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Merge pull request #71 from epics-base/pvaClientMultiChannel_changes

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Pva client multi channel changes
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Marty Kraimer
2021-03-06 09:18:52 -05:00
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commit 2d6f0f1821
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This document summarizes the changes to the module between releases.
## Release 4.8.0 (EPICS 7.0.4.* March 2021
* PvaClientNTMultiData::getChannelChangeFlags is a new method. It fixes issue #66.
* Fix for issue #68. Both PvaClientArray and PvaClientField are not longer present. Neither was previously implemented.
* Several public methods are now protected. They were never meant to be called by clients.
* Issue #70 has been fixed.
* Changes was made to increase the performance of pvaMultiChannel.
* doxygen changes were made.
## Release 4.7.1 (EPICS 7.0.3.2 May 2020)
* support access to a union field that is a scalar or scalarArray

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NOT FOR DIRECT USE
==================
This directory holds files that are used by doxygen.
The files are not meant to be read except via the doxygen documention.

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<?xml version="1.0" encoding="iso-8859-1"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="content-type" content="text/html; charset=iso-8859-1" />
<title>PvaClient</title>
<link rel="stylesheet" type="text/css"
href="http://epics-pvdata.sourceforge.net/base.css" />
<link rel="stylesheet" type="text/css"
href="http://epics-pvdata.sourceforge.net/epicsv4.css" />
<style type="text/css">
/*<![CDATA[*/
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/*]]>*/</style>
<!-- Script that generates the Table of Contents -->
<script type="text/javascript"
src="http://epics-pvdata.sourceforge.net/script/tocgen.js">
</script>
</head>
<body>
<h1>PvaClient</h1>
<h2>Overview</h2>
<p>
pvaClient is a synchronous wrapper for the pvAccess API, which is a callback based API.
Thus it is easier to use than pvAccess itself.
In addition pvaClient provides many convenience methods.
</p>
<p>
Class <b>PvaClient</b> is a class that is used by all the other pvaClient classes.
An application that uses pvaClient must call:</p>
<pre>
PvaClientPtr pvaClient = PvaClient::get(providers);
</pre>
<p>
before it uses any other pvaClient classes.
</p>
<p>
This is a singleton method, i. e. only one instance of PvaClient is created.
</p>
<p>
<b>pvaClient</b> must not be deleted until the client no longer wants to use any part
of pvaClient.
</p>
<p>
<b>providers</b> is a blank separated set of provider names.
For example:</p>
<pre>
PvaClientPtr pvaClient = PvaClient::get("ca pva");
</pre>
<p>
The providers <b>ca</b> and <b>pva</b> are special.
For each of these a client context is created when the <b>PvaClient</b>
is constructed and the context destroyed when <b>PvaClient</b> is deleted.
</p>
<h2>Channel Caching</h2>
<p>
<b>PvaClient</b> has a method:
</p>
<pre>
PvaClientChannelPtr channel(
string const &amp; channelName,
string const &amp;providerName = "pva",
double timeOut = 5.0);
</pre>
<p>
This method creates a
<b>PvaClientChannel</b> and then connects to the channel.
</p>
<p>
If a call is successful then multiple calls to the same channelName and providerName
share the same PvaClientChannel, i. e. the PvaClientChannel is cached.
</p>
<p>
<b>pvaClientChannelGet</b> and <b>pvaClientChannelPut</b> also implement caching.
</p>
<p>
For example consider a client that makes multiple calls like:
</p>
<pre>
double value;
value = pva->channel(channelName)->get()->getData()->getDouble();
...
value = pva->channel(channelName)->get()->getData()->getDouble();
</pre>
<p>
Only the first call creates a new PvaClientChannel and a new PvaClientGet.
The second call reuses the cached PvaClientChannel and PvaClientGet.
</p>
<h2>Non Cached Channels</h2>
<p>
<b>PvaClient</b> has a method:
</p>
<pre>
PvaClientChannelPtr createChannel(
string const &amp; channelName,
string const &amp;providerName = "pva");
</pre>
<p>
This method is just creates a new PvaClientChannel and returns it to the caller.
The caller must call the PvaClientChannel connect methods.
</p>
<h2>Blocking vs Non-Blocking Methods</h2>
<p>Each component of pvaClient provides a set of blocking and non-blocking calls.
For example several components (examples are <b>PvaClientChannel</b> and <b>PvaChannelGet</b>)
have methods:</p>
<dl>
<dt>connect</dt>
<dd>
This calls issueConnect and then waitConnect.
