Spring Services

hSenid Lanka: Spring Services


What is Spring?

What Does Spring Offer?

Spring Services

Task Execution and Scheduling

Demo-Scheduling

Email

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Demo-Email

Data Access With JDBC

Demo-Data Access

Transaction Management

Demo-Database Transaction


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• Spring is an open source layered Java/J2EE application

framework.

• Philosophy: J2EE should be easier to use,

“Lightweight Container” concept

• Spring performs two major roles for a Java

application.


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• A Container

o Creates objects and makes them available to your

application.

First Spring is a container that manages all or

some of the objects used by the application.

Behind the scenes Spring configures your objects

with what they need to in order to perform their

roles in the application.


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• A Framework

o Provides an infrastructure of classes that make

it easier to accomplish tasks.

Spring is also a framework because it provides

libraries of classes that make it easier to

accomplish common tasks such as transaction

management, database integration, email, and web

applications.


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• Lightweight container and framework.

• Manages dependencies between your objects.

o Encourages use of interfaces

o Lessens “coupling” between objects

• Providing services to simplify tasks.

o Task scheduling

o Email sending

o Data access

o Database Transaction


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• Where to use scheduling?

o Generate periodic reports

o Invoke batch process

o Execute periodic application maintenance tasks

• Spring provides support for scheduling

• Quartz: Open source solution by OpenSymphony

• Trigger: SimpleTrigger, CronTrigger, etc.


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1.Using the MethodInvokingJobDetailFactoryObject

2.Using Annotations

3.Using Quartz Scheduler

4.Using Trigger (SimpleTrigger, CronTrigger)


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• The Spring Framework provides a helpful utility library for sending

email.

• The org.springframework.mail package is the root level package for

the Spring Framework’s email support.Timers: Java's built in

scheduler

• The central interface for sending emails is the MailSender

interface; a simple value object encapsulating the properties of a

simple mail such as from and to (plus many others) is the

SimpleMailMessage class.


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1.Textual Email

2.Email with attachment


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Action Spring You

Define connection parameters. X

Open the connection. X

Specify the SQL statement. X

Declare parameters and provide parameter values X

Prepare and execute the statement. X

Set up the loop to iterate through the results (if any). X

Do the work for each iteration. X

Process any exception. X

Handle transactions. X

Close the connection, statement and resultset. X


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• The JdbcTemplate class is the central class in the JDBC core

package.

• It simplifies the use of JDBC since it handles the creation and

release of resources.

• This helps to avoid common errors such as forgetting to always

close the connection.

• It executes the core JDBC workflow like statement creation and

execution, leaving application code to provide SQL and extract

results.


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• Data Integrity.

• Consistency.

• Data and Resources may be corrupted and left in an

inconsistent state.

• Important for recovering from unexpected errors in a

concurrent and distributed environment.


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• The concept of transactions can be described with

following four key properties.

Atomicity

Consistency

Isolation

Durability


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• Atomicity

o A transaction should be treated as a single unit of operation

which means either the entire sequence of operations is

successful or unsuccessful.

• Consistency

o Once all actions of a transaction have completed, the

transaction is committed. Then your data and resources will be

in a consistent state that confirms to business rules.


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• Isolation

o Because there may be many transactions processing with the same

data set at the same time, each transaction should be isolated

from others to prevent data corruption.


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• Durability

o Once a transaction has completed, the results of this

transaction have to be made permanent and cannot be erased

from the database due to system failure.(imagine if the

power to your machine was cut right in the middle of a

transaction’s commit). Usually, the result of a

transaction is written to persistent storage.


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• Brief Introduction to Spring

• Spring Services

• Scheduling (Annotations, Quartz, Trigger,

MethodInvokingJobDetailFactoryObject)

• Email (With and without an attachment)

• Data Accessing

• Database Transaction


Demo projects can be found in GitHub

• Spring Scheduling - MethodInvokingTimerTaskFactoryBean

• Spring Scheduling – Annotation based

• Spring Scheduling – Simple, Quartz and Cron triggers

• Spring JDBC Template with Transaction Management

https://github.com/kasundm5566/Spring-Scheduling-MethodInvokingTimerTaskFactoryBean.git

https://github.com/kasundm5566/Spring-Scheduling-Annotation-Based.git

https://github.com/kasundm5566/Spring-Scheduling-Quartz-Cron-Trigger-Simple-Trigger.git

https://github.com/kasundm5566/Spring-JDBCTemplate-With-Transaction-Management.git

Spring Services

Software

Transcript of Spring Services