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Have a look at<br>
<a class="moz-txt-link-freetext" href="https://github.com/google/guice/wiki/Multibindings">https://github.com/google/guice/wiki/Multibindings</a><br>
<br>
this does not solve the problem of how to configure them. But it
allows you to inject a set/map of things.<br>
<br>
<br>
<div class="moz-cite-prefix">On 11/07/2016 11:42 PM, Dominik wrote:<br>
</div>
<blockquote
cite="mid:dc7b7e5c-9019-408e-b883-***@googlegroups.com"
type="cite">
<div dir="ltr">I want to inject a sequence of components where
each component implements the same interface. Each of the
components may have dependencies themselves which may vary
amongst the different implementations of the interface. The
actual sequence shall be configurable by the user by means of a
configuration file or any mechanism that is made available
through the dependency injection framework (guice).<br>
<br>
To be more concrete I'll give an example:<br>
<code><br>
</code>
<div style="background-color: rgb(250, 250, 250); border-color:
rgb(187, 187, 187); border-style: solid; border-width: 1px;
overflow-wrap: break-word;" class="prettyprint"><code
class="prettyprint">
<div class="subprettyprint"><code><span style="color: #008;"
class="styled-by-prettify">interface</span><span
style="color: #000;" class="styled-by-prettify"> </span><span
style="color: #606;" class="styled-by-prettify">Machine</span><span
style="color: #000;" class="styled-by-prettify"> </span><span
style="color: #660;" class="styled-by-prettify">{...}</span><span
style="color: #000;" class="styled-by-prettify"><br>
<br>
</span><span style="color: #008;"
class="styled-by-prettify">class</span><span
style="color: #000;" class="styled-by-prettify"> </span><span
style="color: #606;" class="styled-by-prettify">Dishwasher</span><span
style="color: #000;" class="styled-by-prettify"> </span><span
style="color: #008;" class="styled-by-prettify">implements</span><span
style="color: #000;" class="styled-by-prettify"> </span><span
style="color: #606;" class="styled-by-prettify">Machine</span><span
style="color: #000;" class="styled-by-prettify"> </span><span
style="color: #660;" class="styled-by-prettify">{</span><span
style="color: #000;" class="styled-by-prettify"><br>
</span><span style="color: #800;"
class="styled-by-prettify">// Here some dependencies
should be injected.</span><span style="color: #000;"
class="styled-by-prettify"><br>
</span><span style="color: #660;"
class="styled-by-prettify">}</span><span style="color:
#000;" class="styled-by-prettify"><br>
</span><span style="color: #008;"
class="styled-by-prettify">class</span><span
style="color: #000;" class="styled-by-prettify"> </span><span
style="color: #606;" class="styled-by-prettify">VacuumCleaner</span><span
style="color: #000;" class="styled-by-prettify"> </span><span
style="color: #008;" class="styled-by-prettify">implements</span><span
style="color: #000;" class="styled-by-prettify"> </span><span
style="color: #606;" class="styled-by-prettify">Machine</span><span
style="color: #000;" class="styled-by-prettify"> </span><span
style="color: #660;" class="styled-by-prettify">{</span><span
style="color: #000;" class="styled-by-prettify"><br>
</span><span style="color: #000;"
class="styled-by-prettify"></span></code><code><span
style="color: #000;" class="styled-by-prettify"><code
class="prettyprint"><code><span style="color: #000;"
class="styled-by-prettify"> </span><span
style="color: #800;" class="styled-by-prettify">//
Here some dependencies should be injected.</span><span
style="color: #000;" class="styled-by-prettify"><br>
</span></code></code></span><span style="color:
#660;" class="styled-by-prettify">}</span><span
style="color: #000;" class="styled-by-prettify"><br>
<br>
</span><span style="color: #008;"
class="styled-by-prettify">class</span><span
style="color: #000;" class="styled-by-prettify"> </span><span
style="color: #606;" class="styled-by-prettify">Household</span><span
style="color: #000;" class="styled-by-prettify"> </span><span
style="color: #660;" class="styled-by-prettify">{</span><span
style="color: #000;" class="styled-by-prettify"><br>
</span><span style="color: #800;"
class="styled-by-prettify">// Here I want to inject a
sequence of `Machine`s.</span><span style="color:
#000;" class="styled-by-prettify"><br>
</span><span style="color: #660;"
class="styled-by-prettify">}</span><span style="color:
#000;" class="styled-by-prettify"><br>
<br>
</span><span style="color: #800;"
class="styled-by-prettify">// Now the user may specify
in whatever way which machines are present in the
household,</span><span style="color: #000;"
class="styled-by-prettify"><br>
</span><span style="color: #800;"
class="styled-by-prettify">// and this setting is not
changing during runtime.</span><span style="color:
#000;" class="styled-by-prettify"><br>
// For example (using an arbitrary notation):<br>
//<br>
</span></code><code><span style="color: #000;"
class="styled-by-prettify"><code class="prettyprint"><code><span
style="color: #000;" class="styled-by-prettify">//</span></code></code>
Household<br>
</span></code><code><span style="color: #000;"
class="styled-by-prettify"><code class="prettyprint"><code><span
style="color: #000;" class="styled-by-prettify">//</span></code></code>
|<br>
</span></code><code><span style="color: #000;"
class="styled-by-prettify"><code class="prettyprint"><code><span
style="color: #000;" class="styled-by-prettify">//</span></code></code>
|---- Machines<br>
</span></code><code><span style="color: #000;"
class="styled-by-prettify"><code class="prettyprint"><code><span