If waitConnect fails an exception is thrown.
Since waitConnect is a blocking method so is this.
</dd>
<dt>issueConnect</dt>
<dd>
This is a request to connect, i. e. issue a request to the server to create something
on the server. This is a non blocking call.
</dd>
<dt>waitConnect</dt>
<dd>
This waits for the server to respond to issueConnect.
It blocks until the server responds or a timeout occurs.
</dd>
</dl>
</body>
</html>

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<?xml version="1.0" encoding="iso-8859-1"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="content-type" content="text/html; charset=iso-8859-1" />
<title>PvaClientChannel</title>
<link rel="stylesheet" type="text/css"
href="http://epics-pvdata.sourceforge.net/base.css" />
<link rel="stylesheet" type="text/css"
href="http://epics-pvdata.sourceforge.net/epicsv4.css" />
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<body>
<h1>PvaClientChannel</h1>
<h2>Overview</h2>
<p>
pvaClientChannel is a synchronous wrapper for the pvAccess::Channel API, which is a callback based API.
Thus it is easier to use than pvAccess::Channel itself.
</p>
<p>An instance of <b>PvaClientChannel</b> connects to a single channel.
An instance can only be created via class <b>PvaClient</b> which has both synchronous methods, which block, and non blocking methods.
The synchrouous methods block until a connection is made to the channel and throw an exception if a
timeout occurs while trying to make a connection.
The non blocking methods leave connection to the caller.
</p>
<p><b>PvaClientChannel</b> has methods:</p>
<dl>
<dt>Connect to channel</dt>
<dd>These can be called indirectly by a blocking request to <b>PvaClient</b>
or by the client if a non blocking request is made to <b>PvaClient</b>.
</dd>
<dt>Channel state change requester</dt>
<dd>The client can provide a callback that is called each time the connection state
of the channel changes.
</dd>
<dt>Creating all of the following</dt>
<dd>
<pre>
PvaClientField NOT IMPLEMENTED
PvaClientProcess
PvaClientGet
PvaClientPut
PvaClientPutGet
PvaClientMonitor
PvaClientArray NOT IMPLEMENTED
PvaClientRPC
</pre>
</dd>
</dl>
<h2>Connect: Blocking vs Non-Blocking </h2>
<p><b>PvaClientChannel</b> has methods:</p>
<dl>
<dt>connect</dt>
<dd>
This calls issueConnect and then waitConnect.
If waitConnect fails an exception is thrown.
Since waitConnect is a blocking method so is this.
</dd>
<dt>issueConnect</dt>
<dd>
This is a request to connect to the channel. This is a non blocking call.
</dd>
<dt>waitConnect</dt>
<dd>
This waits for the server to respond to issueConnect.
It blocks until the server responds or a timeout occurs.
</dd>
</dl>
<h2>Get and Put Caching</h2>
<p>
<b>PvaClientChannel</b> has methods:
</p>
<pre>
PvaClientGetPtr get(std::string const &amp; request);
PvaClientPutPtr put(std::string const &amp; request);
</pre>
<p>
Each of these caches.
For example all calls to <b>get</b> with the same <b>request</b> will share the same
<b>PvaChannelGet</b>
</p>
<p>
For example consider a client that makes multiple calls like:
</p>
<pre>
double value;
value = pva->channel(channelName)->get()->getData()->getDouble();
...
value = pva->channel(channelName)->get()->getData()->getDouble();
</pre>
<p>
Only the first call creates a new PvaClientChannel and a new PvaClientGet.
The second call reuses the cached PvaClientChannel and PvaClientGet.
</p>
</body>
</html>

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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="content-type" content="text/html; charset=iso-8859-1" />
<title>PvaClientChannelStateChangeRequester</title>
<link rel="stylesheet" type="text/css"
href="http://epics-pvdata.sourceforge.net/base.css" />
<link rel="stylesheet" type="text/css"
href="http://epics-pvdata.sourceforge.net/epicsv4.css" />
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<body>
<h1>PvaClientChannelStateChangeRequester</h1>
<p>This class has the single method <b>channelStateChange</b>.
It is called each time the channel connection status changes.
</p>
<p>
<b>NOTE:</b>
The implementation must not call a method that blocks waiting for a response from the server.
It it does the client may be blocked forever.
</p>
<p>
An example of illegal code is:
</p>
<pre>
virtual void channelStateChange(PvaClientChannelPtr const & channel, bool isConnected)
{
if(isConnected&&!pvaClientPut)
{
pvaClientPut = pvaClientChannel->createPut(request);
pvaClientPut->connect();
}
}
</pre>
<p>
This is illegal because the call to <b>connect</b> blocks.
</p>
<p>The following is an example of legal code:
</p>
<pre>
virtual void channelStateChange(PvaClientChannelPtr const & channel, bool isConnected)
{
if(isConnected&&!pvaClientPut)
{
pvaClientPut = pvaClientChannel->createPut(request);
pvaClientPut->issueConnect();
}
}
</pre>
<p>This is legal code because neither <b>createPut</b> or <b>issueConnect</b>
blocks.
</p>
</body>
</html>

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<?xml version="1.0" encoding="iso-8859-1"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="content-type" content="text/html; charset=iso-8859-1" />
<title>PvaClientGet</title>
<link rel="stylesheet" type="text/css"
href="http://epics-pvdata.sourceforge.net/base.css" />
<link rel="stylesheet" type="text/css"
href="http://epics-pvdata.sourceforge.net/epicsv4.css" />
<style type="text/css">
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src="http://epics-pvdata.sourceforge.net/script/tocgen.js">
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</head>
<body>
<h1>PvaClientGet</h1>
<p>
pvaClientGet is a synchronous wrapper for the pvAccess::ChannelGet API, which is a callback based API.
Thus it is easier to use than pvAccess::ChannelGet itself.
</p>
<p>An instance of PvaClientGet is created via a call to one of the following:</p>
<pre>
class PvaClientChannel
...
{
...
PvaClientGetPtr get(std::string const &amp; request = "field(value,alarm,timeStamp)");
PvaClientGetPtr createGet(std::string const &amp; request = "");
PvaClientGetPtr createGet(epics::pvData::PVStructurePtr const &amp; pvRequest);
...
};
<p>An instance of <b>PvaClientGet</b> connects to a single channel.
<b>PvaClientGet</b> has both synchronous methods, which block, and non blocking methods.
</p>
<p><b>PvaClientChannel</b> has methods:</p>
<pre>
connect Calls issueConnect and then waitConnect.
issueConnect issues a request to the server to create the server side of ChannelPut.
waitConnect blocks until server responds that it has created the ChannelPut.
get Calls issueGet and then waitGet.
issueGet issues a get request to the server.
waitGet waits until the server send a message that the get is complete.
getData get the data.
</pre>
<p>
<b>issueConnect</b> and <b>issueGet</b> do not block.
All other methods can block.
</p>
</body>
</html>

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<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="content-type" content="text/html; charset=iso-8859-1" />
<title>PvaClientGetData</title>
<link rel="stylesheet" type="text/css"
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<link rel="stylesheet" type="text/css"
href="http://epics-pvdata.sourceforge.net/epicsv4.css" />
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</script>
</head>
<body>
<h1>PvaClientGetData</h1>
<p>This class provides access to the data returned by calls to get data via <b>PvaChannelGet</b>
It provides methods:</p>
<pre>
getStructure Get the introspection interface for data returned from server
getPVStructure Get the complete set of data returned from the server.
getChangedBitSet Get the bitSet that shows which fields have a new value since last get.
showChanged Show all the fields that have changed value since the last get,
getAlarm If a alarm field is available get it.
getTimeStamp If a timeStamp field is available get it.
hasValue Does the PVStructure have a top level field named value
NOTE: The following only apply if hasValue is true.
isValueScalar Is the value field a scalar?
isValueScalarArray Is the value field a scalar array?
getValue Get the value field.
getScalarValue Get a scalar value field.
getArrayValue Get an array value field.
getScalarArrayValue Get a scalar array value field.
getDouble Get scalar value field as a double.
getString Get value field as a string.
getDoubleArray Get value field as a double array.
getStringArray Get value field as a string array.
</pre>
</body>
</html>

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<?xml version="1.0" encoding="iso-8859-1"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="content-type" content="text/html; charset=iso-8859-1" />
<title>PvaClientGetRequester</title>
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<link rel="stylesheet" type="text/css"
href="http://epics-pvdata.sourceforge.net/epicsv4.css" />
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<body>
<h1>PvaClientGetRequester</h1>
<p>This is a virtual class that can be implemented by a client that uses <b>PvaClientGet</b>.
