Please make sure to report any issues with these packages to the relevant maintainers. Both of the above options manage via sbt a specific scala version per scala project you create. Any other request for the page will be redirected with a lift error notice of. Its a very easy problem, yet theres a bunch of projects on github all hoping to do better than the previous one. Simple examples a list of simple scala snippets, useful to understand some basics of the language, as well as to see what scala code looks like. The following commands are used to compile and execute this program. Maingenericrunner btw, in java, you can tilt the slashes forward for convenience, and the vm understands. Ive solve this problem, but am struggling with the verbosity of the result. Please note that the json support is done by specifically using the json4s library and not through the internal support that dispatch library has for json am yet to figure that one out. This blog post explains its motivations and core design tenets, the finagle readme contains more detailed documentation.
In this article we will describe different approaches to load configurations in scala and how they can be combined together. If you dont have it installed, download java from oracle java 8, oracle java 11, or adoptopenjdk 811. In the mean time i have resorted to dispatch to access this webservice. This is the third post in the learning scala series after all. Below is a simple program showing how to write files in scala. To write a spark application, you need to add a dependency on spark. Configure the underlying asyncclient to follow redirects. I have an image on a server that, when requested, redirects to a signed s3 file, which then again redirects to the real file. Scl744 unpickling of some scala fails causing there contents to be treated as the java in the. For example, open the scala repl shell and execute the code as scala is a functional programming language scala expression can be evaluated in the tag value using curly braces. Headers whose names match sensitiveheaderfilter are not exposed when redirecting to a different authority. We assume that you are familiar with scala if not, may we recommend scala school. How do i use scala dispatch to get the url returned in a 301 redirect.
Actions, controllers and results what is an action. Most of the requests received by a play application are handled by an action a play. After creating the include servlet, add the following code between the body in. Play provides a range of abstractions for routing requests to actions, providing routers and filters to allow most common needs. You can help the ruby on rails community by adding new notes. Scala is open to make use of any java objects and java. Oauth is a simple way to publish and interact with protected data. In the following example, were matching just on ajax post requests, and returning. November 03, 2015 scala security frameworks functional programming. Dealing with annoying java library issues overriding the accesscontrol, contentlength, contenttransferencoding, host, keepalive, origin, trailer, transferencoding, upgrade, via headers.
This is quite commonplace in scala and can be observed when using java reflection with a number of scala features, e. If you use requests scala and like it, please support it by donating to our patreon. Sorry to keep you waiting for so long before showing some code. In our continuous effort to improve and make our software more secure, weve been exploring some of the security features found in the most popular scala frameworks. It uses many functional features of the scala and integrates very well into the language. It provides a scala vocabulary for javas asyncclient. Weve made a request that will fail the ok test with a redirect status code, but this. We assume that you are familiar with scala if not, may we recommend scala school the entire example is available, together with a selfcontained script to. You can find the scala cookbook at these locations.
Requestsscala aims to provide the same api and userexperience as the original requests. Resolve scala errors with max efficiency, not max effort improve workflow with a full view of releases so you can mark errors as resolved and prioritize live issues. Nevertheless, none of them come close to the ease and weightlessness of using kenneth reitzs requests library. Requests scala aims to provide the same api and userexperience as the original requests.
Dec 22, 2008 in essence, the scala compiler is stitching together the xml object message into a single scala. From a security pointofview, play 2 provides a security trait that can be used to create secure actions if you need more advanced security options, youre encouraged to use the authentication and authorization and the authenticity token modules, the deadbolt 2 plugin, secure social, silhouette or the. Play provides a simple filter api for applying global filters to each request. Jun 15, 2014 how to make rest service calls in scala. Browse other questions tagged scala statuscode301 redirect scala dispatch or ask your own question. Result function that handles a request and generates a result to be sent to the client. Finagle aims to make it easy to build robust clients and servers. See dispatchreboot for the modern dispatch for scala 2. Due to these implementations following redirects without trust checks, we force the urlconnection implementations not to follow redirects.
The following is an example program to writing to a file. See that page for a full list of examples, but for my own use, here are a few of them. The article assumes some basic scala knowledge, but even if you dont know scala i dont think it will not be too hard to follow along anyway. Compared to other programming languages, installing scala is a bit unusual. Akka has both a scala api actors scala and a java api actors java. Use the following properties in nf to configure the ws client.
How do i use scala dispatch to get the url returned in a. Our test suite is also run against java 11 in travis. Java developers are quickly moving to scala, because its easier and faster to write, but compiles into javacompatible byte code. If you write applications in scala, you will need to use a compatible scala version e. You want to run an external command and get access to both its stdout and stderr in a scala application solution. Scala is unusual because it is usually installed for each of your scala projects rather than being installed systemwide. How to convert json data to strongly typed objects. Scala working with rest service calls and handling json. First, make sure you have the java 8 jdk or java 11 jdk installed. However you can direct the request to a different action by invoking that action directly from the filter, though be aware that this will bypass the rest of the filter. Its been the jvm language of choice, leaving groovy and kotlin way behind, and is preferred as the language people want to write the most code in.
