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| = OCCI Classes = | | = OCCI Classes = |
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| This is an overview. More complex generated documentation for ''rOCCI-core'' classes is available at [http://rubydoc.info/github/gwdg/rOCCI-core/] | | This page is no longer maintained. See [https://github.com/the-rocci-project/rOCCI-core the-rocci-project/rOCCI-core]. |
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| == Resources ==
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| The basic classes to work with are those extending class <code>Occi::Core::Resource</code>, representing basic cloud resources:
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| * <code>Occi::Infrastructure::Compute</code>
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| * <code>Occi::Infrastructure::Network</code>
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| * <code>Occi::Infrastructure::Storage</code>
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| On instantiation they can be augmented with the following properties. Most of the properties can also be set later along the way:
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| Occi::Core::Resource.new(kind, mixins, attributes, actions, links, location)
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| The easiest way to instantiate a <code>Resource</code> is to call its constructor, for instance for <code>Compute</code>:
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| Occi::Infrastructure::Compute.new
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| It is also possible to call the constructor to the parent <code>Resource</code> class and pass <code>kind</code> as an argument:
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| Occi::Core::Resource.new "http://schemas.ogf.org/occi/infrastructure#compute"
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| which allows your code to be more generic in working with different resource kinds.
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| == Links ==
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| Links—descendants of class <code>Occi::Core::Link</code>—constitute relationships between resource instances. There are, essentially, two kinds of links:
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| * <code>Occi::Infrastructure::Storagelink</code> connecting ''Compute'' with ''Storage'' resources
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| * <code>Occi::Infrastructure::Networkinterface</code> connecting ''Compute'' with ''Network''
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| '''TODO:''' ''How to instantiate a link''
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| == Mixins ==
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| Mixins extend the functionality of vanilla classes. Currently the following mixin templates are available:
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| * <code>Occi::Infrastructure::Resource_tpl.mixin</code>
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| * <code>Occi::Infrastructure::Os_tpl.mixin</code>
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| '''TODO:''' ''Short note on purpose for each mixin template above. Possibly also list other planned mixins, if any.''
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| Mixin templates can be applied to classes on instantiation. A minimalistic example to instantiate an (otherwise empty) <code>Compute</code> class and add a mixin with template <code>Os_tpl</code> could be put together as follows:
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| Occi::Core::Resource.new("http://schemas.ogf.org/occi/infrastructure#compute", [Occi::Infrastructure::Os_tpl.mixin], {}, [], [], nil)
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| The mixin can also be applied to an existing instance with the following:
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| comp=Occi::Infrastructure::Compute.new
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| comp.mixins << Occi::Infrastructure::Os_tpl.mixin
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| == Actions ==
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| Actions (instances of class <code>Occi::Core::Action</code>) are operations (to be) performed with respect to resource objects. Different actions are supported for different kinds of resources. The following actions are defined:
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| * '''<code>Compute</code>'''
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| ** <code>start, stop, restart, suspend</code>
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| * '''<code>Storage</code>'''
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| ** <code>online, offline, backup, snapshot, resize</code>
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| * '''<code>Network</code>'''
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| ** <code>up, down</code>
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| * '''<code>Storagelink</code>'''
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| ** <code>online, offline</code>
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| * '''<code>Networkinterface</code>'''
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| ** <code>up, down</code>
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| Actions are governed by attributes specific to each action. For instance the <code>restart</code> action is controlled with:
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| restart.attributes['method'] = {:mutable => true,
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| :pattern => 'graceful|warm|cold',
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| :default => 'cold'}
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| '''TODO:''' Rendering
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| '''TODO:''' Make this section say something meaningful.