It has the methods:</p>
<pre>
virtual void channelGetConnect(
const Status&amp; status,
PvaClientGetPtr const &amp; clientGet) {}
virtual void getDone(
const Status&amp; status,
PvaClientGetPtr const &amp; clientGet) = 0;
</pre>
<p>The client must call</p>
<pre>
pvaClientGet->setRequester(shared_from_this());
</pre>
<p>
after creating an instance of PvaClientGet.
</p>
</body>
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<body>
<h1>PvaClientMonitor</h1>
<p>
<b>NOTE:</b> This is a work in progress.
</p>
<h2>Overview</h2>
<p>
This provides an easier way to create a monitor on a channel than to use pvAccessCPP itself.
It provides two main ways to create a monitor:
</p>
<h3>The client first creates a PvaClientMonitorChannel and then creates a monitor</h3>
The client calls:
<pre>
static PvaClientMonitorPtr create(
PvaClientMonitorPtr const &amp;PvaClientMonitor,
PvaClientMonitorChannelPtr const &amp; PvaClientMonitorChannel,
epics::pvData::PVStructurePtr const &amp;pvRequest
);
where
PvaClientMonitor
The PvaClientMonitor.
PvaClientMonitorChannel
The PvaClientMonitorChannel that has already been created by the client.
pvRequest
The pvRequest for creating the monitor.
</pre>
With this method the monitor is created and started.
This method blocks while the monitor is created.
<h3>The client provides names for a channel and a provider</h3>
The client calls:
<pre>
static PvaClientMonitorPtr create(
PvaClientMonitorPtr const &amp;PvaClientMonitor,
std::string const &amp; channelName,
std::string const &amp; providerName,
std::string const &amp; request,
PvaClientMonitorChannelStateChangeRequesterPtr const &amp; stateChangeRequester,
PvaClientMonitorRequesterPtr const &amp; monitorRequester
);
where
PvaClientMonitor
The PvaClientMonitor.
channelName
The name of the channel.
providerName
The name of the provider
request
The request for creating the monitor
stateChangeRequester
The client supplied state change requester.
This will be called each time a state change for the channel occurs.
monitorRequester
The client supplied monitor requester.
This is called each time a new monitor event is available.
</pre>
With this method a pvaChannel is created and after it connects a pvaMonitor is created and started.
This method never blocks.
</body>
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<h1>PvaClientMonitorData</h1>
<p>This class provides access to the data returned by calls to get data via <b>PvaChannelGet</b>
It provides methods:</p>
<pre>
getStructure Get the introspection interface for data returned from server
getPVStructure Get the complete set of data returned from the server.
getChangedBitSet Get the bitSet that shows which fields have a new value since last monitor event.
getOverrunBitSet Get the bitSet that shows which fields have changed more than once since last monitor event.
showChanged Show all the fields that have changed value since the last monitor event,
showChanged Show all the fields that have changed value more than once since last monitor event.
getAlarm If a alarm field is available get it.
getTimeStamp If a timeStamp field is available get it.
hasValue Does the PVStructure have a top level field named value
NOTE: The following only apply if hasValue is true.
isValueScalar Is the value field a scalar?
isValueScalarArray Is the value field a scalar array?
getValue Get the value field.
getScalarValue Get a scalar value field.
getArrayValue Get an array value field.
getScalarArrayValue Get a scalar array value field.
getDouble Get scalar value field as a double.
getString Get value field as a string.
getDoubleArray Get value field as a double array.
getStringArray Get value field as a string array.
</pre>
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<h1>PvaClientMonitorRequester</h1>
<p>This is a virtual class that can be implemented by a client that uses <b>PvaClientMonitor</b>.
It has the methods:</p>
<pre>
virtual void monitorConnect(
const Status&amp; status,
PvaClientMonitorPtr const &amp; clientMonitor,
StructureConstPtr const &amp; structure) {}
virtual void event(
PvaClientMonitor const &amp; clientGet) = 0;
virtual void unlisten()
{
std::cerr &lt;&lt; "PvaClientMonitorRequester::unlisten called"
&lt;&lt; " but no PvaClientMonitorRequester::unlisten\n";
}
</pre>
<p>The client must call</p>
<pre>
pvaClientMonitor->setRequester(shared_from_this());
</pre>
<p>
after creating an instance of PvaClientMonitor.
</p>
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<h1>PvaClientProcess</h1>
<p>
pvaClientProcess is a synchronous wrapper for the pvAccess::ChannelProcess API, which is a callback based API.
Thus it is easier to use than pvAccess::ChannelProcess itself.
