2022-03-11 07:38:57 +13:00
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[](https://maven-badges.herokuapp.com/maven-central/io.xpipe/beacon)
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[](https://javadoc.io/doc/io.xpipe/beacon)
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[](https://github.com/xpipe-io/xpipe_java/actions/workflows/beacon.yml)
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2022-03-09 11:30:13 +13:00
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## X-Pipe Beacon
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The X-Pipe beacon component is responsible for handling all communications between the X-Pipe daemon
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and the various programming language APIs and the CLI. It provides an API that supports all kinds
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of different operations.
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The underlying inter-process communication is realized through TCP sockets on port `21721`.
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The data structures and exchange protocols are specified in the `io.xpipe.beacon.exchange` package.
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Every exchange is initiated from the outside by sending a request message to the daemon.
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The daemon then always sends a response message.
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The header information of a message is formatted in the json format.
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As a result, all data structures exchanged must be serializable/deserializable with jackson.
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Both the requests and responses can optionally include content in a body.
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A body is initiated with two new lines (`\n`).
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The body is split into segments of max length `65536`.
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Each segment is preceded by four bytes that specify the length of the next segment.
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In case the next segment has a length of less than `65536` bytes, we know that the end of the body has been reached.
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This way the socket communication can handle payloads of unknown length.
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### Configuration
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The default port used by the beacon implementation of the X-Pipe daemon and APIs is `21721`.
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It can be changed by passing the property `io.xpipe.beacon.port=<port>` to both the daemon and APIs.
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The beacon API also supports launching the daemon automatically in case it is not started yet.
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By default, it launches the daemon of the local X-Pipe installation.
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It is possible to pass a custom launch command with the property `io.xpipe.beacon.exec=<cmd>`.
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This allows for a custom launch behaviour in a testing/development environment.
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By passing the property `io.xpipe.beacon.debugOutput=true`, it is possible to print debug information
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about the underlying communications.
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In case the `io.xpipe.beacon.exec` property is set, the output of the custom exec command can also be
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printed by passing the property `io.xpipe.beacon.debugExecOutput=true`.
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