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Dependency Injector for PHP5
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Wires is a PHP 5 library for handling dependency injection. Wires currently does constructor injection only. To learn all about inversion of control and dependency injection, have a look here: http://martinfowler.com/articles/injection.html ABOUT ~~~~~ Wires contains two main classes, the Injector and the Locator. The Locator is responsible for defining what classes or objects should be instantiated where and the Injector is responsible for building the objects. The two work in concert to let you define dependencies and instantiate object graphs based on those definitions. Dependency definitions consist of a context, which is a class or interface name, and a list of bindings. These bindings define how to instantiate the constructor parameters of an object in that context. The contexts are hierarchical, so a binding defined in the context of an interface will apply to all objects that implement that interface and similarly with abstract and base classes. There is also a global context that applies to all objects, but the most specific context will always win out. There are four different ways in which dependencies can be defined in the Locator: * Binding an interface or abstract class to a concrete class. This method works with type-hinted parameters. If the concrete class has it's own dependencies, they will be filled in as well and so on down the hierarchy * Binding an interface or abstract class to a singleton. Like the previous option, this one works with type-hinted parameters. It will instantiate a single instance of the concrete class to use for every parameter of the abstract type in the context * Binding a parameter name to a class. This will instantiate a new object of the class and assign it to that parameter. If that object has it's own dependencies, they will be filled in also and so on down the tree * Binding a value to a parameter. This is a way to assign a value to a parameter by name. It can be any value including primitives USAGE ~~~~~ The easiest way to create an instance of the Injector is to use the static method in the Wires class. $injector = Wires::getInjector($bindings); Here, $bindings is an array of binding definitions as described above. The structure of this array will be explained in the next section. After creating the injector, you can then instantiate a class using the create() method. You can pass to the create() method the name of a concrete class or an interface or abstract class that has a concrete implementation defined in the given context. $object = $injector->create('MyClassInterface'); A common usage pattern is to have an array of bindings that are always defined for an application, but occasionally need to add additional bindings or overwrite ones that are already defined. In this case you can use the with() method. $object2 = $injector->with($other_bindings)->create('MyClassInterface'); BINDING DEFINITIONS ~~~~~~~~~~~~~~~~~~~ The structure of the $bindings array is a multi-level associative array. The first level is the name of the context. This can be an interface name, class name or the global context which is named "_global". Under each context is another associative array where the keys are either a type-hint or a parameter name. Here are some examples of each of the four definition types. * Type Hinted array( '_global' => array( 'MyClassInterface' => 'MyConcreteClass')); * Type Hinted to Singleton array( 'OtherContext' => array( 'MyClassInterface' => array('asSingleton' => true, 'class' => 'MyConcreteClass'))); * Parameter Name to Class array( '_global' => array( 'param' => array('class' => 'MyConcreteClass'))); * Parameter Name to Value array( 'OtherContext' => array( 'param2' => array('value' => 1234))); * All together array( '_global' => array( 'MyClassInterface' => 'MyConcreteClass', 'param' => array('class' => 'MyConcreteClass')), 'OtherContext' => array( 'MyClassInterface' => array('asSingleton' => true, 'class' => 'MyConcreteClass'), 'param2' => array('value' => 1234))); EXAMPLES ~~~~~~~~ See the included examples in the docs/examples directory. LINKS ~~~~~ GitHub: http://github.com/spiralout/Wires LICENSE ~~~~~~~ Copyright (c) 2010 Sean Crystal All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: * Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. * The name of the author not may be used to endorse or promote products derived from this software without specific prior written permission. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.