</p>
<p>An instance of PvaClientProcess is created via a call to one of the followimg:</p>
<pre>
class PvaClientChannel
...
{
...
PvaClientProcessPtr createProcess(std::string const &amp; request = "");
PvaClientProcessPtr createProcess(epics::pvData::PVStructurePtr const &amp; pvRequest);
...
};
<p>An instance of <b>PvaClientProcess</b> connects to a single channel.
<b>PvaClientProcess</b> has both synchronous methods, which block, and non blocking methods.
</p>
<p><b>PvaClientChannel</b> has methods:</p>
<pre>
connect Calls issueConnect and then waitConnect.
issueConnect issues a request to the server to create the server side of ChannelPut.
waitConnect blocks until server responds that it has created the ChannelPut.
process Calls issueProcess and then waitProcess.
issueProcess issues a process request to the server.
waitProcess waits until the server send a message that the process is complete.
</pre>
<p>
<b>issueConnect</b> and <b>issueProcess</b> do not block.
All other methods can block.
</p>
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<h1>PvaClientChannelPut</h1>s
<p>
pvaClientPut is a synchronous wrapper for the pvAccess::ChannelPut API, which is a callback based API.
Thus it is easier to use than pvAccess::ChannelPut itself.
</p>
<p>
<b>NOTE:</b>
Except for union fields pvaClientPut takes care of modifying the bitSet associated with
the data sent to the server.
</p>
<p>An instance of PvaClientPut is created via a call to one of the followimg:</p>
<pre>
class PvaClientChannel
...
{
...
PvaClientPutPtr put(std::string const & request = "field(value,alarm,timeStamp)");
PvaClientPutPtr createPut(std::string const & request = "");
PvaClientPutPtr createPut(epics::pvData::PVStructurePtr const & pvRequest);
...
};
<p>An instance of <b>PvaClientPut/b> connects to a single channel.
<b>PvaClientPut</b> has both synchronous methods, which block, and non blocking methods.
</p>
<p><b>PvaClientPut</b> has methods:</p>
<pre>
connect Calls issueConnect and then waitConnect.
issueConnect issues a request to the server to create the server side of ChannelPut.
waitConnect blocks until server responds that it has created the ChannelPut.
get Calls issueGet and then waitGet.
issueGet issues a request to the server to get the latest data.
waitGet waits until the server send a message that the get is complete.
put Calls issuePut and then waitPut.
issuePut issues a put request to the server.
waitPut waits until the server send a message that the put is complete.
getData get the data.
</pre>
<p>
Note that <b>issueConnect</b>, <b>issueGet</b> and <b>issuePut</b> do not block but all other methods
do block.
</p>
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<h1>PvaClientPutData</h1>
<p>This class provides access to data to send to the server via a <b>PvaChannelPut</b>
It is created by <b>PvaChannelPut</b> or <b>PvaChannelPutGet</b>.
This the client only gets access to an instance by getting it from <b>PvaChannelPut</b> or <b>PvaChannelPutGet</b>.
<p>
<p>Note also that for all field types except <b>union</b> the <b>BitSet</b> for the data is updated
by <b>PvaChannelPut</b> or <b>PvaChannelPutGet</b> whenever the client changes a field.
For a <b>union</b> or <b>unionArray</b> field the client must update the <b>BitSet</b>.
</p>
<p>
PvaClientPutData provides methods:</p>
<pre>
getStructure Get the introspection interface for data sent to server
getPVStructure Get the complete set of data sent to the server.
getChangedBitSet Get the bitSet that shows which fields have a new value since last get.
showChanged Show all the fields that have changed value since the last get,
getAlarm If a alarm field is available get it.
getTimeStamp If a timeStamp field is available get it.
hasValue Does the PVStructure have a top level field named value
NOTE: The following only apply if hasValue is true.
isValueScalar Is the value field a scalar?
isValueScalarArray Is the value field a scalar array?
getValue Get the value field.
getScalarValue Get a scalar value field.
getArrayValue Get an array value field.
getScalarArrayValue Get a scalar array value field.
getDouble Get scalar value field as a double.
getString Get value field as a string.
getDoubleArray Get value field as a double array.
getStringArray Get value field as a string array.
putDouble Put scalar value field as a double.
putString Put value field as a string.
putDoubleArray Put value field as a double array.
putStringArray Put value field as a string array.
</pre>
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<h1>PvaClientPutGetGet</h1>
<p>
pvaClientPutGet is a synchronous wrapper for the pvAccess::ChannelPutGet API, which is a callback based API.