The pipeline diagrams mentioned at the start of this chapter are a useful guide to these stages. Thus, the scala compiler often creates synthetic classes i. Thirdparty packages may not provide the latest version. For quick parsing or where a predefined structure is not available, you can parse specific fields. Since we are using futures, the environment can handle more requests at the same time and the code is easier to read than a complex threading system. From the creators of play, get technology enhancements, monitoring, and expert support with akka platform from lightbend. File is one of the objects which can be used in scala programming to read and write files. This tutorial is sponsored by the scala cookbook, which i wrote for oreilly. If client side policy dictates that we follow redirects, trust decisions are placed before each retransmit. Able to handle lots of shortlived connections, can follow redirects and maybe with some sort of throttling mechanism.
On a redirect, any authorization information dynamically acquired by a basicauth userpass supplier is removed before being retransmitted, as it may no longer be applicable to the new url to which the connection is redirected. They correspond directly to the fundamental actions that together cover the essence of programming in scala compose match group recurse abstract aggregate mutate as always. In this article we will only look at the scala api since that is the most expressive one. This means that any code following the redirect is skipped. Version control, project management, deployments and your group chat in one place. See dispatch reboot for the modern dispatch for scala 2. It is excruciatingly slow, and does not work after 50 or so connections. Some of the headers are locked by the java library for security reasons and the behavior is that the library will just silently fail to set them.
Version 2 is simple enough to be implemented easily without library or helpers, so play only provides. Scl794 new file created on every processdeclaration in sbt files. If you also have java source, you can follow the same steps as for the java plugin to ensure the correct java compiler is used. Sometimes however an application will have more advanced needs that arent met by plays abstractions. The separation of configuration from code is a good practice that makes our system customisable as we can load different configurations according to the environment we are running it in. The play framework is one of the most frequently used web frameworks in scala. I dont know if akka client does not follow the redirect or if it is similar to this old spay issue.
Refer jdk compatibility for scala java compatiblity detail. You want to run an external command and get access to both its stdout and stderr in a scala application. Sequential composition, concurrent composition, composition example. Flowdock is a collaboration tool for technical teams. For example, it can be used to access your users data on twitter. Filters wrap the action after the action has been looked up by the router.
Scl535 follow up refactoring after pr about unnecessary parentheses. Elem hi,reena a brace escape can include arbitrary scala content including xml literals. For more info, see the dispatch documentation site. Apache cxf alvin alexander java, scala, unix, perl, mac os x. This is a fully featured client for scala which wraps. These examples are extracted from open source projects. Scala the simple parts before discussing library modules, lets start with the simple parts in the language itself. For example, it can be used to access your users data on twitter there are two very different versions of oauth. This is an excerpt from the scala cookbook partially modified for the internet. This is split into both stateless and stateful dispatch, and will be covered in more detail in.
Configures the client to follow 301 and 302 redirects default is true. This means you cannot use a filter to transform a path, method or query parameter to impact the router. Learn in which version a bug first appeared, merge duplicates, and know if things regress in a future release. With scala installed and some tools to work with it its about time to look at how we can execute scala code. Contribute to dispatchreboot development by creating an account on github. In essence, the scala compiler is stitching together the xml object message into a single scala.
Dont downplay this in a very real way, this is a powerful separation of presentation from logic that takes place entirely inside of one class. An alternative for the request dispatcher is send redirect. Scala standard library doesnt contain any classes to write files, so we will use java io classes for scala write to file. Im not sure here but is the quoting of the classpath correct. Where the actual redirect handling code should live.
Scala xml processing literals, serialization, parsing. How to handle the stdout and stderr of external commands. Its also a safer and more secure way for people to give you access. Scala is like python, but as fast as java, and allows you to use existing java libraries. Play framework the high velocity web framework for java and scala. Just a quick note here today that if you want to create a twitter client in scala, the java twitter4j library looks like a good path to take ive shown an example below, where you can see that besides the eight lines of code it takes to create a scala twitter object, the actual code you need to get information from the twitter developer api is pretty short. By default dispatch does not follow these redirects. The hooks in liftsession allow you to insert code at various points in the session life cycle. Node, then turning that into a string when passed into the print method of the responses writer. To use scala with salesforce, you use the rest api, which allows you to access any object within salesforce and.
The entire example is available, together with a selfcontained script to launch sbt, in the finagle git repository. Scala has emerged as one the most powerful java alternatives in recent times. Scala has many strong points, the strongest being that its a multiparadigm language. Integrating with salesforce using scala developer force blog. By default, this library will not follow redirects.
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