<apex:page > 
    <h1>Appointment Table</h1> 
    
    <apex:pageBlock title="Select a doctor">
        <apex:pageBlockSection title="doctor">
        </apex:pageBlockSection>
    </apex:pageBlock>
     <apex:pageBlock title="Working Hours Start    ">
    </apex:pageBlock>
    <apex:pageBlock title="Working Hours Ends    ">
    </apex:pageBlock>
     <apex:pageBlock title="Select a patient">
        <apex:pageBlockSection title="patient">
        </apex:pageBlockSection>
    </apex:pageBlock>
</apex:page>

I have my own Salesforce consulting practice, based in the general New York area of the US.  We do a lot of work with a Salesforce application that is designed for law firms and legal offices.  If you are interested in working with me on various on-going Salesforce projects, please contact me directly at donal@dpmtechnology.com

Hi all,

We need to implement the following pattern at my org:

• callout to external data source
• if that callout takes too long (according to some configurable threshold), log an error (ie do some DML)
• if that callout timed out on the remote server, try it again

Recognizing the potential for the dreaded "You have uncommitted work pending. Please commit or rollback before calling out." error, I put the error logging code in a future method, thus isolating the DML from the callouts. However, the error is still being thrown. I reduced the issue down to this pattern:

public static void foo() {
    Http http = new Http();
    HttpRequest req = new Httprequest();
    req.setEndpoint('https://test.salesforce.com'); //whatever endpoint
    req.setMethod('GET');
    http.send(req); //works fine
    bar();
    http.send(req); //throws calloutexception
}

@future public static void bar() {

}

Am I correct to assume that calling a future method counts as a DML operation? Is there any documentation I'm missing somewhere?