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| == Rendering ==
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| ''rOCCI-core'' classes provide methods for rendering their contents into messages in various supported formats. Essentially there are the following methods:
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| * <code>to_text()</code> to produce a plain-text rendering of the object
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| * <code>to_header()</code> to produce a [http://rubygems.org/gems/hashie <code>Hashie::Mash</code>] holding the rendering of the object as an HTTP header
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| * <code>to_json()</code> to produce a string holding the rendering of the object in the JSON format
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| * <code>as_json()</code> to produce a [http://rubygems.org/gems/hashie <code>Hashie::Mash</code>] holding the rendering of the object in the JSON format
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| For instance, a <code>Compute</code> resource can be easily instantiated and then rendered in JSON as a [http://rubygems.org/gems/hashie <code>Hashie::Mash</code>] by calling:
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| res = Occi::Infrastructure::Compute.new
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| res.as_json
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| Similarly, an <code>Action</code>, for instance, can be rendered in an HTTP header by calling:
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| act =
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| act.to_header
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| '''TODO:''' finish the instantiation of the action
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| ''Note: While there is support for [[Rocci-Core-Parts#ovfova-files|parsing OVF/OVA files]], the reverse operation, i.e. OVF/OVA rendering, is not supported.''
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| '''TODO:''' Confirm the above is correct
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| = Parser =
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| The parser processes input in various formats and produces ''rOCCI-core'' collections.
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| == OCCI Messages ==
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| The <code>Occi::Parser</code> supports the following content types for OCCI-compliant messages:
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| * <code>text/plain</code> (HTTP body)
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| * <code>text/occi</code> (HTTP headers)
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| * <code>application/occi+json</code>
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| * <code>application/xml</code>
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| The parsing operation is carried out by the <code>parse()</code> method whose attributes are as follows:
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| Occi::Parser.parse(media_type, body, category, entity_type, header)
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| For instance, let us have a message of type <code>text/plain</code>:
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| compute_text_plain = %Q|Category: compute;scheme="http://schemas.ogf.org/occi/infrastructure#";class="kind" Category: compute;scheme="http://opennebula.org/occi/infrastructure#";class="mixin" X-OCCI-Attribute: occi.core.id="0953b280-28ac-5d77-abe7-5fb67118c01c" X-OCCI-Attribute: occi.core.title="one-33064" X-OCCI-Attribute: occi.compute.cores=1 X-OCCI-Attribute: occi.compute.memory=0.256 X-OCCI-Attribute: occi.compute.architecture="x86" X-OCCI-Attribute: occi.compute.speed=1 X-OCCI-Attribute: occi.compute.state="active" X-OCCI-Attribute: org.opennebula.compute.cpu=1.0 Link: </storage/e60aa2b8-0c86-5973-b93e-30c5c46d6eac>;rel="http://schemas.ogf.org/occi/infrastructure#storage";self="/storagelink/b2f7f1de-c60c-5b08-879c-81f52429c4ef";category="http://schemas.ogf.org/occi/infrastructure#storagelink";occi.core.id="b2f7f1de-c60c-5b08-879c-81f52429c4ef" occi.core.title="monitoring" occi.storagelink.deviceid="xvda" occi.storagelink.state="inactive" org.opennebula.storagelink.bus="ide" org.opennebula.storagelink.driver="tap2:tapdisk:aio:" Link: </network/e4bd81c4-adda-5626-840d-39bb7959db97>;rel="http://schemas.ogf.org/occi/infrastructure#network";self="/networkinterface/e75ab249-9325-511c-82b8-a7e4430381e3";category="http://schemas.ogf.org/occi/infrastructure#networkinterface";occi.core.id="e75ab249-9325-511c-82b8-a7e4430381e3" occi.core.title="monitoring" occi.networkinterface.address="192.168.254.18" occi.networkinterface.mac="02:00:c0:a8:fe:12" occi.networkinterface.state="inactive" org.opennebula.networkinterface.bridge="xenbr0"|
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| That can be parsed by calling:
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| Occi::Parser.parse('text/plain', compute_text_plain, false, Occi::Core::Resource, {})
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| … returning a collection of <code>Resource</code> objects (in this case holding one object).
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| = Logger =
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| ''rOCCI-core'' provides its own logging facility. To initiate logging, one needs to initialize a logger (<code>Occi::Log</code>) instance with the desired output file (either a regular file or an I/O object such as <code>STDOUT</code> or <code>STDERR</code>) and the logging level. The following levels are recognized in an ascending order of severity:
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| # <code>Occi::Log::DEBUG</code>
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| # <code>Occi::Log::INFO</code>
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| # <code>Occi::Log::WARN</code>
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| # <code>Occi::Log::ERROR</code>
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| # <code>Occi::Log::FATAL</code>
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| For instance, the following sequence initializes a logger to output messages with level <code>ERROR</code> or higher to <code>STDERR</code>:
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| logger = Occi::Log.new STDERR
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| logger.level=Occi::Log::ERROR
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| … while the next one initializes another instance of <code>Occi::Log</code> to write highly verbose debugging output to a regular file:
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| debuglog = Occi::Log.new "/tmp/rOCCI_debug.log"
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| debuglog.level=Occi::Log::DEBUG
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| = Model =
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| An OCCI model reflects the capabilities of a given resource manager. It is used for local discovery and validation of desired actions.
