io.dropwizard.metrics

Class InstrumentedExecutors

java.lang.Object

io.dropwizard.metrics.InstrumentedExecutors

public final class InstrumentedExecutors
extends Object

Factory and utility methods for InstrumentedExecutorService, InstrumentedScheduledExecutorService, and InstrumentedThreadFactory classes defined in this package. This class supports the following kinds of methods:

• Methods that create and return an InstrumentedExecutorService set up with commonly useful configuration settings.
• Methods that create and return a InstrumentedScheduledExecutorService set up with commonly useful configuration settings.
• Methods that create and return a "wrapped" ExecutorService, that disables reconfiguration by making implementation-specific methods inaccessible.
• Methods that create and return a InstrumentedThreadFactory that sets newly created threads to a known state.

See Also:

Executors

Method Summary

Modifier and Type	Method and Description
static InstrumentedThreadFactory	defaultThreadFactory(MetricRegistry registry) Returns an instrumented default thread factory used to create new threads.
static InstrumentedThreadFactory	defaultThreadFactory(MetricRegistry registry, String name) Returns an instrumented default thread factory used to create new threads.
static InstrumentedExecutorService	newCachedThreadPool(MetricRegistry registry) Creates an instrumented thread pool that creates new threads as needed, but will reuse previously constructed threads when they are available.
static InstrumentedExecutorService	newCachedThreadPool(MetricRegistry registry, String name) Creates an instrumented thread pool that creates new threads as needed, but will reuse previously constructed threads when they are available.
static InstrumentedExecutorService	newCachedThreadPool(ThreadFactory threadFactory, MetricRegistry registry) Creates an instrumented thread pool that creates new threads as needed, but will reuse previously constructed threads when they are available, and uses the provided ThreadFactory to create new threads when needed.
static InstrumentedExecutorService	newCachedThreadPool(ThreadFactory threadFactory, MetricRegistry registry, String name) Creates an instrumented thread pool that creates new threads as needed, but will reuse previously constructed threads when they are available, and uses the provided ThreadFactory to create new threads when needed.
static InstrumentedExecutorService	newFixedThreadPool(int nThreads, MetricRegistry registry) Creates an instrumented thread pool that reuses a fixed number of threads operating off a shared unbounded queue.
static InstrumentedExecutorService	newFixedThreadPool(int nThreads, MetricRegistry registry, String name) Creates an instrumented thread pool that reuses a fixed number of threads operating off a shared unbounded queue.
static InstrumentedExecutorService	newFixedThreadPool(int nThreads, ThreadFactory threadFactory, MetricRegistry registry) Creates a thread pool that reuses a fixed number of threads operating off a shared unbounded queue, using the provided ThreadFactory to create new threads when needed.
static InstrumentedExecutorService	newFixedThreadPool(int nThreads, ThreadFactory threadFactory, MetricRegistry registry, String name) Creates an instrumented thread pool that reuses a fixed number of threads operating off a shared unbounded queue, using the provided ThreadFactory to create new threads when needed.
static InstrumentedScheduledExecutorService	newScheduledThreadPool(int corePoolSize, MetricRegistry registry) Creates an instrumented thread pool that can schedule commands to run after a given delay, or to execute periodically.
static InstrumentedScheduledExecutorService	newScheduledThreadPool(int corePoolSize, MetricRegistry registry, String name) Creates an instrumented thread pool that can schedule commands to run after a given delay, or to execute periodically.
static InstrumentedScheduledExecutorService	newScheduledThreadPool(int corePoolSize, ThreadFactory threadFactory, MetricRegistry registry) Creates an instrumented thread pool that can schedule commands to run after a given delay, or to execute periodically.
static InstrumentedScheduledExecutorService	newScheduledThreadPool(int corePoolSize, ThreadFactory threadFactory, MetricRegistry registry, String name) Creates an instrumented thread pool that can schedule commands to run after a given delay, or to execute periodically.
static InstrumentedExecutorService	newSingleThreadExecutor(MetricRegistry registry) Creates an Executor that uses a single worker thread operating off an unbounded queue.
static InstrumentedExecutorService	newSingleThreadExecutor(MetricRegistry registry, String name) Creates an InstrumentedExecutor that uses a single worker thread operating off an unbounded queue.
static InstrumentedExecutorService	newSingleThreadExecutor(ThreadFactory threadFactory, MetricRegistry registry) Creates an InstrumentedExecutor that uses a single worker thread operating off an unbounded queue, and uses the provided ThreadFactory to create a new thread when needed.
static InstrumentedExecutorService	newSingleThreadExecutor(ThreadFactory threadFactory, MetricRegistry registry, String name) Creates an InstrumentedExecutor that uses a single worker thread operating off an unbounded queue, and uses the provided ThreadFactory to create a new thread when needed.
static InstrumentedScheduledExecutorService	newSingleThreadScheduledExecutor(MetricRegistry registry) Creates a single-threaded instrumented executor that can schedule commands to run after a given delay, or to execute periodically.
static InstrumentedScheduledExecutorService	newSingleThreadScheduledExecutor(MetricRegistry registry, String name) Creates a single-threaded instrumented executor that can schedule commands to run after a given delay, or to execute periodically.
static InstrumentedScheduledExecutorService	newSingleThreadScheduledExecutor(ThreadFactory threadFactory, MetricRegistry registry) Creates a single-threaded instrumented executor that can schedule commands to run after a given delay, or to execute periodically.
static InstrumentedScheduledExecutorService	newSingleThreadScheduledExecutor(ThreadFactory threadFactory, MetricRegistry registry, String name) Creates a single-threaded instrumented executor that can schedule commands to run after a given delay, or to execute periodically.
static InstrumentedThreadFactory	privilegedThreadFactory(MetricRegistry registry) Returns an instrumented thread factory used to create new threads that have the same permissions as the current thread.
static InstrumentedThreadFactory	privilegedThreadFactory(MetricRegistry registry, String name) Returns an instrumented thread factory used to create new threads that have the same permissions as the current thread.

Methods inherited from class java.lang.Object

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

Method Detail

newFixedThreadPool

public static InstrumentedExecutorService newFixedThreadPool(int nThreads,
                                                             MetricRegistry registry,
                                                             String name)

Creates an instrumented thread pool that reuses a fixed number of threads operating off a shared unbounded queue. At any point, at most nThreads threads will be active processing tasks. If additional tasks are submitted when all threads are active, they will wait in the queue until a thread is available. If any thread terminates due to a failure during execution prior to shutdown, a new one will take its place if needed to execute subsequent tasks. The threads in the pool will exist until it is explicitly shutdown.

Parameters:

nThreads - the number of threads in the pool

registry - the MetricRegistry that will contain the metrics.

name - the (metrics) name for this executor service, see MetricRegistry.name(String, String...).

Returns:

the newly created thread pool

Throws:

IllegalArgumentException - if nThreads <= 0

See Also:

Executors.newFixedThreadPool(int)

newFixedThreadPool

public static InstrumentedExecutorService newFixedThreadPool(int nThreads,
                                                             MetricRegistry registry)

Creates an instrumented thread pool that reuses a fixed number of threads operating off a shared unbounded queue. At any point, at most nThreads threads will be active processing tasks. If additional tasks are submitted when all threads are active, they will wait in the queue until a thread is available. If any thread terminates due to a failure during execution prior to shutdown, a new one will take its place if needed to execute subsequent tasks. The threads in the pool will exist until it is explicitly shutdown.

Parameters:

nThreads - the number of threads in the pool

registry - the MetricRegistry that will contain the metrics.

Returns:

the newly created thread pool

Throws:

IllegalArgumentException - if nThreads <= 0

See Also:

Executors.newFixedThreadPool(int)

newFixedThreadPool

public static InstrumentedExecutorService newFixedThreadPool(int nThreads,
                                                             ThreadFactory threadFactory,
                                                             MetricRegistry registry,
                                                             String name)

Creates an instrumented thread pool that reuses a fixed number of threads operating off a shared unbounded queue, using the provided ThreadFactory to create new threads when needed. At any point, at most nThreads threads will be active processing tasks. If additional tasks are submitted when all threads are active, they will wait in the queue until a thread is available. If any thread terminates due to a failure during execution prior to shutdown, a new one will take its place if needed to execute subsequent tasks. The threads in the pool will exist until it is explicitly shutdown.

Parameters:

nThreads - the number of threads in the pool

threadFactory - the factory to use when creating new threads

registry - the MetricRegistry that will contain the metrics.

name - the (metrics) name for this executor service, see MetricRegistry.name(String, String...).

