import com.att.research.xacml.api.pap.PAPException;
import com.att.research.xacml.api.pap.PDPStatus;
import com.att.research.xacml.util.XACMLProperties;
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import java.net.ConnectException;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Set;
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import org.onap.policy.common.logging.eelf.MessageCodes;
import org.onap.policy.common.logging.eelf.PolicyLogger;
import org.onap.policy.common.logging.flexlogger.FlexLogger;
import org.onap.policy.xacml.api.pap.OnapPDPGroup;
import org.onap.policy.xacml.api.pap.PAPPolicyEngine;
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/**
* Heartbeat thread - periodically check on PDPs' status.
* Heartbeat with all known PDPs.