org.camunda.bpm.engine.impl

Class BootstrapEngineCommand

java.lang.Object

org.camunda.bpm.engine.impl.BootstrapEngineCommand

All Implemented Interfaces:

Command<Void>, ProcessEngineBootstrapCommand

public class BootstrapEngineCommand
extends Object
implements ProcessEngineBootstrapCommand

Author:

Nikola Koevski

Field Summary

Fields

Modifier and Type	Field and Description
protected static String	INSTALLATION_PROPERTY_NAME
protected static String	TELEMETRY_PROPERTY_NAME

Constructor Summary

Constructors

Constructor and Description
BootstrapEngineCommand()

Method Summary

Modifier and Type	Method and Description
protected void	acquireExclusiveInstallationIdLock(CommandContext commandContext)
protected void	acquireExclusiveTelemetryLock(CommandContext commandContext)
void	checkDeploymentLockExists(CommandContext commandContext)
void	checkHistoryCleanupLockExists(CommandContext commandContext)
protected void	checkInstallationIdLockExists(CommandContext commandContext)
protected void	checkTelemetryLockExists(CommandContext commandContext)
protected void	createHistoryCleanupJob(CommandContext commandContext)
protected void	createInstallationProperty(CommandContext commandContext)
protected void	createTelemetryProperty(CommandContext commandContext)
protected String	databaseInstallationId(CommandContext commandContext)
protected PropertyEntity	databaseTelemetryConfiguration(CommandContext commandContext)
Void	execute(CommandContext commandContext)
void	initializeInstallationId(CommandContext commandContext)
void	initializeTelemetryProperty(CommandContext commandContext)
protected boolean	isHistoryCleanupEnabled(CommandContext commandContext)
boolean	isRetryable() When CockroachDB is used, this command may be retried multiple times until it is successful, or the retries are exhausted.
protected void	startTelemetryReporter(CommandContext commandContext)
protected void	updateTelemetryData(CommandContext commandContext)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

TELEMETRY_PROPERTY_NAME

protected static final String TELEMETRY_PROPERTY_NAME

See Also:

Constant Field Values

INSTALLATION_PROPERTY_NAME

protected static final String INSTALLATION_PROPERTY_NAME

See Also:

Constant Field Values

Constructor Detail

BootstrapEngineCommand

public BootstrapEngineCommand()

Method Detail

execute

public Void execute(CommandContext commandContext)

Specified by:

execute in interface Command<Void>

createHistoryCleanupJob

protected void createHistoryCleanupJob(CommandContext commandContext)

checkDeploymentLockExists

public void checkDeploymentLockExists(CommandContext commandContext)

checkHistoryCleanupLockExists

public void checkHistoryCleanupLockExists(CommandContext commandContext)

isHistoryCleanupEnabled

protected boolean isHistoryCleanupEnabled(CommandContext commandContext)

initializeTelemetryProperty

public void initializeTelemetryProperty(CommandContext commandContext)

checkTelemetryLockExists

protected void checkTelemetryLockExists(CommandContext commandContext)

databaseTelemetryConfiguration

protected PropertyEntity databaseTelemetryConfiguration(CommandContext commandContext)

createTelemetryProperty

protected void createTelemetryProperty(CommandContext commandContext)

initializeInstallationId

public void initializeInstallationId(CommandContext commandContext)

createInstallationProperty

protected void createInstallationProperty(CommandContext commandContext)

databaseInstallationId

protected String databaseInstallationId(CommandContext commandContext)

checkInstallationIdLockExists

protected void checkInstallationIdLockExists(CommandContext commandContext)

updateTelemetryData

protected void updateTelemetryData(CommandContext commandContext)

startTelemetryReporter

protected void startTelemetryReporter(CommandContext commandContext)

acquireExclusiveTelemetryLock

protected void acquireExclusiveTelemetryLock(CommandContext commandContext)

acquireExclusiveInstallationIdLock

protected void acquireExclusiveInstallationIdLock(CommandContext commandContext)

isRetryable

public boolean isRetryable()

When CockroachDB is used, this command may be retried multiple times until it is successful, or the retries are exhausted. CockroachDB uses a stricter, SERIALIZABLE transaction isolation which ensures a serialized manner of transaction execution. A concurrent transaction that attempts to modify the same data as another transaction is required to abort, rollback and retry. This also makes our use-case of pessimistic locks redundant since we only use them as synchronization barriers, and not to lock actual data which would protect it from concurrent modifications. The BootstrapEngine command only executes internal code, so we are certain that a retry of a failed engine bootstrap will not impact user data, and may be performed multiple times.

Specified by:

isRetryable in interface Command<Void>

Returns:

true if the CrdbTransactionRetryInterceptor can make a transparent retry of this command upon failure with a CrdbTransactionRetryException (only used when running on CockroachDB).