blocks|key|559195|text|我不认为谷歌会提供任何简单的方法来解决这个问题。您必须使用模块服务，并将其包装到您的助手类，如LinkFactory，使用getLinkToA(String)和getLinkToB(String)等方法，并在任何地方创建到模块的链接。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|559196|同样的(更大的)问题是如果您使用调度文件。这实际上是更大的问题，因为您的前端应用程序的部分可能会失败，因为路由不工作在开发服务器。|559197|entityMap|0|LINK|mutability|MUTABLE|url|https://developers.google.com/appengine/docs/java/modules/#Java_Communication_between_modules|1|https://developers.google.com/appengine/docs/java/modules/routing#dispatch_file^0|1B|B|1P|I|28|I|T|4|0|0|G|4|1|0^^$0|@$1|2|3|4|5|6|7|R|8|@$9|S|A|T|B|C]|$9|U|A|V|B|C]|$9|W|A|X|B|C]]|D|@$9|Y|A|Z|1|10]]|E|$]]|$1|F|3|G|5|6|7|11|8|@]|D|@$9|12|A|13|1|14]]|E|$]]|$1|H|3|-4|5|6|7|15|8|@]|D|@]|E|$]]]|I|$J|$5|K|L|M|E|$N|O]]|P|$5|K|L|M|E|$N|Q]]]]

I don't think Google will provide any easy approach to this problem. You'll have to use <a href="https://developers.google.com/appengine/docs/java/modules/#Java_Communication_between_modules" rel="nofollow">the modules service</a> and wrap it to your helper class such as <code>LinkFactory</code> with methods like <code>getLinkToA(String)</code> and <code>getLinkToB(String)</code> and you them everywhere you're creating the links to the modules.

Same (and bigger) problem is if you use <a href="https://developers.google.com/appengine/docs/java/modules/routing#dispatch_file" rel="nofollow">the dispatch file</a>. This is actually bigger problem, because parts of your front end app may failed since the routing is not working in the development server.

blocks|key|3043724|text|虽然模块服务在这个场景中可能很有用，而且我相信它会起作用，但我以一种稍微不同的方式解决了这个问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|3043725|我修改了构建脚本，以便在localhost上运行所有模块，但是在不同的端口上运行(实际上有几个本地appengine实例正在运行)。配置信息(IP:PORT)存储在配置文件中，任何模块都很容易访问。对于部署，我仍然将应用程序打包到ear存档中。|3043726|entityMap|0|LINK|mutability|MUTABLE|url|https://developers.google.com/appengine/docs/java/modules/#Java_Communication_between_modules^0|2|4|0|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@$A|O|B|P|1|Q]]|C|$]]|$1|D|3|E|5|6|7|R|8|@]|9|@]|C|$]]|$1|F|3|-4|5|6|7|S|8|@]|9|@]|C|$]]]|G|$H|$5|I|J|K|C|$L|M]]]]

Although the <a href="https://developers.google.com/appengine/docs/java/modules/#Java_Communication_between_modules" rel="nofollow">modules service</a> could be useful in this scenario, and I believe it would work, I solve the problem in a bit different way.

I modified my build script to run all the modules on localhost, but on different port (essentially there are a few local appengine instances running). The configuration information (IP:PORT) is stored in a configuration file and is easily accessible to any module. For the deployment I still package the application into an ear archive.

blocks|key|1963803|text|可以使用JVM参数设置每个模块的端口。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1963804|-Dcom.google.appengine.devappserver_module.{module_name}.port=8081|code-block|syntax|javascript|1963805|我使用appengine+plugin进行以下配置(我的定制模块称为“分析”)：|1963806|<plugin>
+++<groupId>com.google.appengine</groupId>
+++<artifactId>appengine-maven-plugin</artifactId>
+++<configuration>
++++++<jvmFlags>
+++++++++<jvmFlag>-Ddatastore.backing_store=${project.basedir}/target/local_db.bin</jvmFlag>
+++++++++<jvmFlag>-Xdebug</jvmFlag>
+++++++++<jvmFlag>-Dcom.google.appengine.devappserver_module.analysis.port=8081</jvmFlag>
+++++++++<jvmFlag>-XX:MaxPermSize=512m</jvmFlag>
+++++++++<jvmFlag>-agentlib:jdwp=transport=dt_socket,address=8001,server=y,suspend=n</jvmFlag>
++++++</jvmFlags>
++++++<enhancerApi>JPA</enhancerApi>
++++++<fullScanSeconds>2</fullScanSeconds>
+++</configuration>
</plugin>|1963807|当我运行mvn+appengine:devserver时，与该模块对应的日志如下所示：|1963808|[INFO]+INFO:+Started+SelectChannelConnector@127.0.0.1:8081
[INFO]+Jun+10,+2014+10:44:16+AM+com.google.appengine.tools.development.JettyContainerService+startHotDeployScanner
[INFO]+INFO:+Full+scan+of+the+web+app+in+place+every+2s.
[INFO]+Jun+10,+2014+10:44:16+AM+com.google.appengine.tools.development.AbstractModule+startup
[INFO]+INFO:+Module+instance+analysis+is+running+at+http://localhost:8081/
[INFO]+Jun+10,+2014+10:44:16+AM+com.google.appengine.tools.development.AbstractModule+startup
[INFO]+INFO:+The+admin+console+is+running+at+http://localhost:8081/_ah/admin
[INFO]+Jun+10,+2014+11:44:16+AM+com.google.appengine.tools.development.DevAppServerImpl+doStart
[INFO]+INFO:+Dev+App+Server+is+now+running|1963809|希望能帮上忙。|1963810|entityMap^0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|U|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|W|8|@]|9|@]|A|$]]|$1|M|3|N|5|D|7|X|8|@]|9|@]|A|$E|F]]|$1|O|3|P|5|6|7|Y|8|@]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|R|$]]

It is possible to set the port of each module using JVM parameters.