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| In normal conditions, an instance of <code>Occi::Model</code> is created by querying an actual resource provider and parsing its response. For testing, an instance of a model can be set up manually. Note that in real life the contents of <code>mod_response</code> would be passed by the remote side.
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| mod_response = "Category: entity;scheme=\"http://schemas.ogf.org/occi/core#\";class=\"kind\";title=\"Entity\";location=\"/entity/\";attributes=\"occi.core.id occi.core.title\"\nCategory: resource;scheme=\"http://schemas.ogf.org/occi/core#\";class=\"kind\";title=\"Resource\";rel=\"http://schemas.ogf.org/occi/core#entity\";location=\"/resource/\";attributes=\"occi.core.summary\"\nCategory: link;scheme=\"http://schemas.ogf.org/occi/core#\";class=\"kind\";title=\"Link\";rel=\"http://schemas.ogf.org/occi/core#entity\";location=\"/link/\";attributes=\"occi.core.target occi.core.source\"\nCategory: compute;scheme=\"http://schemas.ogf.org/occi/infrastructure#\";class=\"kind\";title=\"Compute Resource\";rel=\"http://schemas.ogf.org/occi/core#resource\";location=\"/compute/\";attributes=\"occi.compute.architecture occi.compute.cores occi.compute.hostname occi.compute.speed occi.compute.memory occi.compute.state\";actions=\"http://schemas.ogf.org/occi/infrastructure/compute/action#start http://schemas.ogf.org/occi/infrastructure/compute/action#stop http://schemas.ogf.org/occi/infrastructure/compute/action#restart http://schemas.ogf.org/occi/infrastructure/compute/action#suspend\"\nCategory: storagelink;scheme=\"http://schemas.ogf.org/occi/infrastructure#\";class=\"kind\";title=\"Storage Link\";rel=\"http://schemas.ogf.org/occi/core#link\";location=\"/storagelink/\";attributes=\"occi.storagelink.deviceid occi.storagelink.mountpoint occi.storagelink.state\"\nCategory: network;scheme=\"http://schemas.ogf.org/occi/infrastructure#\";class=\"kind\";title=\"Network Resource\";rel=\"http://schemas.ogf.org/occi/core#resource\";location=\"/network/\";attributes=\"occi.network.vlan occi.network.label occi.network.state\";actions=\"http://schemas.ogf.org/occi/infrastructure/network/action#up http://schemas.ogf.org/occi/infrastructure/network/action#down\"\nCategory: storage;scheme=\"http://schemas.ogf.org/occi/infrastructure#\";class=\"kind\";title=\"Storage Resource\";rel=\"http://schemas.ogf.org/occi/core#resource\";location=\"/storage/\";attributes=\"occi.storage.size occi.storage.state\";actions=\"http://schemas.ogf.org/occi/infrastructure/storage/action#online http://schemas.ogf.org/occi/infrastructure/storage/action#offline http://schemas.ogf.org/occi/infrastructure/storage/action#backup http://schemas.ogf.org/occi/infrastructure/storage/action#snapshot http://schemas.ogf.org/occi/infrastructure/storage/action#resize\"\nCategory: networkinterface;scheme=\"http://schemas.ogf.org/occi/infrastructure#\";class=\"kind\";title=\"Networkinterface\";rel=\"http://schemas.ogf.org/occi/core#link\";location=\"/networkinterface/\";attributes=\"occi.networkinterface.interface occi.networkinterface.mac occi.networkinterface.state\"\nCategory: console;scheme=\"http://schemas.ogf.org/occi/infrastructure/compute#\";class=\"kind\";title=\"Link to the VM's console\";rel=\"http://schemas.ogf.org/occi/core#link\";location=\"/console/\"\nCategory: os_tpl;scheme=\"http://schemas.ogf.org/occi/infrastructure#\";class=\"mixin\";title=\"Operating