Analytics Vasiliki (Vasia) Kalavri
 vkalavri@bu.edu Spring 2020 1/28: Stream ingestion and pub/sub systems Streaming sources Files, e.g. transaction logs Sockets IoT devices and sensors Databases notify unsubscribe advertise(): information reg. future events Publish/Subscribe Systems 17 Pub/Sub levels of de-coupling • Space: interacting parties do not need to know each other • Publishers Decoupling Message-passing RPC/RMI Asynchronous RPC Futures Message Queues Pub/Sub Yes Yes Yes Can you fill this in? 19 Pub/Sub vs. other paradigms Paradigm Space Decoupling Time Decoupling Synchronization

raised. 1.1.6. Path Matching The Servlet API exposes the full request path as requestURI and further sub-divides it into contextPath, servletPath, and pathInfo whose values vary depending on how a Servlet attributes and sub-elements of . You can view the Spring MVC XML schema or use the code completion feature of your IDE to discover what attributes 175 and sub-elements are available encoded resources) and VersionResourceResolver, you must register them in this order. That ensures content-based versions are always computed reliably, based on the unencoded file. For WebJars, versioned URLs

order-execute architecture can be found in virtually all existing blockchain systems, ranging from pub- lic/permissionless platforms such as Ethereum (with PoW-based consensus) to permissioned platforms • cryptogen, • idemixgen • orderer, • peer, and • fabric-ca-client and places them in the bin sub-directory of the current working directory. You may want to add that to your PATH environment variable play either within the scope of the organization the MSP represents (e.g., admins, or as members of a sub-organization group), and sets the basis for defining access privileges in the context of a network

configtxlator, cryptogen, idemixgen orderer, peer, and fabric-ca-client and places them in the bin sub-directory of the current working directory. You may want to add that to your PATH environment variable play either within the scope of the organization the MSP represents (e.g., admins, or as members of a sub-organization group), and sets the basis for defining access privileges in the context of a network first-network sample. Let’s open that sub- directory now. cd fabric-samples/first-network Note The supplied commands in this documentation MUST be run from your first- network sub-directory of the fabric-samples

order-execute architecture can be found in virtually all existing blockchain systems, ranging from pub- lic/permissionless platforms such as Ethereum (with PoW-based consensus) to permissioned platforms play either within the scope of the organization the MSP represents (e.g., admins, or as members of a sub-organization group), and sets the basis for defining access privileges in the context of a network • discover, • idemixgen • orderer, • peer, and • fabric-ca-client and places them in the bin sub-directory of the current working directory. You may want to add that to your PATH environment variable

play either within the scope of the organization the MSP represents (e.g., admins, or as members of a sub-organization group), and sets the basis for defining access privileges in the context of a network configtxlator, cryptogen, discover, idemixgen orderer, peer, and fabric-ca-client and places them in the bin sub-directory of the current working directory. You may want to add that to your PATH environment variable first-network sample. Let’s open that sub- directory now. cd fabric-samples/first-network Note The supplied commands in this documentation MUST be run from your first- network sub-directory of the fabric-samples

special redirect: prefix in a view name lets you perform a redirect. The UrlBasedViewResolver (and sub-classes) recognize this as an instruction that a redirect is needed. The rest of the view name is mapping attributes with custom request matching logic. This is a more advanced option that requires sub-classing RequestMappingHandlerMapping and overriding the getCustomMethodCondition method, where you Brotli encoded) and VersionedResourceResolver, they must be registered in that order, to ensure content-based versions are always computed reliably based on the unencoded file. For WebJars, versioned URLs

order-execute architecture can be found in virtually all existing blockchain systems, ranging from pub- lic/permissionless platforms such as Ethereum (with PoW-based consensus) to permissioned platforms play either within the scope of the organization the MSP represents (e.g., admins, or as members of a sub-organization group), and sets the basis for defining access privileges in the context of a network • discover, • idemixgen • orderer, • peer, and • fabric-ca-client and places them in the bin sub-directory of the current working directory. You may want to add that to your PATH environment variable

elements that render the functionality we’ve described so far. A local MSP folder contains the following sub-folders: The figure above shows the subfolders in a local MSP on the file system config.yaml: Used discover, idemixgen, orderer, peer, fabric-ca-client, fabric-ca-server and places them in the bin sub-directory of the current working directory. You may want to add that to your PATH environment variable topic you’ve understood how to implement the smart contract for PaperNet. You can move to the next sub topic to see how an application calls the smart contract using the Fabric SDK. Application Audience:

elements that render the functionality we’ve described so far. A local MSP folder contains the following sub-folders: The figure above shows the subfolders in a local MSP on the file system config.yaml: Used discover, idemixgen, orderer, peer, fabric-ca-client, fabric-ca-server and places them in the bin sub-directory of the current working directory. You may want to add that to your PATH environment variable topic you’ve understood how to implement the smart contract for PaperNet. You can move to the next sub topic to see how an application calls the smart contract using the Fabric SDK. Application Audience: