Use the operator's value to update custom fields

[zhaoyawei]

import com.atlassian.jira.component.ComponentAccessor
import com.atlassian.jira.event.issue.IssueEvent
import com.atlassian.jira.event.type.EventDispatchOption
import com.atlassian.jira.issue.CustomFieldManager
import com.atlassian.jira.issue.IssueManager
import com.atlassian.jira.issue.MutableIssue
import com.atlassian.jira.issue.watchers.WatcherManager
import com.atlassian.jira.user.ApplicationUser

def jiraAuth = ComponentAccessor.getJiraAuthenticationContext();
def thisUser = jiraAuth.getUser();
def issue = event.getIssue();

IssueManager issueManager = ComponentAccessor.getIssueManager();
WatcherManager watcherManager = ComponentAccessor.getWatcherManager();
CustomFieldManager customFieldManager = ComponentAccessor.getCustomFieldManager();
MutableIssue mutableIssue = issueManager.getIssueObject(issue.getkey())
Collection<ApplicationUser> appList = [];
issue.getAssigneeUser().directoryUser
issue.getExternalFieldValue(issue.getAssigneeId())
def cf = customFieldManager.getCustomFieldObject("当前处理人2");
if (issue.getCustomFieldValue(cf)) {
   Collection<ApplicationUser> list = issue.getCustomFieldValue(cf) as Collection<ApplicationUser>;
    if (list.size()>0) {
        def user = list?.getAt(0).getDirtoryUser();
        mutableIssue.setCustomFieldValue(cf,user)
       // mutableIssue.setAssignee(user);a
        appList.addAll(list);
        appList.add(thisUser);
        for(ApplicationUser applicationUser : appList) {
            watcherManager.startWatching(applicationUser,issue);
        }
        issueManager.updateIssue(event.getUser(),mutableIssue, EventDispatchOption.ISSUE_ASSIGNED,false);
    }
}

[zhaoyawei]

Both the handler and the current handler 2 can get this, how do I use the handler to update the current handler 2 (the current handler 2 is a custom field)