System Template\";location=\"/mixins/os_tpl/\"\nCategory: ipnetwork;scheme=\"http://schemas.ogf.org/occi/infrastructure/network#\";class=\"mixin\";title=\"IP Network Mixin\";location=\"/mixins/ipnetwork/\";attributes=\"occi.network.address occi.network.gateway occi.network.allocation occi.network.state\"\nCategory: ipnetworkinterface;scheme=\"http://schemas.ogf.org/occi/infrastructure/networkinterface#\";class=\"mixin\";title=\"IP Networkinterface Mixin\";location=\"/mixins/ipnetworkinterface/\";attributes=\"occi.networkinterface.address occi.networkinterface.gateway occi.networkinterface.allocation occi.networkinterface.state\"\nCategory: resource_tpl;scheme=\"http://schemas.ogf.org/occi/infrastructure#\";class=\"mixin\";title=\"Resource Template\";location=\"/mixins/resource_tpl/\"\nCategory: compute;scheme=\"http://opennebula.org/occi/infrastructure#\";class=\"mixin\";title=\"OpenNebula specific Compute attributes\";location=\"/mixins/compute/\";attributes=\"org.opennebula.compute.cpu org.opennebula.compute.kernel org.opennebula.compute.initrd org.opennebula.compute.root org.opennebula.compute.kernel_cmd org.opennebula.compute.bootloader org.opennebula.compute.boot\"\nCategory: storagelink;scheme=\"http://opennebula.org/occi/infrastructure#\";class=\"mixin\";title=\"OpenNebula specific Storagelink attributes\";location=\"/mixins/storagelink/\";attributes=\"org.opennebula.storagelink.bus org.opennebula.storagelink.driver\"\nCategory: network;scheme=\"http://opennebula.org/occi/infrastructure#\";class=\"mixin\";title=\"OpenNebula specific Network attributes\";location=\"/mixins/network/\";attributes=\"org.opennebula.network.id org.opennebula.network.bridge org.opennebula.network.vlan org.opennebula.network.phydev org.opennebula.network.ip_start org.opennebula.network.ip_end\"\nCategory: storage;scheme=\"http://opennebula.org/occi/infrastructure#\";class=\"mixin\";title=\"OpenNebula specific Storage attributes\";location=\"/mixins/storage/\";attributes=\"org.opennebula.storage\"\nCategory: networkinterface;scheme=\"http://opennebula.org/occi/infrastructure#\";class=\"mixin\";title=\"OpenNebula specific Networkinterface attributes\";location=\"/mixins/networkinterface/\";attributes=\"org.opennebula.networkinterface.bridge org.opennebula.networkinterface.script org.opennebula.networkinterface.model org.opennebula.networkinterface.white_ports_tcp org.opennebula.networkinterface.black_ports_tcp org.opennebula.networkinterface.white_ports_udp org.opennebula.networkinterface.black_ports_udp org.opennebula.networkinterface.icmp\"\nCategory: large;scheme=\"https://occi.localhost/occi/infrastructure/resource_tpl#\";class=\"mixin\";title=\"Large Instance - 2 cores and 7.5 GB of RAM\";rel=\"http://schemas.ogf.org/occi/infrastructure#resource_tpl\";location=\"/mixins/large/\";attributes=\"occi.compute.architecture occi.compute.cores occi.compute.speed occi.compute.memory\"\nCategory: extra_large;scheme=\"https://occi.localhost/occi/infrastructure/resource_tpl#\";class=\"mixin\";title=\"Extra Large Instance - 4 cores and 15 GB of RAM\";rel=\"http://schemas.ogf.org/occi/infrastructure#resource_tpl\";location=\"/mixins/extra_large/\";attributes=\"occi.compute.architecture occi.compute.cores occi.compute.speed occi.compute.memory\"\nCategory: larger;scheme=\"https://occi.localhost/occi/infrastructure/resource_tpl#\";class=\"mixin\";title=\"Larger Instance - 4 cores and 10 GB of