OSGi器皿中Bundle之间Synchronous Communication

OSGi容器中Bundle之间Synchronous Communication

Xml代码

1. <?xml?version="1.0"?encoding="UTF-8"?>??
2. <blueprint?xmlns="http://www.osgi.org/xmlns/blueprint/v1.0.0">??
3. ????...??
4. </blueprint>??

???? 自定义配置文件地址：

???? Bundle-Blueprint: lib/account.xml, security.bp, cnf/*.xml

?

???? Mandatory dependencies：

???? OSGi Service 中Dependencies默认是必须的，但可通过设置reference和reference-list元素的availability为optional

???? 来改变这中现象。正常情况下，当Bluepring Container初始化时，通过一定范围的时间来允许Dependencies

???? Resolve, 该时间么哦人为：5秒，可通过下面的方式自定义：

Xml代码

1. Bundle-SymbolicName:?org.fusesource.example.osgi-client;??
2. blueprint.graceperiod:=true;??
3. blueprint.timeout:=?10000??

??? (2) Defining a Service Bean

??? (3) Exporting a Service

??? 1. Exporting with a single interface

Xml代码

1. <blueprint?xmlns="http://www.osgi.org/xmlns/blueprint/v1.0.0">??
2. ????<bean?id="savings"?class="org.fusesource.example.SavingsAccountImpl"?/>??
3. ????<service?ref="savings"?interface="org.fusesource.example.Account"?/>??
4. </blueprint>??

???? 2. Exporting with multiple interfaces

Xml代码

1. <blueprint?xmlns="http://www.osgi.org/xmlns/blueprint/v1.0.0">??
2. ??????
3. ????<bean?id="savings"?class="org.fusesource.example.SavingsAccountImpl"?/>??
4. ????<service?ref="savings">??
5. ????????<interfaces>??
6. ????????????<value>org.fusesource.example.Account</value>??
7. ????????????<value>org.fusesource.example.SavingsAccount</value>??
8. ????????</interfaces>??
9. ????</service>??
10. </blueprint>??

??? 注意：interface和interfaces不能同时在service元素中使用。

??? 3. Exporting with auto-export

??? 例如：下面的代码中Blueprint将自动注册所有SavingsAccountImpl实现的public接口：

Xml代码

1. <blueprint?xmlns="http://www.osgi.org/xmlns/blueprint/v1.0.0">??
2. ????<bean?id="savings"?class="org.fusesource.example.SavingsAccountImpl"?/>??
3. ????<service?ref="savings"?auto-export="interfaces"?/>??
4. </blueprint>??

???? 其中auto-export默认值为：disabled,其他可选值为：

???? interfaces：注册该类实现的所有public的接口；

???? class-hierarchy：注册该类自己以及他的父类，但不包含Object类；

???? all-classes：注册该类自己以及他的父类，同时包括该类实现的接口。

???? 4. Setting service properties

Xml代码

1. <blueprint?xmlns="http://www.osgi.org/xmlns/blueprint/v1.0.0">??
2. ????<bean?id="savings"?class="org.fusesource.example.SavingsAccountImpl"?/>??
3. ????<service?ref="savings"?auto-export="interfaces"?ranking="10">??
4. ????????<service-properties>??
5. ????????????<beans:entry?key="bank.name"?value="HighStreetBank"?/>??
6. ????????</service-properties>??
7. ????</service>??
8. </blueprint>??

? ? 说明：A.? 注册的service默认的Properties有：osgi.service.blueprint.compname值为service? bean 的id

? ? ? ? ? ? ? ? B.? service.ranking 是系统自动设置。

??????????????? C.? 当系统查找服务时返回对个匹配的服务时，默认选择ranking值最高的服务，因此可配置该属性用以服务

???? 之间的区分。

???? 5. Specifying a registration listener

Xml代码

1. <blueprint?xmlns="http://www.osgi.org/xmlns/blueprint/v1.0.0"?.>??
2. ????<bean?id="listenerBean"?class="org.fusesource.example.Listener"?/>??
3. ????<service?ref="savings"?auto-export="interfaces">??
4. ????????<registration-listener?ref="listenerBean"??
5. ????????????registration-method="register"?unregistration-method="unregister"?/>??
6. ????</service>??
7. </blueprint>??

?

Java代码

1. //Java??
2. package?org.fusesource.example;??
3. ??
4. public?class?Listener?{??
5. ????public?void?register(Account?service,?java.util.Map?serviceProperties)?{??
6. ????}??
7. ??
8. ????public?void?unregister(Account?service,?java.util.Map?serviceProperties)?{??
9. ????}??
10. }??