Returns:

the newly created thread pool

Throws:

NullPointerException - if threadFactory is null

IllegalArgumentException - if nThreads <= 0

See Also:

Executors.newFixedThreadPool(int, ThreadFactory)

newFixedThreadPool

public static InstrumentedExecutorService newFixedThreadPool(int nThreads,
                                                             ThreadFactory threadFactory,
                                                             MetricRegistry registry)

Creates a thread pool that reuses a fixed number of threads operating off a shared unbounded queue, using the provided ThreadFactory to create new threads when needed. At any point, at most nThreads threads will be active processing tasks. If additional tasks are submitted when all threads are active, they will wait in the queue until a thread is available. If any thread terminates due to a failure during execution prior to shutdown, a new one will take its place if needed to execute subsequent tasks. The threads in the pool will exist until it is explicitly shutdown.

Parameters:

nThreads - the number of threads in the pool

threadFactory - the factory to use when creating new threads

registry - the MetricRegistry that will contain the metrics.

Returns:

the newly created thread pool

Throws:

NullPointerException - if threadFactory is null

IllegalArgumentException - if nThreads <= 0

See Also:

Executors.newFixedThreadPool(int, ThreadFactory)

newSingleThreadExecutor

public static InstrumentedExecutorService newSingleThreadExecutor(MetricRegistry registry,
                                                                  String name)

Creates an InstrumentedExecutor that uses a single worker thread operating off an unbounded queue. (Note however that if this single thread terminates due to a failure during execution prior to shutdown, a new one will take its place if needed to execute subsequent tasks.) Tasks are guaranteed to execute sequentially, and no more than one task will be active at any given time. Unlike the otherwise equivalent newFixedThreadPool(1) the returned executor is guaranteed not to be reconfigurable to use additional threads.

Parameters:

registry - the MetricRegistry that will contain the metrics.

name - the (metrics) name for this executor service, see MetricRegistry.name(String, String...).

Returns:

the newly created single-threaded Executor

See Also:

Executors.newSingleThreadExecutor()

newSingleThreadExecutor

public static InstrumentedExecutorService newSingleThreadExecutor(MetricRegistry registry)

Creates an Executor that uses a single worker thread operating off an unbounded queue. (Note however that if this single thread terminates due to a failure during execution prior to shutdown, a new one will take its place if needed to execute subsequent tasks.) Tasks are guaranteed to execute sequentially, and no more than one task will be active at any given time. Unlike the otherwise equivalent newFixedThreadPool(1) the returned executor is guaranteed not to be reconfigurable to use additional threads.

Parameters:

registry - the MetricRegistry that will contain the metrics.

Returns:

the newly created single-threaded Executor

See Also:

Executors.newSingleThreadExecutor()

newSingleThreadExecutor

public static InstrumentedExecutorService newSingleThreadExecutor(ThreadFactory threadFactory,
                                                                  MetricRegistry registry,
                                                                  String name)

Creates an InstrumentedExecutor that uses a single worker thread operating off an unbounded queue, and uses the provided ThreadFactory to create a new thread when needed. Unlike the otherwise equivalent newFixedThreadPool(1, threadFactory) the returned executor is guaranteed not to be reconfigurable to use additional threads.

Parameters:

threadFactory - the factory to use when creating new threads

registry - the MetricRegistry that will contain the metrics.

name - the (metrics) name for this executor service, see MetricRegistry.name(String, String...).

Returns:

the newly created single-threaded Executor

Throws:

NullPointerException - if threadFactory is null

See Also:

Executors.newSingleThreadExecutor(ThreadFactory)

newSingleThreadExecutor

public static InstrumentedExecutorService newSingleThreadExecutor(ThreadFactory threadFactory,
                                                                  MetricRegistry registry)

Creates an InstrumentedExecutor that uses a single worker thread operating off an unbounded queue, and uses the provided ThreadFactory to create a new thread when needed. Unlike the otherwise equivalent newFixedThreadPool(1, threadFactory) the returned executor is guaranteed not to be reconfigurable to use additional threads.

Parameters:

threadFactory - the factory to use when creating new threads

registry - the MetricRegistry that will contain the metrics.

Returns:

the newly created single-threaded Executor

Throws:

NullPointerException - if threadFactory is null

See Also:

Executors.newSingleThreadExecutor(ThreadFactory)

newCachedThreadPool

public static InstrumentedExecutorService newCachedThreadPool(MetricRegistry registry,
                                                              String name)

Creates an instrumented thread pool that creates new threads as needed, but will reuse previously constructed threads when they are available. These pools will typically improve the performance of programs that execute many short-lived asynchronous tasks. Calls to execute will reuse previously constructed threads if available. If no existing thread is available, a new thread will be created and added to the pool. Threads that have not been used for sixty seconds are terminated and removed from the cache. Thus, a pool that remains idle for long enough will not consume any resource. Note that pools with similar properties but different details (for example, timeout parameters) may be created using ThreadPoolExecutor constructors.

