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<h2 title="Interface Producer" class="title">Interface Producer</h2>
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<pre>public interface <span class="strong">Producer</span></pre>
<div class="block">Data Producer, a service that can generate values to be used by
<a href="../../../../org/osgi/service/wireadmin/Consumer.html" title="interface in org.osgi.service.wireadmin"><code>Consumer</code></a> services.
<p>
Service objects registered under the Producer interface are expected to
produce values (internally generated or from external sensors). The value can
be of different types. When delivering a value to a <code>Wire</code> object, the
Producer service should coerce the value to be an instance of one of the
types specified by <a href="../../../../org/osgi/service/wireadmin/Wire.html#getFlavors()"><code>Wire.getFlavors()</code></a>. The classes are specified in
order of preference.
<p>
When the data represented by the Producer object changes, this object should
send the updated value by calling the <code>update</code> method on each of
<code>Wire</code> objects passed in the most recent call to this object's
<a href="../../../../org/osgi/service/wireadmin/Producer.html#consumersConnected(org.osgi.service.wireadmin.Wire[])"><code>consumersConnected(Wire[])</code></a> method. These <code>Wire</code> objects will
pass the value on to the associated <code>Consumer</code> service object.
<p>
The Producer service may use the information in the <code>Wire</code> object's
properties to schedule the delivery of values to the <code>Wire</code> object.
<p>
Producer service objects must register with a <code>service.pid</code> and a
<a href="../../../../org/osgi/service/wireadmin/WireConstants.html#WIREADMIN_PRODUCER_FLAVORS"><code>WireConstants.WIREADMIN_PRODUCER_FLAVORS</code></a> property. It is recommended
that a Producer service object also registers with a
<code>service.description</code> property. Producer service objects must register
with a <a href="../../../../org/osgi/service/wireadmin/WireConstants.html#WIREADMIN_PRODUCER_FILTERS"><code>WireConstants.WIREADMIN_PRODUCER_FILTERS</code></a> property if the
Producer service will be performing filtering instead of the <code>Wire</code>
object.
<p>
If an exception is thrown by a Producer object method, a
<code>WireAdminEvent</code> of type <a href="../../../../org/osgi/service/wireadmin/WireAdminEvent.html#PRODUCER_EXCEPTION"><code>WireAdminEvent.PRODUCER_EXCEPTION</code></a> is
broadcast by the Wire Admin service.
<p>
Security Considerations. Data producing bundles will require
<code>ServicePermission[Producer,REGISTER]</code> to register a Producer service.
In general, only the Wire Admin service should have
<code>ServicePermission[Producer,GET]</code>. Thus only the Wire Admin service may
directly call a Producer service. Care must be taken in the sharing of
<code>Wire</code> objects with other bundles.
<p>
Producer services must be registered with scope names when they can send
different types of objects (composite) to the Consumer service. The Producer
service should have <code>WirePermission</code> for each of these scope names.</div>
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<h3>Method Summary</h3>
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<caption><span>Methods</span><span class="tabEnd"> </span></caption>
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<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Method and Description</th>
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<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../../org/osgi/service/wireadmin/Producer.html#consumersConnected(org.osgi.service.wireadmin.Wire[])">consumersConnected</a></strong>(<a href="../../../../org/osgi/service/wireadmin/Wire.html" title="interface in org.osgi.service.wireadmin">Wire</a>[] wires)</code>
<div class="block">Update the list of <code>Wire</code> objects to which this <code>Producer</code>
object is connected.</div>
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<tr class="rowColor">
<td class="colFirst"><code>java.lang.Object</code></td>
<td class="colLast"><code><strong><a href="../../../../org/osgi/service/wireadmin/Producer.html#polled(org.osgi.service.wireadmin.Wire)">polled</a></strong>(<a href="../../../../org/osgi/service/wireadmin/Wire.html" title="interface in org.osgi.service.wireadmin">Wire</a> wire)</code>
<div class="block">Return the current value of this <code>Producer</code> object.</div>
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<h4>polled</h4>
<pre>java.lang.Object polled(<a href="../../../../org/osgi/service/wireadmin/Wire.html" title="interface in org.osgi.service.wireadmin">Wire</a> wire)</pre>
<div class="block">Return the current value of this <code>Producer</code> object.
<p>
This method is called by a <code>Wire</code> object in response to the
Consumer service calling the <code>Wire</code> object's <code>poll</code> method.
The Producer should coerce the value to be an instance of one of the
types specified by <a href="../../../../org/osgi/service/wireadmin/Wire.html#getFlavors()"><code>Wire.getFlavors()</code></a>. The types are specified in
order of of preference. The returned value should be as new or newer than
the last value furnished by this object.
<p>
Note: This method may be called by a <code>Wire</code> object prior to this
object being notified that it is connected to that <code>Wire</code> object
(via the <a href="../../../../org/osgi/service/wireadmin/Producer.html#consumersConnected(org.osgi.service.wireadmin.Wire[])"><code>consumersConnected(Wire[])</code></a> method).
<p>
If the Producer service returns an <code>Envelope</code> object that has an
unpermitted scope name, then the Wire object must ignore (or remove) the
transfer.
<p>
If the <code>Wire</code> object has a scope set, the return value must be an
array of <code>Envelope</code> objects (<code>Envelope[]</code>). The <code>Wire</code>
object must have removed any <code>Envelope</code> objects that have a scope
name that is not in the Wire object's scope.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>wire</code> - The <code>Wire</code> object which is polling this service.</dd>
<dt><span class="strong">Returns:</span></dt><dd>The current value of the Producer service or <code>null</code> if the
value cannot be coerced into a compatible type. Or an array of
<code>Envelope</code> objects.</dd></dl>
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<h4>consumersConnected</h4>
<pre>void consumersConnected(<a href="../../../../org/osgi/service/wireadmin/Wire.html" title="interface in org.osgi.service.wireadmin">Wire</a>[] wires)</pre>
<div class="block">Update the list of <code>Wire</code> objects to which this <code>Producer</code>
object is connected.
<p>
This method is called when the Producer service is first registered and
subsequently whenever a <code>Wire</code> associated with this Producer
becomes connected, is modified or becomes disconnected.
<p>
The Wire Admin service must call this method asynchronously. This implies
that implementors of a Producer service can be assured that the callback
will not take place during registration when they execute the
registration in a synchronized method.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>wires</code> - An array of the current and complete list of <code>Wire</code>
objects to which this Producer service is connected. May be
<code>null</code> if the Producer is not currently connected to any
<code>Wire</code> objects.</dd></dl>
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