{"id":17407,"date":"2013-09-20T10:00:53","date_gmt":"2013-09-20T07:00:53","guid":{"rendered":"http:\/\/www.javacodegeeks.com\/?p=17407"},"modified":"2013-09-20T09:02:41","modified_gmt":"2013-09-20T06:02:41","slug":"exploring-apache-camel-core-file-component","status":"publish","type":"post","link":"https:\/\/www.javacodegeeks.com\/2013\/09\/exploring-apache-camel-core-file-component.html","title":{"rendered":"Exploring Apache Camel Core – File Component"},"content":{"rendered":"

A file poller is a very useful mechanism to solve common IT problems. Camel\u2019s built-in file<\/code> component is extremely flexible, and there are many options available for configuration. Let\u2019s cover few common usages here.<\/p>\n

Polling a directory for input files<\/h2>\n

Here is a typical Camel Route<\/code> used to poll a directory for input files on every second.
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import org.slf4j.*;\r\nimport org.apache.camel.*;\r\nimport org.apache.camel.builder.*;\r\nimport java.io.*;\r\n\r\npublic class FileRouteBuilder extends RouteBuilder {\r\n    static Logger LOG = LoggerFactory.getLogger(FileRouteBuilder.class);\r\n    public void configure() {\r\n        from(\"file:\/\/target\/input?delay=1000\")\r\n        .process(new Processor() {\r\n            public void process(Exchange msg) {\r\n                File file = msg.getIn().getBody(File.class);\r\n                LOG.info(\"Processing file: \" + file);\r\n            }\r\n        });\r\n    }\r\n}<\/pre>\n
Run this with following<\/p>\n
mvn compile exec:java -Dexec.mainClass=org.apache.camel.main.Main -Dexec.args='-r camelcoredemo.FileRouteBuilder'<\/pre>\n
The program will begin to poll your target\/input<\/code> folder under your current directory, and wait for incoming files. To test with input files, you would need to open another terminal, and then create some files as follow.<\/p>\n
echo 'Hello 1' > target\/input\/test1.txt\r\necho 'Hello 2' > target\/input\/test2.txt<\/pre>\n
You should now see the first prompt window start to picking up the files and pass to the next Processor<\/code> step. In the Processor<\/code>, we obtain the File<\/code> object from the message body. It then simply logs it\u2019s file name. You may hit CTRL+C<\/code> when you are done.<\/p>\n
There many configurable options from file<\/code> componet you may use in the URL, but most of the default settings are enough to get you going as simple case above. Some of these default behavior is such that if the input folder doesn\u2019t exists, it will create it. And when the file is done processing by the Route<\/code>, it will be moved into a .camel<\/code> folder. If you don\u2019t want the file at all after processing, then set delete=true<\/code> in the URL.<\/p>\n
Read in the file content and converting to different types<\/h2>\n
By default, the file<\/code> component will create a org.apache.camel.component.file.GenericFile<\/code> object for each file found and pass it down your Route<\/code> as message body. You may retrieve all your file information through this object. Or alternatively, you may also use the Exchange<\/code> API to auto convert the message body object to a type you expect to receive (eg: as with msg.getIn().getBody(File.class)<\/code>). In above example, the File<\/code> is a type you expect to get from the message body, and Camel hence will try to convert it for you. The Camel uses the context\u2019s registry space to pre-registered many TypeConverter<\/code>‘s that can handle most of the common data types (like Java primative etc) conversion. These TypeConverter<\/code>s<\/em> are powerful way to make your Route<\/code> and Processor<\/code> more flexbile and portable.
 
