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Oracle Coherence Community Edition
/*
* Copyright (c) 2000, 2020, Oracle and/or its affiliates.
*
* Licensed under the Universal Permissive License v 1.0 as shown at
* http://oss.oracle.com/licenses/upl.
*/
package com.tangosol.internal.net.cluster;
import com.tangosol.net.CacheFactory;
import com.tangosol.net.Cluster;
import com.tangosol.net.GuardSupport;
import com.tangosol.net.Guardable;
import com.tangosol.net.Guardian.GuardContext;
import com.tangosol.net.Service;
import com.tangosol.net.ServiceFailurePolicy;
import com.tangosol.util.Base;
import com.tangosol.util.ClassHelper;
/**
* DefaultServiceFailurePolicy is the default implementation of ServiceFailurePolicy.
*
* @author pfm
* @since Coherence 3.7.1
*/
public class DefaultServiceFailurePolicy
implements ServiceFailurePolicy
{
// ----- constructors ---------------------------------------------------
/**
* Construct a new DefaultServiceFailurePolicy and set the policy type.
*
* @param nPolicyType the policy type
*/
public DefaultServiceFailurePolicy(int nPolicyType)
{
m_nPolicyType = nPolicyType;
}
// ----- ServiceFailurePolicy interface ---------------------------------
/**
* {@inheritDoc}
*/
@Override
public void onGuardableRecovery(Guardable guardable, Service service)
{
// Always log stack traces
GuardSupport.logStackTraces();
switch (getPolicyType())
{
default:
case POLICY_EXIT_CLUSTER:
case POLICY_EXIT_PROCESS:
// default policies simply delegate recover()
CacheFactory.log("Attempting recovery of " + guardable, CacheFactory.LOG_WARN);
guardable.recover();
break;
case POLICY_LOGGING:
// issue a synthetic heartbeat here that will cause the
// guardable to become "healthy" once again. This allows
// the guardable to remain guarded after logging.
CacheFactory.log("Logging stacktrace due to soft-timeout", CacheFactory.LOG_WARN);
// COH-3420: the guardable could have been already abandoned/released
// by its guardian
GuardContext context = guardable.getContext();
if (context != null)
{
context.heartbeat();
}
break;
}
}
/**
* {@inheritDoc}
*/
@Override
public void onGuardableTerminate(Guardable guardable, Service service)
{
// always log stack traces
GuardSupport.logStackTraces();
switch (getPolicyType())
{
default:
case POLICY_EXIT_CLUSTER:
case POLICY_EXIT_PROCESS:
// default policies simply delegate terminate()
CacheFactory.log("Terminating " + guardable, CacheFactory.LOG_WARN);
guardable.terminate();
break;
case POLICY_LOGGING:
// shouldn't be able to get here, as recovery should have
// issued a heartbeat to keep this guardable "healthy"
break;
}
}
/**
* {@inheritDoc}
*/
@Override
public void onServiceFailed(Cluster cluster)
{
// Note: we are running on a post-termination thread
String sHeader = "Coherence : ";
switch (getPolicyType())
{
default:
case POLICY_EXIT_CLUSTER:
{
System.err.println(sHeader +
"Halting this cluster node due to unrecoverable service failure");
System.err.flush();
try
{
// halt the cluster
ClassHelper.invoke(cluster, "halt", ClassHelper.VOID);
}
catch (Exception e)
{
throw Base.ensureRuntimeException(e, "Unexpected exception while halting the cluster.");
}
finally
{
// only after halting, print the cluster state
System.err.println(sHeader + "Halted the cluster:\n" + cluster.toString());
System.err.flush();
}
}
break;
case POLICY_EXIT_PROCESS:
System.err.println(sHeader +
"Halting JVM due to unrecoverable service failure");
System.err.flush();
Runtime.getRuntime().halt(-1);
break;
}
}
// ----- DefaultServiceFailurePolicy methods ----------------------------
/**
* Return the policy type.
*
* @return the policy type
*/
public int getPolicyType()
{
return m_nPolicyType;
}
// ----- Object methods -------------------------------------------------
/**
* {@inheritDoc}
*/
@Override
public String toString()
{
String sType;
switch (getPolicyType())
{
case POLICY_EXIT_CLUSTER:
sType = "exit cluster";
break;
case POLICY_EXIT_PROCESS:
sType = "exit process";
break;
case POLICY_LOGGING:
sType = "logging";
break;
default:
sType = "unknown";
break;
}
return "DefaultServiceFailurePolicy{PolicyType=" + sType + "}";
}
// ----- constants ------------------------------------------------------
/**
* This policy will cause the cluster service to be shut down if this service fails.
*/
public static final int POLICY_EXIT_CLUSTER = 1;
/**
* This policy will cause the JVM to terminate if this service fails.
*/
public static final int POLICY_EXIT_PROCESS = 2;
/**
* This policy will cause an error being logged if this service fails.
*/
public static final int POLICY_LOGGING = 3;
// ----- data members ---------------------------------------------------
/**
* The policy type specifies the action to take when an abnormally behaving service
* cannot be terminated gracefully by the service guardian.
*/
private int m_nPolicyType;
/**
* The default timeout to use with a "logging" policy. This timeout is used when the logging policy
* is enforced as a result of a (mis)configured guardian-timeout of 0ms.
*/
public static final int DEFAULT_LOGGING_INTERVAL = 60000;
}