org.springframework.batch.core.launch
Interface JobOperator

All Known Implementing Classes:

SimpleJobOperator

public interface JobOperator

Low level interface for inspecting and controlling jobs with access only to primitive and collection types. Suitable for a command-line client (e.g. that launches a new process for each operation), or a remote launcher like a JMX console.

Since:

2.0

Author:

Dave Syer

Method Summary

List<Long>	getExecutions(long instanceId) List the JobExecutions associated with a particular JobInstance, in reverse order of creation (and therefore usually of execution).
List<Long>	getJobInstances(String jobName, int start, int count) List the JobInstances for a given job name, in reverse order of creation (and therefore usually of first execution).
Set<String>	getJobNames() List the available job names that can be launched with start(String, String).
String	getParameters(long executionId) Get the JobParameters as an easily readable String.
Set<Long>	getRunningExecutions(String jobName) Get the id values of all the running JobExecutions with the given job name.
Map<Long,String>	getStepExecutionSummaries(long executionId) Summarise the StepExecution instances belonging to the JobExecution with the supplied id, giving details of status, start and end times etc.
String	getSummary(long executionId) Summarise the JobExecution with the supplied id, giving details of status, start and end times etc.
Long	restart(long executionId) Restart a failed or stopped JobExecution.
Long	start(String jobName, String parameters) Start a new instance of a job with the parameters specified.
Long	startNextInstance(String jobName) Launch the next in a sequence of JobInstance determined by the JobParametersIncrementer attached to the specified job.
boolean	stop(long executionId) Send a stop signal to the JobExecution with the supplied id.

Method Detail

getExecutions

List<Long> getExecutions(long instanceId)
                         throws NoSuchJobInstanceException

List the JobExecutions associated with a particular JobInstance, in reverse order of creation (and therefore usually of execution).

Parameters:

instanceId - the id of a JobInstance

Returns:

the id values of all the JobExecutions associated with this instance

Throws:

NoSuchJobInstanceException

getJobInstances

List<Long> getJobInstances(String jobName,
                           int start,
                           int count)
                           throws NoSuchJobException

List the JobInstances for a given job name, in reverse order of creation (and therefore usually of first execution).

Parameters:

jobName - the job name that all the instances have

start - the start index of the instances

count - the maximum number of values to return

Returns:

the id values of the JobInstances

Throws:

NoSuchJobException

getRunningExecutions

Set<Long> getRunningExecutions(String jobName)
                               throws NoSuchJobException

Get the id values of all the running JobExecutions with the given job name.

Parameters:

jobName - the name of the job to search under

Returns:

the id values of the running JobExecution instances

Throws:

NoSuchJobException - if there are no JobExecutions with that job name

getParameters

String getParameters(long executionId)
                     throws NoSuchJobExecutionException

Get the JobParameters as an easily readable String.

Parameters:

executionId - the id of an existing JobExecution

Returns:

the job parameters that were used to launch the associated instance

Throws:

NoSuchJobExecutionException - if the id was not associated with any JobExecution

start

Long start(String jobName,
           String parameters)
           throws NoSuchJobException,
                  JobInstanceAlreadyExistsException,
                  JobParametersInvalidException

Start a new instance of a job with the parameters specified.

Parameters:

jobName - the name of the Job to launch

parameters - the parameters to launch it with (comma or newline separated name=value pairs)

Returns:

the id of the JobExecution that is launched

Throws:

NoSuchJobException - if there is no Job with the specified name

JobInstanceAlreadyExistsException - if a job instance with this name and parameters already exists

JobParametersInvalidException

restart

Long restart(long executionId)
             throws JobInstanceAlreadyCompleteException,
                    NoSuchJobExecutionException,
                    NoSuchJobException,
                    JobRestartException,
                    JobParametersInvalidException

Restart a failed or stopped JobExecution. Fails with an exception if the id provided does not exist or corresponds to a JobInstance that in normal circumstances already completed successfully.

Parameters:

executionId - the id of a failed or stopped JobExecution

Returns:

the id of the JobExecution that was started

Throws:

JobInstanceAlreadyCompleteException - if the job was already successfully completed

NoSuchJobExecutionException - if the id was not associated with any JobExecution

NoSuchJobException - if the JobExecution was found, but its corresponding Job is no longer available for launching

JobRestartException - if there is a non-specific error with the restart (e.g. corrupt or inconsistent restart data)

JobParametersInvalidException - if the parameters are not valid for this job

startNextInstance

Long startNextInstance(String jobName)
                       throws NoSuchJobException,
                              JobParametersNotFoundException,
                              JobRestartException,
                              JobExecutionAlreadyRunningException,
                              JobInstanceAlreadyCompleteException,
                              UnexpectedJobExecutionException,
                              JobParametersInvalidException

Launch the next in a sequence of JobInstance determined by the JobParametersIncrementer attached to the specified job. If the previous instance is still in a failed state, this method should still create a new instance and run it with different parameters (as long as the JobParametersIncrementer is working).

The last three exception described below should be extremely unlikely, but cannot be ruled out entirely. It points to some other thread or process trying to use this method (or a similar one) at the same time.

Parameters:

jobName - the name of the job to launch

Returns:

the JobExecution id of the execution created when the job is launched

Throws:

NoSuchJobException - if there is no such job definition available

JobParametersNotFoundException - if the parameters cannot be found

JobParametersInvalidException

UnexpectedJobExecutionException

UnexpectedJobExecutionException - if an unexpected condition arises

JobRestartException

JobExecutionAlreadyRunningException

JobInstanceAlreadyCompleteException

stop

boolean stop(long executionId)
             throws NoSuchJobExecutionException,
                    JobExecutionNotRunningException

Send a stop signal to the JobExecution with the supplied id. The signal is successfully sent if this method returns true, but that doesn't mean that the job has stopped. The only way to be sure of that is to poll the job execution status.

Parameters:

executionId - the id of a running JobExecution

Returns:

true if the message was successfully sent (does not guarantee that the job has stopped)

Throws:

NoSuchJobExecutionException - if there is no JobExecution with the id supplied

JobExecutionNotRunningException - if the JobExecution is not running (so cannot be stopped)

getSummary

String getSummary(long executionId)
                  throws NoSuchJobExecutionException

Summarise the JobExecution with the supplied id, giving details of status, start and end times etc.

Parameters:

executionId - the id of an existing JobExecution

Returns:

a String summarising the state of the job execution

Throws:

NoSuchJobExecutionException - if there is no JobExecution with the supplied id

getStepExecutionSummaries

Map<Long,String> getStepExecutionSummaries(long executionId)
                                           throws NoSuchJobExecutionException

Summarise the StepExecution instances belonging to the JobExecution with the supplied id, giving details of status, start and end times etc.

Parameters:

executionId - the id of an existing JobExecution

Returns:

a map of step execution id to String summarising the state of the execution

Throws:

NoSuchJobExecutionException - if there is no JobExecution with the supplied id

getJobNames

Set<String> getJobNames()

List the available job names that can be launched with start(String, String).

Returns:

a set of job names