Thus it is easier to use than pvAccess::ChannelPut itself.
</p>
<p>
<b>NOTE:</b>
Except for union fields pvaClientPutGet takes care of modifying the bitSet associated with
the data sent to the server.
</p>
<p>An instance of PvaClientPutGet is created via a call to one of the followimg:</p>
<pre>
class PvaClientChannel
...
{
...
PvaClientPutGetPtr createPutGet(std::string const &amp; request);
PvaClientPutGetPtr createPutGet(epics::pvData::PVStructurePtr const &amp; pvRequest);
...
};
<p>An instance of <b>PvaClientPutGet</b> connects to a single channel.
<b>PvaClientPutGet</b> has both synchronous methods, which block, and non blocking methods.
</p>
<p><b>PvaClientPutGet</b> has methods:</p>
<pre>
connect calls issueConnect and then waitConnect.
issueConnect issues a request to the server to create the server side of ChannelPut.
waitConnect blocks until server responds that it has created the ChannelPut.
putGet call issuePutGet and then waitPutGet.
issuePutGet issue a putGet and return immediately.
waitPutGet wait until putGet completes.
getGet calls issueGetGet and then waitGetGet.
issueGetGet issues a request to the server to get the latest data for the get data.
waitGetGet waits until the server send a message that the getGet is complete.
getPut calls issueGetPut and then waitGetPut.
issueGetPut issues a request to the server to get the latest data for the put data.
waitGetPut waits until the server send a message that the getPut is complete.
getPutData get the put portion of the data.
getGetData get the get portion of the data.
</pre>
<p>
<b>issueConnect</b>, <b>issuePutGet</b>, <b>issueGetGet</b> and <b>issueGetPut</b> do not block.
All other methods can block.
</p>
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<h1>PvaClientPutGetRequester</h1>
<p>This is a virtual class that can be implemented by a client that uses <b>PvaClientPut</b>.
It has the methods:</p>
<pre>
virtual void channelPutGetConnect(
const Status&amp; status,
PvaClientPutGetPtr const &amp; clientPutGet) {}
virtual void putGetDone(
const Status&amp; status,
PvaClientPutGetPtr const &amp; clientPutGet) {}
virtual void getPutDone(
const Status&amp; status,
PvaClientPutGetPtr const &amp; clientPutGet) = 0;
virtual void getGetDone(
const Status&amp; status,
PvaClientPutGetPtr const &amp; clientPutGet) = 0;
</pre>
<p>The client must call</p>
<pre>
pvaClientPutGet->setRequester(shared_from_this());
</pre>
<p>
after creating an instance of PvaClientPutGet.
</p>
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<h1>PvaClientPutRequester</h1>
<p>This is a virtual class that can be implemented by a client that uses <b>PvaClientPut</b>.
It has the methods:</p>
<pre>
virtual void channelPutConnect(
const Status&amp; status,
PvaClientPutPtr const &amp; clientPut) {}
virtual void getDone(
const Status&amp; status,
PvaClientPutPtr const &amp; clientPut) {}
virtual void putDone(
const Status&amp; status,
PvaClientPutPtr const &amp; clientPut) = 0;
</pre>
<p>The client must call</p>
<pre>
pvaClientPut->setRequester(shared_from_this());
</pre>
<p>
after creating an instance of PvaClientPut.
</p>
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<h1>PvaClientRPC</h1>
<p>
<b>Not Yet Written</b>
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<h1>PvaClientRPCRequester</h1>
<p>
<b>Not Yet Written</b>
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<div class="head">
<h1>EPICS pvaClientCPP</h1>
<h2 class="nocount">Release 4.4 - April 2019</h2>
<h2 class="nocount">Release 4.8 - March 2021</h2>
<h2 class="nocount">Abstract</h2>
@@ -66,9 +66,16 @@ The data for the channels is presented via normative type NTMultiChannel.
<hr />
<h2>Overview</h2>
<p>
Documentation for pvaClientCPP is available at:
<a
href="https://mrkraimer.github.io/website/developerGuide/pvaClient/pvaClientCPP.html">
pvaClient
</a>
</p>
<p>
pvaClientCPP is one of the components of
<a href="http://epics-pvdata.sourceforge.net">
EPICS Version 4
<a href="https://epics-controls.org/resources-and-support/base/epics-7/">
EPICS-7
</a>
</p>
<p>This document is only a guide to help locate code and documentation related to pvaClientCPP