Parameters:

registry - the MetricRegistry that will contain the metrics.

name - the (metrics) name for this executor service, see MetricRegistry.name(String, String...).

Returns:

the newly created thread pool

See Also:

Executors.newCachedThreadPool()

newCachedThreadPool

public static InstrumentedExecutorService newCachedThreadPool(MetricRegistry registry)

Creates an instrumented thread pool that creates new threads as needed, but will reuse previously constructed threads when they are available. These pools will typically improve the performance of programs that execute many short-lived asynchronous tasks. Calls to execute will reuse previously constructed threads if available. If no existing thread is available, a new thread will be created and added to the pool. Threads that have not been used for sixty seconds are terminated and removed from the cache. Thus, a pool that remains idle for long enough will not consume any resource. Note that pools with similar properties but different details (for example, timeout parameters) may be created using ThreadPoolExecutor constructors.

Parameters:

registry - the MetricRegistry that will contain the metrics.

Returns:

the newly created thread pool

See Also:

Executors.newCachedThreadPool()

newCachedThreadPool

public static InstrumentedExecutorService newCachedThreadPool(ThreadFactory threadFactory,
                                                              MetricRegistry registry,
                                                              String name)

Creates an instrumented thread pool that creates new threads as needed, but will reuse previously constructed threads when they are available, and uses the provided ThreadFactory to create new threads when needed.

Parameters:

threadFactory - the factory to use when creating new threads

registry - the MetricRegistry that will contain the metrics.

name - the (metrics) name for this executor service, see MetricRegistry.name(String, String...).

Returns:

the newly created thread pool

Throws:

NullPointerException - if threadFactory is null

See Also:

Executors.newCachedThreadPool(ThreadFactory)

newCachedThreadPool

public static InstrumentedExecutorService newCachedThreadPool(ThreadFactory threadFactory,
                                                              MetricRegistry registry)

Creates an instrumented thread pool that creates new threads as needed, but will reuse previously constructed threads when they are available, and uses the provided ThreadFactory to create new threads when needed.

Parameters:

threadFactory - the factory to use when creating new threads

registry - the MetricRegistry that will contain the metrics.

Returns:

the newly created thread pool

Throws:

NullPointerException - if threadFactory is null

See Also:

Executors.newCachedThreadPool(ThreadFactory)

newSingleThreadScheduledExecutor

public static InstrumentedScheduledExecutorService newSingleThreadScheduledExecutor(MetricRegistry registry,
                                                                                    String name)

Creates a single-threaded instrumented executor that can schedule commands to run after a given delay, or to execute periodically. (Note however that if this single thread terminates due to a failure during execution prior to shutdown, a new one will take its place if needed to execute subsequent tasks.) Tasks are guaranteed to execute sequentially, and no more than one task will be active at any given time. Unlike the otherwise equivalent newScheduledThreadPool(1) the returned executor is guaranteed not to be reconfigurable to use additional threads.

Parameters:

registry - the MetricRegistry that will contain the metrics.

name - the (metrics) name for this executor service, see MetricRegistry.name(String, String...).

Returns:

the newly created scheduled executor

See Also:

Executors.newSingleThreadScheduledExecutor()

newSingleThreadScheduledExecutor

public static InstrumentedScheduledExecutorService newSingleThreadScheduledExecutor(MetricRegistry registry)

Creates a single-threaded instrumented executor that can schedule commands to run after a given delay, or to execute periodically. (Note however that if this single thread terminates due to a failure during execution prior to shutdown, a new one will take its place if needed to execute subsequent tasks.) Tasks are guaranteed to execute sequentially, and no more than one task will be active at any given time. Unlike the otherwise equivalent newScheduledThreadPool(1) the returned executor is guaranteed not to be reconfigurable to use additional threads.

Parameters:

registry - the MetricRegistry that will contain the metrics.

