SemaphoreTokenTargetPreparer

public class SemaphoreTokenTargetPreparer
extends BaseTargetPreparer implements ITargetCleaner

java.lang.Object
↳	com.android.tradefed.targetprep.BaseTargetPreparer
	↳	com.android.tradefed.targetprep.SemaphoreTokenTargetPreparer

This is a preparer used to use token to serialize test excution in tradefed host. only the device acquire token will be allow to start the test. Others will wait until it released This can't be only used when you have one test in tradefed and use shared resources. Please make sure only a single test running on the host with different DUTs User need to add --semaphore-token:no-disable in the command file.

Summary

Public constructors
`SemaphoreTokenTargetPreparer()`

Public methods
`void`	`setUp(ITestDevice device, IBuildInfo buildInfo)` Perform the target setup for testing.
`void`	`tearDown(ITestDevice device, IBuildInfo buildInfo, Throwable e)` Perform the target cleanup/teardown after testing.

Public constructors

SemaphoreTokenTargetPreparer

public SemaphoreTokenTargetPreparer ()

Public methods

setUp

public void setUp (ITestDevice device, 
                IBuildInfo buildInfo)

Perform the target setup for testing.

Parameters
`device`	`ITestDevice`: the `ITestDevice` to prepare.
`buildInfo`	`IBuildInfo`: data about the build under test.

Throws
`DeviceNotAvailableException`
`TargetSetupError`

tearDown

public void tearDown (ITestDevice device, 
                IBuildInfo buildInfo, 
                Throwable e)

Perform the target cleanup/teardown after testing.

Parameters
`device`	`ITestDevice`: the `ITestDevice` to prepare.
`buildInfo`	`IBuildInfo`: data about the build under test.
`e`	`Throwable`: if the invocation ended with an exception, this will be the exception that was caught at the Invocation level. Otherwise, will be `null`.

Throws
`DeviceNotAvailableException`