strongly referenced

En?ty Cache

Unmodified En?ty

Modified En?ty

Query Collec?on

DB Transac?on


AGENDA








JVM scaling

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GENERATIONAL PARALLEL GARBAGE COLLECTOR Nursery (Young Generation) Tenured (Old Generation)

Young CollecGon

Old CollecGon

Reachable SoZly Reachable Weakly Reachable Garbage

0

-Xns -Xmx


CONCURRENT GARBAGE COLLECTOR: MARK

2. Concurrent Marking

1. IniGal Marking

3. Precleaning

4. Final Marking

-Xns

-Xmx

Weakly Reachable SoZly Reachable Reachable Garbage


CONCURRENT GARBAGE COLLECTOR: SWEEP

1. Sweep first half

2. Switch halves

3. Sweep second half

4. Synchronize

Reachable SoZly Reachable Weakly Reachable Garbage

-Xns

-Xmx


GC POLICIES •  Parallel Garbage Collector –  High performance between collec?ons –  Short collec?on dura?on but long pauses –  Good for applica?ons with high throughput requirement. Batch processing.

•  Concurrent Garbage Collector –  Sharing CPU between GC and Java threads –  Long collec?on dura?on but short pauses –  Good for applica?ons sensi?ve to long pauses. Transac?on based systems

•  Single-‐genera?onal Garbage Collector –  All garbage is collected at once –  Good for set of stable long living objects

•  Two-‐genera?onal Garbage Collector –  Short-‐living objects live short –  Good for applica?ons with large number of temporary objects


WHAT IS GOOD FOR ADF?

Sensitive to long pauses?

Yes No

A lo

t of

tem

por

ary

obje

cts?

No

Yes

Generational Concurrent

-Xgc:gencon

Single Concurrent

-Xgc:singlecon

Generational Parallel

-Xgc:genpar

Single Parallel

-Xgc:singlepar


500 users per JVM 4g Heap

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VERTICAL AND HORIZONTAL SCALING


Q&A








JVM scaling

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BUILD&HIGHLY&SCALABLE&ORACLE&ADF APPLICATIONS&