???? 说明：register和unregister方法的参数，第一个参数可以是service class或service class 实现的接口，因为该

???? 参数包含service instance,? 如果该service bean 被声明为property, 在注册的时候是没有service instance可用

???? 的，因此此时该参数的值为null.

???? 第二个参数可以是java.util.Map或java.util.Dictionary，这个Map包含service 注册时的Properties.

???? (4) Importing a Service

???? 使用reference和reference-list元素Import Service, 两者之间的区别是：reference用于访问stateless service,

???? 而reference-list用于访问stateful service.

???? 1. Matching by interface (stateless)

Xml代码

1. <blueprint?xmlns="http://www.osgi.org/xmlns/blueprint/v1.0.0">??
2. ????<reference?id="savingsRef"?interface="org.fusesource.example.SavingsAccount"?/>??
3. ????<bean?id="client"?class="org.fusesource.example.client.Client">??
4. ????????<property?name="savingsAccount"?ref="savingsRef"?/>??
5. ????</bean>??
6. </blueprint>??

?

Java代码

1. package?org.fusesource.example.client;??
2. ??
3. import?org.fusesource.example.SavingsAccount;??
4. ??
5. public?class?Client?{??
6. ????SavingsAccount?savingsAccount;??
7. ??
8. ????//?Bean?properties??
9. ????public?SavingsAccount?getSavingsAccount()?{??
10. ????????return?savingsAccount;??
11. ????}??
12. ??
13. ????public?void?setSavingsAccount(SavingsAccount?savingsAccount)?{??
14. ????????this.savingsAccount?=?savingsAccount;??
15. ????}??
16. }??

???? 2.? Matching by interface (stateful)????

Xml代码

1. <blueprint?xmlns="http://www.osgi.org/xmlns/blueprint/v1.0.0">??
2. ????<reference-list?id="savingsListRef"??
3. ????????interface="org.fusesource.example.SavingsAccount"?/>??
4. ????<bean?id="client"?class="org.fusesource.example.client.Client">??
5. ????????<property?name="savingsAccountList"?ref="savingsListRef"?/>??
6. ????</bean>??
7. </blueprint>??

?

Java代码

1. package?org.fusesource.example.client;??
2. ??
3. import?org.fusesource.example.SavingsAccount;??
4. ??
5. public?class?Client?{??
6. ????java.util.List<SavingsAccount>?accountList;??
7. ??
8. ????//?Bean?properties??
9. ????public?java.util.List<SavingsAccount>?getSavingsAccountList()?{??
10. ????????return?accountList;??
11. ????}??
12. ??
13. ????public?void?setSavingsAccountList(java.util.List<SavingsAccount>?accountList)?{??
14. ????????this.accountList?=?accountList;??
15. ????}??
16. }??

???? 3. Matching service properties with a filter

Xml代码

1. <reference?id="savingsRef"?interface="org.fusesource.example.SavingsAccount"?filter="(bank.name=HighStreetBank)"?/>??
2. ??
3. <reference-list?id="savingsRef"?interface="org.fusesource.example.SavingsAccount"?filter="(bank.name=HighStreetBank)"?/>??

???? 4. Specifying whether mandatory or optional

???? 默认值：mandatory

Xml代码

1. <reference?id="savingsRef"?interface="org.fusesource.example.SavingsAccount"?availability="mandatory"?/>??

???? 5. Specifying a reference listener

Xml代码

1. <blueprint?xmlns="http://www.osgi.org/xmlns/blueprint/v1.0.0">??
2. ????<reference?id="savingsRef"?interface="org.fusesource.example.SavingsAccount">??
3. ????????<reference-listener?bind-method="onBind"??
4. ????????????unbind-meth?od="onUnbind">??
5. ????????????<bean?class="org.fusesource.example.client.Listener"?/>??
6. ????????</reference-listener>??
7. ????</reference>??
8. ????<bean?id="client"?class="org.fusesource.example.client.Client">??
9. ????????<property?name="savingsAcc"?ref="savingsRef"?/>??
10. ????</bean>??
11. </blueprint>??

?

Java代码

1. package?org.fusesource.example.client;??
2. ??
3. import?org.osgi.framework.ServiceReference;??
4. ??
5. public?class?Listener?{??
6. ????public?void?onBind(ServiceReference?ref)?{??
7. ????????System.out.println("Bound?service:?"?+?ref);??
8. ????}??
9. ??
10. ????public?void?onUnbind(ServiceReference?ref)?{??
11. ????????System.out.println("Unbound?service:?"?+?ref);??
12. ????}??
13. }?
    

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