<\/div> <\/div><\/p>\n
Camel will not only convert just your File<\/code> object from message body, but it can also read the file content. If your files are character text based, then you can simply do this.<\/p>\n
from(\"file:\/\/target\/input?charset=UTF-8\")\r\n        .process(new Processor() {\r\n            public void process(Exchange msg) {\r\n                String text = msg.getIn().getBody(String.class);\r\n                LOG.info(\"Processing text: \" + text);\r\n            }\r\n        });<\/pre>\n
That\u2019s it! Simply specify String<\/code> type, and Camel will read your file in and pass the entire file text content as body message. You may even use the charset<\/code> to change the encoding.<\/p>\n
If you are dealing with binary file, then simply try byte[] bytes = msg.getIn().getBody(byte[].class);<\/code> conversion instead. Pretty cool huh?<\/p>\n
Polling and processing large files<\/h2>\n
When working with large files, there few options in file<\/code> componet that you might want to use to ensure proper handling. For example, you might want to move the input file into a staging<\/code> folder before the Route<\/code> starts the processing; and when it\u2019s done, move it to a .completed<\/code> folder.<\/p>\n
from(\"file:\/\/target\/input?preMove=staging&move=.completed\")\r\n        .process(new Processor() {\r\n            public void process(Exchange msg) {\r\n                File file = msg.getIn().getBody(File.class);\r\n                LOG.info(\"Processing file: \" + file);\r\n            }\r\n        });<\/pre>\n
To feed input files properly into the polling folder, it\u2019s best if the sender generates the input files in a temporary folder first, and only when it\u2019s ready then move it into the polling folder. This will minimize reading an incomplete file by the Route<\/code> if the input file might take times to generate. Also another solution to this is to config file<\/code> endpoint to only read the polling folder when there is a signal or ready marker file exists. For example:<\/p>\n
from(\"file:\/\/target\/input?preMove=staging&move=.completed&doneFileName=ReadyFile.txt\")\r\n        .process(new Processor() {\r\n            public void process(Exchange msg) {\r\n                File file = msg.getIn().getBody(File.class);\r\n                LOG.info(\"Processing file: \" + file);\r\n            }\r\n        });<\/pre>\n
Above will only read the target\/input<\/code> folder when there is a ReadyFile.txt<\/code> file exists. The marker file can be just an empty file, and it will be removed by Camel after polling. This solution would allow the sender to generate input files in however long time it might take.<\/p>\n
Another concern with large file processing is to avoid loading entire file content into memory for processing. To be more practical, you want to split the file into records (eg: per line) and process it one by one (or called “streaming”). Here is how you would do that using Camel.<\/p>\n
from(\"file:\/\/target\/input?preMove=staging&move=.completed\")\r\n        .split(body().tokenize(\"\\n\"))\r\n        .streaming()\r\n        .process(new Processor() {\r\n            public void process(Exchange msg) {\r\n                String line = msg.getIn().getBody(String.class);\r\n                LOG.info(\"Processing line: \" + line);\r\n            }\r\n        });<\/pre>\n
This Route<\/code> will allow you to process large size file without cosuming too much memory and process it line by line very efficiently.<\/p>\n
Writing messages back into file<\/h2>\n
The file<\/code> component can also be used to write messages into files. Recall that we may use dataset<\/code> component to generate sample messages. We will use that to feed the Route<\/code> and send to the file<\/code> component so you can see that each message generated will be saved into a file.<\/p>\n
package camelcoredemo;\r\n\r\nimport org.slf4j.*;\r\nimport org.apache.camel.*;\r\nimport org.apache.camel.builder.*;\r\nimport org.apache.camel.main.Main;\r\nimport org.apache.camel.component.dataset.*;\r\n\r\npublic class FileDemoCamel extends Main {\r\n    static Logger LOG = LoggerFactory.getLogger(FileDemoCamel.class);\r\n    public static void main(String[] args) throws Exception {\r\n        FileDemoCamel main = new FileDemoCamel();\r\n        main.enableHangupSupport();\r\n        main.addRouteBuilder(createRouteBuilder());\r\n        main.bind(\"sampleGenerator\", createDataSet());\r\n        main.run(args);\r\n    }\r\n    static RouteBuilder createRouteBuilder() {\r\n        return new RouteBuilder() {\r\n            public void configure() {\r\n                from(\"dataset:\/\/sampleGenerator\")\r\n                .to(\"file:\/\/target\/output\");\r\n            }\r\n        };\r\n    }\r\n    static DataSet createDataSet() {\r\n        return new SimpleDataSet();\r\n    }\r\n}<\/pre>\n
Compile and run it<\/p>\n
mvn compile exec:java -Dexec.mainClass=camelcoredemo.FileDemoCamel<\/pre>\n
Upon complete you will see that 10 files would be generated in target\/output<\/code> folder with file name in ID-<hostname>-<unique-number>-<msg-seq-num><\/code> format.<\/p>\n
There are more options availabe from File<\/a> component that you may explore. Try it out with a Route<\/a> and see it for yourself.
\n <\/p>\n
Reference: <\/i><\/b>Exploring Apache Camel Core – File Component<\/a> from our JCG partner<\/a> Zemian Deng at the A Programmer’s Journal<\/a> blog.<\/div>\n","protected":false},"excerpt":{"rendered":"
A file poller is a very useful mechanism to solve common IT problems. Camel\u2019s built-in file component is extremely flexible, and there are many options available for configuration. Let\u2019s cover few common usages here. Polling a directory for input files Here is a typical Camel Route used to poll a directory for input files on …<\/p>\n","protected":false},"author":267,"featured_media":52,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8],"tags":[357],"class_list":["post-17407","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-enterprise-java","tag-apache-camel"],"yoast_head":"\nExploring Apache Camel Core - File Component<\/title>\n<meta name=\"description\" content=\"A file poller is a very useful mechanism to solve common IT problems. 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