<pre><code>-Dcom.google.appengine.devappserver_module.{module_name}.port=8081
</code></pre>

I use the appengine-maven-plugin with the following configuration (my bespoke module is called "analysis"):

<pre><code>&lt;plugin&gt;
 &lt;groupId&gt;com.google.appengine&lt;/groupId&gt;
 &lt;artifactId&gt;appengine-maven-plugin&lt;/artifactId&gt;
 &lt;configuration&gt;
 &lt;jvmFlags&gt;
 &lt;jvmFlag&gt;-Ddatastore.backing_store=${project.basedir}/target/local_db.bin&lt;/jvmFlag&gt;
 &lt;jvmFlag&gt;-Xdebug&lt;/jvmFlag&gt;
 &lt;jvmFlag&gt;-Dcom.google.appengine.devappserver_module.analysis.port=8081&lt;/jvmFlag&gt;
 &lt;jvmFlag&gt;-XX:MaxPermSize=512m&lt;/jvmFlag&gt;
 &lt;jvmFlag&gt;-agentlib:jdwp=transport=dt_socket,address=8001,server=y,suspend=n&lt;/jvmFlag&gt;
 &lt;/jvmFlags&gt;
 &lt;enhancerApi&gt;JPA&lt;/enhancerApi&gt;
 &lt;fullScanSeconds&gt;2&lt;/fullScanSeconds&gt;
 &lt;/configuration&gt;
&lt;/plugin&gt;
</code></pre>

When I run the mvn appengine:devserver then the logs corresponding to that module are like this:

<pre><code>[INFO] INFO: Started SelectChannelConnector@127.0.0.1:8081
[INFO] Jun 10, 2014 10:44:16 AM com.google.appengine.tools.development.JettyContainerService startHotDeployScanner
[INFO] INFO: Full scan of the web app in place every 2s.
[INFO] Jun 10, 2014 10:44:16 AM com.google.appengine.tools.development.AbstractModule startup
[INFO] INFO: Module instance analysis is running at http://localhost:8081/
[INFO] Jun 10, 2014 10:44:16 AM com.google.appengine.tools.development.AbstractModule startup
[INFO] INFO: The admin console is running at http://localhost:8081/_ah/admin
[INFO] Jun 10, 2014 11:44:16 AM com.google.appengine.tools.development.DevAppServerImpl doStart
[INFO] INFO: Dev App Server is now running
</code></pre>

I hope it helped.

blocks|key|3043777|text|您可以通过模块的appengine-web.xml文件中的系统属性设置模块的端口。例如：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|3043778|<appengine-web-app+xmlns="http://appengine.google.com/ns/1.0">
++++<module>MY_MODULE</module>
++++<version>v1</version>
++++<threadsafe>true</threadsafe>
++++<system-properties>
++++++++<property+name="com.google.appengine.devappserver_module.MY_MODULE.port"
++++++++++++value="8081"/>
++++</system-properties>
</appengine-web-app>|code-block|syntax|javascript|3043779|entityMap^0|8|H|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|P|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|L|$]]

You can set a module's port via a system property in the module's <code>appengine-web.xml</code> file. For example:

<pre><code>&lt;appengine-web-app xmlns="http://appengine.google.com/ns/1.0"&gt;
 &lt;module&gt;MY_MODULE&lt;/module&gt;
 &lt;version&gt;v1&lt;/version&gt;
 &lt;threadsafe&gt;true&lt;/threadsafe&gt;
 &lt;system-properties&gt;
 &lt;property name="com.google.appengine.devappserver_module.MY_MODULE.port"
 value="8081"/&gt;
 &lt;/system-properties&gt;
&lt;/appengine-web-app&gt;
</code></pre>

I'm using multiple modules with Google AppEngine and was wondering if its possible to run development server (java version) so that ports that are assigned to different modules are always the same? At the moment they seem to be random. Can I decide on those ports? I would like to be able to establish communication with between modules in a sustainable way (from the development perspective). At the moment if we have two modules, let's call them A and B, and we would like to consume services exposed by module A in module B there's no easy way to know which URL to hit from module B.

GAE modules on development server

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我在Google AppEngine中使用多个模块，并想知道是否有可能运行开发服务器(java版本)，以便分配给不同模块的端口总是相同的？目前他们似乎是随机的。我能决定那些港口吗？我希望能够以可持续的方式(从发展的角度)与模块之间建立沟通。现在，如果我们有两个模块，让我们将它们称为A和B，我们希望使用模块B中由模块A公...

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