## +21 ## Back to Basics: The Factory Pattern ## MIKE SHAH 2021 October 24-29 ## Please do not redistribute slides without prior permission ## Software Design: Factory Pattern Mike Shah, Ph.D. @MichaelShah pattern that can help solve this problem--the factory design pattern. In this talk, we are going to discuss a creationally designed pattern known as a factory. The pattern can be as simple as a function function, or take on other forms as a distributed factory, or an abstract factory. We'll show some basic examples of a factory in modern C++ as well as real world use cases of where factories occur for further

type determination for "factory-method" into "_{-\text{getTypeForFactoryMethod}}" template * AbstractBeanFactory does not create beans with "factory-method" if the type can clearly statically * AbstractAutowireCapableBeanFactory correctly indicates "constructor" or "factory method" in debug log messages * AbstractAutoWireCapableBeanFactory prefers raw arg leBeanFactory throws BeanCreationException if a factory method returned null * DefaultListableBeanFactory does not create beans with "factory-bean" for type check if "includeFactoryBeans"=false

when triggered by singleton init method (SPR-14324) fixed Deadlock while creating a new thread on bean initialization with transactional code invocation (SPR-14388) fixed CronSequenceGenerator causes doesn't override HashMap.clone() (SPR-14509) fixed StackOverflowError for advisor search against factory-bean reference to FactoryBean (SPR-14551) fixed StringUtils.parseLocaleString(): does not parse locale (SPR-14349) improved Normalize resource URL in ResourceServlet (SPR-14946) improved documentation for @Bean(automwire=NO) (SPR-14282) improved documentation Label "for" attribute is wrongly documented

SpringBeanELResolver.setValue throws PropertyNotWritableException issue (SPR-11502) optimized handling of @Bean method override regression with return type narrowing on JDK 8 (SPR-11718) prevented double evaluation and JRubyScriptUtils (SPR-11721, SPR-11517, SPR-11747) consider parent definitions with overriding bean definition message (SPR-9671( improved exception message for failed property access in SpEL (SPR-11535) (SPR-11351) * handle NoClassDefFoundError for TestExecution Listeners consistently (SPR-11347) * fixed @Bean meta-annotation detection when using ASM (SPR-10488) * provide access to SimpleTriggerFactoryBean

attribute * fixed potential race condition in concurrent calling of autowired methods on a prototype bean * cancel on a Future returned by a TaskScheduler works reliably * LoadTimeWeaverAware beans are listeners and enabled/disabled flags to existing cache regions as well * added "repeatCount" bean property to Quartz SimpleTriggerFactoryBean * support executor qualification with @Async#value * and MVC data binding provide support for * restored SpringValidatorAdapter's ability to handle bean constraints with property paths * added MethodValidationInterceptor/PostProcessor for Hibernate

springsource.org #### Changes in version 3.2.5 (2013-11-06) * fixed type prediction for generic factory method with conversion of method arguments (SPR-10411) * fixed GenericTypeResolver issues relating ..} placeholders as well (SPR-10686) * BeanFactory's getBeansWithAnnotation ignores abstract bean definitions (SPR-10672) * fixed regression with non-String value attributes on custom stereotypes annotation in superclasses and interfaces (SPR-10514) * fixed regression with type detection for child bean definitions (SPR-10374) * fixed configuration class overriding in terms of superclasses (SPR-10546)

beans * factored out BeanDefinitionVisitor from PropertyPlaceholderConfigurer, making the bean definition traversal reusable * ConstructorArgumentValues holds generic ValueHolders in a List instead CGLIB-defined bean properties (-> method injection) from dependency checks * reworked ResourceEntityResolver to depend on ResourceLoader only and moved it to package "beans.factory.xml" * proprietary JMX Helper * reworked MBeanInfoAssembler interface to take a managed bean instance as argument instead of just the bean class * reworked AbstractMBeanInfoAssembler and subclasses to expose proper

explicit about what to do in case of a type mismatch (SPR-12145) fixed plain FactoryBean declaration on @Bean method leads to early call (pre injection) (SPR-12141) fixed performance issue on ResolvableType interdependent setters (SPR-12026) fixed documentation typo (SPR-12020) fixed Spring may invoke @Bean methods too early in case of a circular reference (SPR-12018) fixed RestTemplate with InputStreamResource when there is no path (SPR-11970) fixed getBean(Object.class) fails when introspecting Environment bean (SPR-10542) fixed injecting EXTENDED @PersistenceContext into JUnit 4 test class causes NoSuchBe

Control (IoC) container ..... 20 2.2.1. Easier XML configuration ..... 20 2.2.2. New bean scopes ..... 20 2.2.3. Extensible XML authoring ..... 21 2.3. Aspect Oriented Programming Injecting dependencies ..... 36 3.3.2. Constructor Argument Resolution ..... 40 3.3.3. Bean properties and constructor arguments detailed ..... 42 3.3.4. Using depends-on ..... 50 3.3.7. Checking for dependencies ..... 53 3.3.8. Method Injection ..... 54 3.4. Bean scopes ..... 57 3.4.1. The singleton scope ..... 57 3.4.2. The prototype scope

Inversion of Control (IoC) container ..... 20 2.2.1. Easier XML configuration ..... 20 2.2.2. New bean scopes ..... 20 2.2.3. Extensible XML authoring ..... 21 2.3. Aspect Oriented Programming (AOP) 3.3.1. Injecting dependencies ..... 36 3.3.2. Constructor Argument Resolution ..... 41 3.3.3. Bean properties and constructor arguments detailed ..... 42 3.3.4. Using depends-on ..... 50 3.3.5 collaborators ..... 52 3.3.7. Checking for dependencies ..... 53 3.3.8. Method Injection ..... 54 3.4. Bean scopes ..... 57 3.4.1. The singleton scope ..... 58 3.4.2. The prototype scope ..... 59 3.4