BUILD&HIGHLY&SCALABLE&ORACLE&ADF APPLICATIONS&

transcript

BUILD HIGHLY SCALABLE ORACLE ADF APPLICATIONS Eugene Fedorenko

Eugene Fedorenko Master principal R&D architect

adfpracGce-‐fedor.blogspot.com

@fisbudo

ABOUT ME

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

THE HEAP 0

Hard Reference SoZ Reference Weak Reference

java –Xms:4G –Xmx:8G

-‐Xms

-‐Xmx

GARBAGE COLLECTOR

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

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}

#{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

#{flash.transi?onBean}

Request Request

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 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

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

•  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"/>

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

ADF BC AM LOADING

Applica?on Module

View Object

Nested Applica?on Module

En?ty Cache

En?ty Object

ADF BC AM POOL

U1 U2 U7 U4 U5 U3 U6 U9 U8

Assigned to User Session Unassigned

ADF BC AM POOL

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

Recycle Threshold

Passiva?on Ac?va?on

Assigned to User Session Unassigned In Use

ADF BC AM POOL

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

•  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

ADF BC VIEW OBJECTS

En?ty Cache

En?ty Object

Row Set

View Object

Applica?on Module

ADF BC VIEW OBJECTS

En?ty Object

Row Set

View Object

Applica?on Module

Query Collec?on Cache

Query Collec?on

Default Row Set Secondary Row Set

SHARED QUERY COLLECTION POOL MONITOR

•  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

•  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

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

Young CollecGon

Old CollecGon

Reachable SoZly Reachable Weakly Reachable Garbage

-Xns -Xmx

CONCURRENT GARBAGE COLLECTOR: MARK

2. Concurrent Marking

1. IniGal Marking

3. Precleaning

4. Final Marking

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

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

Generational Concurrent

-Xgc:gencon

Single Concurrent

-Xgc:singlecon

Generational Parallel

-Xgc:genpar

Single Parallel

-Xgc:singlepar

500 users per JVM 4g Heap

VERTICAL AND HORIZONTAL SCALING

JVM scaling

BUILD&HIGHLY&SCALABLE&ORACLE&ADF APPLICATIONS&

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