Product Key In Registry

[Exequiel Mondragon]

Itallows developers to lookup one or more processes with a given key.If the registry has :unique keys, a key points to 0 or 1 process.If the registry allows :duplicate keys, a single key may point to anynumber of processes. In both cases, different keys could identify thesame process.

Each entry in the registry is associated to the process that hasregistered the key. If the process crashes, the keys associated to thatprocess are automatically removed. All key comparisons in the registryare done using the match operation (===/2).

The registry can be used for different purposes, such as name lookups (usingthe :via option), storing properties, custom dispatching rules, or a pubsubimplementation. We explore some of those use cases below.

By calling register/3, different processes can register under a given keyand associate any value under that key. In this case, let's register thecurrent process under the key "hello" and attach the IO, :inspect tupleto it:

Now, an entity interested in dispatching events for a given key may calldispatch/3 passing in the key and a callback. This callback will be invokedwith a list of all the values registered under the requested key, alongsidethe PID of the process that registered each value, in the form of pid, value tuples. In our example, value will be the module, function tuplein the code above:

Dispatching happens in the process that calls dispatch/3 either serially orconcurrently in case of multiple partitions (via spawned tasks). Theregistered processes are not involved in dispatching unless involving them isdone explicitly (for example, by sending them a message in the callback).

Furthermore, if there is a failure when dispatching, due to a badregistration, dispatching will always fail and the registered process will notbe notified. Therefore let's make sure we at least wrap and report thoseerrors:

Registries can also be used to implement a local, non-distributed, scalablePubSub by relying on the dispatch/3 function, similarly to the previoussection: in this case, however, we will send messages to each associatedprocess, instead of invoking a given module-function.

The third argument given to register/3 is a value associated to thecurrent process. While in the previous section we used it when dispatching,in this particular example we are not interested in it, so we have set itto an empty list. You could store a more meaningful value if necessary.

Looking up, dispatching and registering are efficient and immediate atthe cost of delayed unsubscription. For example, if a process crashes,its keys are automatically removed from the registry but the change maynot propagate immediately. This means certain operations may return processesthat are already dead. When such may happen, it will be explicitly statedin the function documentation.

However, keep in mind those cases are typically not an issue. After all, aprocess referenced by a PID may crash at any time, including between gettingthe value from the registry and sending it a message. Many parts of the standardlibrary are designed to cope with that, such as Process.monitor/1 which willdeliver the :DOWN message immediately if the monitored process is already deadand send/2 which acts as a no-op for dead processes.

Pattern must be an atom or a tuple that will match the structure of thevalue stored in the registry. The atom :_ can be used to ignore a givenvalue or tuple element, while the atom :"$1" can be used to temporarily assign partof pattern to a variable for a subsequent comparison.

The list of entries is a non-empty list of two-element tuples wherethe first element is the PID and the second element is the valueassociated to the PID. If there are no entries for the given key,the callback is never invoked.

If the registry is partitioned, the callback is invoked multiple timesper partition. If the registry is partitioned and parallel: true isgiven as an option, the dispatching happens in parallel. In both cases,the callback is only invoked if there are entries for that partition.

If the registry is unique, the keys are unique. Otherwisethey may contain duplicates if the process was registeredunder the same key multiple times. The list will be emptyif the process is dead or it has no keys in this registry.

For intensive workloads, the registry may also be partitioned (by specifyingthe :partitions option). If partitioning is required then a good default is toset the number of partitions to the number of schedulers available:

Registry, the open source implementation for storing and distributing containerimages and other content, has been donated to the CNCF. Registry now goes underthe name of Distribution, and the documentation has moved todistribution/distribution.

The Docker Hub registry implementation is based on Distribution. Docker Hubimplements version 1.0.1 OCI distributionspecification. For referencedocumentation on the API protocol that Docker Hub implements, refer to the OCIdistribution specification.

Pennsylvania's General Assembly has determined public safety will be enhanced by making information about registered sexual offenders available to the public through the internet. Knowledge whether a person is a registered sexual offender could be a significant factor in protecting yourself, your family members, or persons in your care from recidivist acts by registered sexual offenders. Public access to information about registered sexual offenders is intended solely as a means of public protection, any other use prohibited. Pursuant 42 Pa.C.S. 9799.28 and 9799.63, the State Police has established this website to provide timely information to the public on registered sexual offenders who reside, or are transient, attend school, or are employed/carry on a vocation, within this Commonwealth.

Pennsylvania's Megan's Law, 42 Pa.C.S 9799.32(1) and 9799.67(1) , requires the State Police to create and maintain a registry of persons who reside, or is transient, work/carry on a vocation, or attend school in the Commonwealth and who have either been convicted of, entered a plea of guilty to, or have been adjudicated delinquent of Certain Sexual Offenses in Pennsylvania or another jurisdiction.

Any person who uses the information contained herein to threaten, intimidate, or harass the registrant or their family, or who otherwise misuses this information, may be subject to criminal prosecution or civil liability.

While DCJS cannot tell you if there are any Level 1 sex offenders or sex offenders with a pending risk level in your neighborhood or who they are, the agency can advise if a particular individual is on the registry.

Call 1-800-262-3257 with the name and at least one other identifier (an exact address, date of birth, driver's license number, or a social security number) to learn if that individual is a registered sex offender in New York. Photographs of Level 1 offenders also are provided upon request.

The Sex Offender Registry contains a variety of information about registered sex offenders, including but not limited to: multiple photos, names (aliases), home and/or work addresses, and convictions that required registration, if applicable.

Level 3 offenders and those offenders designated sexual predators must personally verify their address every 90 days with the police agency having jurisdiction where they live. If an offender's appearance has changed, police may photograph the offender and submit the update photo to the Registry.

The Sex Offender Registration Act requires the Division of Criminal Justice Services (DCJS) to maintain a Sex Offender Registry. Sex offenders are classified according to their risk of re-offending: low-risk (Level 1), moderate risk (Level 2) and high-risk (Level 3). The Act requires that DCJS also maintain a public Subdirectory on the internet which only includes Level 2 and 3 offenders. You are now on the public Subdirectory website.

DCJS attempts to ensure that the information in the Subdirectory is accurate and complete. However, the information on the Subdirectory is reported to DCJS by other sources. As a result, DCJS makes no express or implied guarantee concerning the accuracy or completeness of this data.

Please note that because of a law suit filed by The Legal Aid Society on behalf of some sex offenders, not all Level 2 and 3 offenders can be listed on this site at this time. However, even though an offender may not be listed on this site, information about the offender is available through DCJS's 800 # at 800-262-3257.

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