RAM\";rel=\"http://schemas.ogf.org/occi/infrastructure#resource_tpl\";location=\"/mixins/larger/\";attributes=\"occi.compute.architecture occi.compute.cores occi.compute.speed occi.compute.memory\"\nCategory: medium;scheme=\"https://occi.localhost/occi/infrastructure/resource_tpl#\";class=\"mixin\";title=\"Medium Instance - 2 cores and 3.75 GB of RAM\";rel=\"http://schemas.ogf.org/occi/infrastructure#resource_tpl\";location=\"/mixins/medium/\";attributes=\"occi.compute.architecture occi.compute.cores occi.compute.speed occi.compute.memory\"\nCategory: small;scheme=\"https://occi.localhost/occi/infrastructure/resource_tpl#\";class=\"mixin\";title=\"Small Instance - 1 core and 1.7 GB of RAM\";rel=\"http://schemas.ogf.org/occi/infrastructure#resource_tpl\";location=\"/mixins/small/\";attributes=\"occi.compute.architecture occi.compute.cores occi.compute.speed occi.compute.memory\"\nCategory: monitoring;scheme=\"https://occi.localhost/occi/infrastructure/os_tpl#\";class=\"mixin\";title=\"monitoring\";rel=\"http://schemas.ogf.org/occi/infrastructure#os_tpl\";location=\"/mixins/monitoring/\"\nCategory: debianvm;scheme=\"https://occi.localhost/occi/infrastructure/os_tpl#\";class=\"mixin\";title=\"debianvm\";rel=\"http://schemas.ogf.org/occi/infrastructure#os_tpl\";location=\"/mixins/debianvm/\"\nCategory: egicf2012_demo;scheme=\"https://occi.localhost/occi/infrastructure/os_tpl#\";class=\"mixin\";title=\"egicf2012-demo\";rel=\"http://schemas.ogf.org/occi/infrastructure#os_tpl\";location=\"/mixins/egicf2012_demo/\"\nCategory: oxfordcorpusserver;scheme=\"https://occi.localhost/occi/infrastructure/os_tpl#\";class=\"mixin\";title=\"OxfordCorpusServer\";rel=\"http://schemas.ogf.org/occi/infrastructure#os_tpl\";location=\"/mixins/oxfordcorpusserver/\"\nCategory: omserver;scheme=\"https://occi.localhost/occi/infrastructure/os_tpl#\";class=\"mixin\";title=\"OMServer\";rel=\"http://schemas.ogf.org/occi/infrastructure#os_tpl\";location=\"/mixins/omserver/\"\nCategory: wenmr_demo_rp;scheme=\"https://occi.localhost/occi/infrastructure/os_tpl#\";class=\"mixin\";title=\"WeNMR-Demo-CESNET\";rel=\"http://schemas.ogf.org/occi/infrastructure#os_tpl\";location=\"/mixins/wenmr_demo_rp/\"\nCategory: egi_sl6goldenimage_rp;scheme=\"https://occi.localhost/occi/infrastructure/os_tpl#\";class=\"mixin\";title=\"EGI-SL6GoldenImage-CESNET\";rel=\"http://schemas.ogf.org/occi/infrastructure#os_tpl\";location=\"/mixins/egi_sl6goldenimage_rp/\"\nCategory: hadoop;scheme=\"https://occi.localhost/occi/infrastructure/os_tpl#\";class=\"mixin\";title=\"hadoop\";rel=\"http://schemas.ogf.org/occi/infrastructure#os_tpl\";location=\"/mixins/hadoop/\"\nCategory: clever_unime;scheme=\"https://occi.localhost/occi/infrastructure/os_tpl#\";class=\"mixin\";title=\"clever-unime\";rel=\"http://schemas.ogf.org/occi/infrastructure#os_tpl\";location=\"/mixins/clever_unime/\"\nCategory: generic_vm;scheme=\"https://occi.localhost/occi/infrastructure/os_tpl#\";class=\"mixin\";title=\"generic_vm\";rel=\"http://schemas.ogf.org/occi/infrastructure#os_tpl\";location=\"/mixins/generic_vm/\"\nCategory: octave;scheme=\"https://occi.localhost/occi/infrastructure/os_tpl#\";class=\"mixin\";title=\"octave\";rel=\"http://schemas.ogf.org/occi/infrastructure#os_tpl\";location=\"/mixins/octave/\"\nCategory: r;scheme=\"https://occi.localhost/occi/infrastructure/os_tpl#\";class=\"mixin\";title=\"r\";rel=\"http://schemas.ogf.org/occi/infrastructure#os_tpl\";location=\"/mixins/r/\"\nCategory: egi_compss_rp;scheme=\"https://occi.localhost/occi/infrastructure/os_tpl#\";class=\"mixin\";title=\"EGI-COMPSs-CESNET\";rel=\"http://schemas.ogf.org/occi/infrastructure#os_tpl\";location=\"/mixins/egi_compss_rp/\"\nCategory: esa_sl64_rp;scheme=\"https://occi.localhost/occi/infrastructure/os_tpl#\";class=\"mixin\";title=\"ESA-SL64-CESNET\";rel=\"http://schemas.ogf.org/occi/infrastructure#os_tpl\";location=\"/mixins/esa_sl64_rp/\"\nCategory: generic_www;scheme=\"https://occi.localhost/occi/infrastructure/os_tpl#\";class=\"mixin\";title=\"generic_www\";rel=\"http://schemas.ogf.org/occi/infrastructure#os_tpl\";location=\"/mixins/generic_www/\"\nCategory: egi_compss;scheme=\"https://occi.localhost/occi/infrastructure/os_tpl#\";class=\"mixin\";title=\"EGI-COMPSs\";rel=\"http://schemas.ogf.org/occi/infrastructure#os_tpl\";location=\"/mixins/egi_compss/\"\nCategory: biovel_nfs;scheme=\"https://occi.localhost/occi/infrastructure/os_tpl#\";class=\"mixin\";title=\"biovel_nfs\";rel=\"http://schemas.ogf.org/occi/infrastructure#os_tpl\";location=\"/mixins/biovel_nfs/\"\nCategory: start;scheme=\"http://schemas.ogf.org/occi/infrastructure/compute/action#\";class=\"action\";title=\"Start Compute instance\"\nCategory: stop;scheme=\"http://schemas.ogf.org/occi/infrastructure/compute/action#\";class=\"action\";title=\"Stop Compute instance\";attributes=\"method\"\nCategory: restart;scheme=\"http://schemas.ogf.org/occi/infrastructure/compute/action#\";class=\"action\";title=\"Restart Compute instance\";attributes=\"method\"\nCategory: suspend;scheme=\"http://schemas.ogf.org/occi/infrastructure/compute/action#\";class=\"action\";title=\"Suspend Compute instance\";attributes=\"method\"\nCategory: up;scheme=\"http://schemas.ogf.org/occi/infrastructure/network/action#\";class=\"action\";title=\"Activate network\"\nCategory: down;scheme=\"http://schemas.ogf.org/occi/infrastructure/network/action#up\";class=\"action\";title=\"Activate network\"\nCategory: online;scheme=\"http://schemas.ogf.org/occi/infrastructure/storage/action#\";class=\"action\";title=\"Activate Storage\"\nCategory: offline;scheme=\"http://schemas.ogf.org/occi/infrastructure/storage/action#\";class=\"action\";title=\"Deactivate Storage\"\nCategory: backup;scheme=\"http://schemas.ogf.org/occi/infrastructure/storage/action#\";class=\"action\";title=\"Backup Storage\"\nCategory: snapshot;scheme=\"http://schemas.ogf.org/occi/infrastructure/storage/action#\";class=\"action\";title=\"Snapshot Storage\"\nCategory: resize;scheme=\"http://schemas.ogf.org/occi/infrastructure/storage/action#\";class=\"action\";title=\"Resize Storage\";attributes=\"size\""
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| collection = Occi::Parser.parse 'text/plain', mod_response, true
| |
| model = Occi::Model.new(collection)
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| Then, for instance, to list categories specific to <code>compute</code>:
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| model.get_by_id "http://schemas.ogf.org/occi/infrastructure#compute"
| |
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| = Configuration =
| |
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| The behavior of ''rOCCI-core'' is governed in some respect – namely where a code change introduced a possibility of backward-incompatible behavior – by the contents of the configuration file <code>occi.yml</code>
| |
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