Returns:

the newly created scheduled executor

See Also:

Executors.newSingleThreadScheduledExecutor()

newSingleThreadScheduledExecutor

public static InstrumentedScheduledExecutorService newSingleThreadScheduledExecutor(ThreadFactory threadFactory,
                                                                                    MetricRegistry registry,
                                                                                    String name)

Creates a single-threaded instrumented executor that can schedule commands to run after a given delay, or to execute periodically. (Note however that if this single thread terminates due to a failure during execution prior to shutdown, a new one will take its place if needed to execute subsequent tasks.) Tasks are guaranteed to execute sequentially, and no more than one task will be active at any given time. Unlike the otherwise equivalent newScheduledThreadPool(1, threadFactory) the returned executor is guaranteed not to be reconfigurable to use additional threads.

Parameters:

threadFactory - the factory to use when creating new threads

registry - the MetricRegistry that will contain the metrics.

name - the (metrics) name for this executor service, see MetricRegistry.name(String, String...).

Returns:

a newly created scheduled executor

Throws:

NullPointerException - if threadFactory is null

See Also:

Executors.newSingleThreadExecutor(ThreadFactory)

newSingleThreadScheduledExecutor

public static InstrumentedScheduledExecutorService newSingleThreadScheduledExecutor(ThreadFactory threadFactory,
                                                                                    MetricRegistry registry)

Creates a single-threaded instrumented executor that can schedule commands to run after a given delay, or to execute periodically. (Note however that if this single thread terminates due to a failure during execution prior to shutdown, a new one will take its place if needed to execute subsequent tasks.) Tasks are guaranteed to execute sequentially, and no more than one task will be active at any given time. Unlike the otherwise equivalent newScheduledThreadPool(1, threadFactory) the returned executor is guaranteed not to be reconfigurable to use additional threads.

Parameters:

threadFactory - the factory to use when creating new threads

registry - the MetricRegistry that will contain the metrics.

Returns:

a newly created scheduled executor

Throws:

NullPointerException - if threadFactory is null

See Also:

Executors.newSingleThreadExecutor(ThreadFactory)

newScheduledThreadPool

public static InstrumentedScheduledExecutorService newScheduledThreadPool(int corePoolSize,
                                                                          MetricRegistry registry,
                                                                          String name)

Creates an instrumented thread pool that can schedule commands to run after a given delay, or to execute periodically.

Parameters:

corePoolSize - the number of threads to keep in the pool, even if they are idle

registry - the MetricRegistry that will contain the metrics.

name - the (metrics) name for this executor service, see MetricRegistry.name(String, String...).

Returns:

a newly created scheduled thread pool

Throws:

IllegalArgumentException - if corePoolSize < 0

See Also:

Executors.newScheduledThreadPool(int)

newScheduledThreadPool

public static InstrumentedScheduledExecutorService newScheduledThreadPool(int corePoolSize,
                                                                          MetricRegistry registry)

Creates an instrumented thread pool that can schedule commands to run after a given delay, or to execute periodically.

Parameters:

corePoolSize - the number of threads to keep in the pool, even if they are idle

registry - the MetricRegistry that will contain the metrics.

Returns:

a newly created scheduled thread pool

Throws:

IllegalArgumentException - if corePoolSize < 0

See Also:

Executors.newScheduledThreadPool(int)

newScheduledThreadPool

public static InstrumentedScheduledExecutorService newScheduledThreadPool(int corePoolSize,
                                                                          ThreadFactory threadFactory,
                                                                          MetricRegistry registry,
                                                                          String name)

Creates an instrumented thread pool that can schedule commands to run after a given delay, or to execute periodically.

Parameters:

corePoolSize - the number of threads to keep in the pool, even if they are idle

threadFactory - the factory to use when the executor creates a new thread

registry - the MetricRegistry that will contain the metrics.

name - the (metrics) name for this executor service, see MetricRegistry.name(String, String...).

Returns:

a newly created scheduled thread pool

Throws:

IllegalArgumentException - if corePoolSize < 0

NullPointerException - if threadFactory is null

See Also:

Executors.newScheduledThreadPool(int, ThreadFactory)

newScheduledThreadPool

public static InstrumentedScheduledExecutorService newScheduledThreadPool(int corePoolSize,
                                                                          ThreadFactory threadFactory,
                                                                          MetricRegistry registry)

Creates an instrumented thread pool that can schedule commands to run after a given delay, or to execute periodically.

Parameters:

corePoolSize - the number of threads to keep in the pool, even if they are idle

threadFactory - the factory to use when the executor creates a new thread

registry - the MetricRegistry that will contain the metrics.