style="color: #000;" class="styled-by-prettify">//</span></code></code>
|<br>
</span></code><code><span style="color: #000;"
class="styled-by-prettify"><code class="prettyprint"><code><span
style="color: #000;" class="styled-by-prettify">//</span></code></code>
|---- Dishwasher<br>
</span></code><code><span style="color: #000;"
class="styled-by-prettify"><code class="prettyprint"><code><span
style="color: #000;" class="styled-by-prettify">//</span></code></code>
| |<br>
</span></code><code><span style="color: #000;"
class="styled-by-prettify"><code class="prettyprint"><code><span
style="color: #000;" class="styled-by-prettify">//</span></code></code>
| |----- SomeDepedencyForDishwasher</span></code><br>
<code><span style="color: #000;"
class="styled-by-prettify"><code class="prettyprint"><code><span
style="color: #000;" class="styled-by-prettify"><code
class="prettyprint"><code><span style="color:
#000;" class="styled-by-prettify">//</span></code></code>
| |----- AnotherDepedencyForDishwasher</span></code></code><br>
</span></code><code><span style="color: #000;"
class="styled-by-prettify"><code class="prettyprint"><code><span
style="color: #000;" class="styled-by-prettify">//</span></code></code>
|<br>
</span></code><code><span style="color: #000;"
class="styled-by-prettify"><code class="prettyprint"><code><span
style="color: #000;" class="styled-by-prettify">//</span></code></code>
|----- VacuumCleaner</span></code><br>
<code><span style="color: #000;"
class="styled-by-prettify"><code class="prettyprint"><code><span
style="color: #000;" class="styled-by-prettify"><code
class="prettyprint"><code><span style="color:
#000;" class="styled-by-prettify">//</span></code></code>
| |<br>
</span></code></code></span></code><code><span
style="color: #000;" class="styled-by-prettify"><code
class="prettyprint"><code><span style="color: #000;"
class="styled-by-prettify"><code
class="prettyprint"><code><span style="color:
#000;" class="styled-by-prettify">//</span></code></code>
| |----- SomeDependencyForVacuumCleaner</span></code><code><span
style="color: #000;" class="styled-by-prettify"><br>
</span></code></code></span></code><code><span
style="color: #000;" class="styled-by-prettify"><code
class="prettyprint"><code><span style="color: #000;"
class="styled-by-prettify"><code
class="prettyprint"><code><span style="color:
#000;" class="styled-by-prettify">//</span></code></code>
|</span></code></code></span></code><br>
<code><span style="color: #000;"
class="styled-by-prettify"><code class="prettyprint"><code><span
style="color: #000;" class="styled-by-prettify"><code
class="prettyprint"><code><span style="color:
#000;" class="styled-by-prettify">//</span></code></code>
|----- VacuumCleaner</span></code><br>
<code><span style="color: #000;"
class="styled-by-prettify"><code
class="prettyprint"><code><span style="color:
#000;" class="styled-by-prettify"></span></code></code></span></code></code></span></code><code><span
style="color: #000;" class="styled-by-prettify"><code
class="prettyprint"><code><span style="color: #000;"
class="styled-by-prettify"><code
class="prettyprint"><code><span style="color:
#000;" class="styled-by-prettify"><code
class="prettyprint"><code><span
style="color: #000;"
class="styled-by-prettify">//</span></code></code>
| |<br>
</span></code></code></span></code></code></span></code><code><span
style="color: #000;" class="styled-by-prettify"><code
class="prettyprint"><code><span style="color: #000;"
class="styled-by-prettify"><code
class="prettyprint"><code><span style="color:
#000;" class="styled-by-prettify"><code
class="prettyprint"><code><span
style="color: #000;"
class="styled-by-prettify">//</span></code></code>
| |-----
AnotherDependencyForVacuumCleaner</span></code><code><span
style="color: #000;"
class="styled-by-prettify"><br>
</span></code></code></span></code></code></span></code><code
class="prettyprint"><code><span style="color: #000;"
class="styled-by-prettify">//</span></code></code><br>
<code><span style="color: #000;"
class="styled-by-prettify"><code class="prettyprint"><code><span
style="color: #000;" class="styled-by-prettify">//</span></code></code><br>
// So the household would have three `Machine`s, two
of which are `VacuumCleaner`s<br>
// (where each `VacuumCleaner` itself depends on a
different implementation of another interface)<br>
// and one `Dishwasher`.<br>
</span></code></div>
</code></div>
<br>
How can I realize this using guice? I could write a custom
provider for the `Machine`s (i.e. a `MachineFactory`), however
the pattern that "a component depends on a sequence of others
with dependencies themselves" may repeat further down the chain,
so I would be forced to write providers/factories for all of
them. This somehow breaks the purpose of dependency injection
where I can request a component and all dependencies are
resolved automatically by the framework. Furthermore it requires
the factory to have knowledge about the possible dependencies of
all implementations of the interface which breaks the separation
of dependencies from the application: whenever I add a new
implementation (a new Machine, e.g. `WashingMaschine`) I need to
check whether the factory already requests all required
dependencies for the `WashingMaschine` in order to "inject" them
manually into the `WashingMaschine` later on. If a new
dependency is introduced I need to fix the factory accordingly.<br>
<br>
Any ideas? Thanks! Cheers, Dominik<br>
</div>
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</blockquote>
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