Returns:

a newly created scheduled thread pool

Throws:

IllegalArgumentException - if corePoolSize < 0

NullPointerException - if threadFactory is null

See Also:

Executors.newScheduledThreadPool(int, ThreadFactory)

defaultThreadFactory

public static InstrumentedThreadFactory defaultThreadFactory(MetricRegistry registry,
                                                             String name)

Returns an instrumented default thread factory used to create new threads. This factory creates all new threads used by an Executor in the same ThreadGroup. If there is a SecurityManager, it uses the group of System.getSecurityManager(), else the group of the thread invoking this defaultThreadFactory method. Each new thread is created as a non-daemon thread with priority set to the smaller of Thread.NORM_PRIORITY and the maximum priority permitted in the thread group. New threads have names accessible via Thread.getName() of pool-N-thread-M, where N is the sequence number of this factory, and M is the sequence number of the thread created by this factory.

Parameters:

registry - the MetricRegistry that will contain the metrics.

name - the (metrics) name for this executor service, see MetricRegistry.name(String, String...).

Returns:

a thread factory

See Also:

Executors.defaultThreadFactory()

defaultThreadFactory

public static InstrumentedThreadFactory defaultThreadFactory(MetricRegistry registry)

Returns an instrumented default thread factory used to create new threads. This factory creates all new threads used by an Executor in the same ThreadGroup. If there is a SecurityManager, it uses the group of System.getSecurityManager(), else the group of the thread invoking this defaultThreadFactory method. Each new thread is created as a non-daemon thread with priority set to the smaller of Thread.NORM_PRIORITY and the maximum priority permitted in the thread group. New threads have names accessible via Thread.getName() of pool-N-thread-M, where N is the sequence number of this factory, and M is the sequence number of the thread created by this factory.

Parameters:

registry - the MetricRegistry that will contain the metrics.

Returns:

a thread factory

See Also:

Executors.defaultThreadFactory()

privilegedThreadFactory

public static InstrumentedThreadFactory privilegedThreadFactory(MetricRegistry registry,
                                                                String name)

Returns an instrumented thread factory used to create new threads that have the same permissions as the current thread.

This factory creates threads with the same settings as Executors.defaultThreadFactory(), additionally setting the AccessControlContext and contextClassLoader of new threads to be the same as the thread invoking this privilegedThreadFactory method. A new privilegedThreadFactory can be created within an AccessController.doPrivileged action setting the current thread's access control context to create threads with the selected permission settings holding within that action.

Note that while tasks running within such threads will have the same access control and class loader settings as the current thread, they need not have the same ThreadLocal or InheritableThreadLocal values. If necessary, particular values of thread locals can be set or reset before any task runs in ThreadPoolExecutor subclasses using ThreadPoolExecutor.beforeExecute(Thread, Runnable). Also, if it is necessary to initialize worker threads to have the same InheritableThreadLocal settings as some other designated thread, you can create a custom ThreadFactory in which that thread waits for and services requests to create others that will inherit its values.

Parameters:

registry - the MetricRegistry that will contain the metrics.

name - the (metrics) name for this executor service, see MetricRegistry.name(String, String...).

Returns:

a thread factory

Throws:

AccessControlException - if the current access control context does not have permission to both get and set context class loader

See Also:

Executors.privilegedThreadFactory()

privilegedThreadFactory

public static InstrumentedThreadFactory privilegedThreadFactory(MetricRegistry registry)

Returns an instrumented thread factory used to create new threads that have the same permissions as the current thread.

This factory creates threads with the same settings as Executors.defaultThreadFactory(), additionally setting the AccessControlContext and contextClassLoader of new threads to be the same as the thread invoking this privilegedThreadFactory method. A new privilegedThreadFactory can be created within an AccessController.doPrivileged action setting the current thread's access control context to create threads with the selected permission settings holding within that action.

Note that while tasks running within such threads will have the same access control and class loader settings as the current thread, they need not have the same ThreadLocal or InheritableThreadLocal values. If necessary, particular values of thread locals can be set or reset before any task runs in ThreadPoolExecutor subclasses using ThreadPoolExecutor.beforeExecute(Thread, Runnable). Also, if it is necessary to initialize worker threads to have the same InheritableThreadLocal settings as some other designated thread, you can create a custom ThreadFactory in which that thread waits for and services requests to create others that will inherit its values.

Parameters:

registry - the MetricRegistry that will contain the metrics.

Returns:

a thread factory

Throws:

AccessControlException - if the current access control context does not have permission to both get and set context class loader

See Also:

Executors.privilegedThreadFactory()