JSON Example

In this example you store a JSON document in a GemFire cache and query the document.

Running the Example

Note: To run this example, you must have terminal sessions configured for the QuickStart examples, as described in Setting Up Your Environment for Running the Examples.

Open a terminal session and switch to the <Install_directory>/SampleCode/quickstart directory.

Run the following command:

gfsh start server --name=server_json --cache-xml-file=xml/Server.xml --classpath="$GEMFIRE/SampleCode/quickstart/classes"

Wait for the server to start.
Open a second terminal session and switch to the <Install_directory>/SampleCode/quickstart directory.

Run the following command:

java -cp "$GEMFIRE/SampleCode/quickstart/classes:$GEMFIRE/lib/server-dependencies.jar" quickstart.JSONClient

The client displays the following JSON document:

 {
          "firstName" : "John",
          "lastName" : "Smith",
          "age" : 25,
          "address" : {
            "streetAddress" : "21 2nd Street",
            "city" : "New York",
            "state" : "NY",
            "postalCode" : "10021"
          },
          "phoneNumber" : [ {
            "type" : "home",
            "number" : "212 555-1234"
          }, {
            "type" : "fax",
            "number" : "646 555-4567"
          } ]
        }

The client retrieves the JSON document, queries it, and displays the results.

Switch to the first session and stop the cache server using the following command:
```
gfsh stop server --dir=server_json
```

Example Source Files

Table 1. Cache configuration files, located in SampleCode/quickstart/xml
Server.xml	Configures a cache to serve caching clients. The example region also is configured with a loader.
JsonClient.xml	Configures a region as a client region in a client/server cache. The region's pool connects to a cacheserver listening on port 40404.

Table 2. Java program files, located in SampleCode/quickstart/quickstart
JSONClient.java	Creates a client that stores a JSON document in the cache and then queries the document.
SimpleCacheLoader.java	A very simple CacheLoader implementation

Related Topics
Adding JSON Documents to the GemFire Cache

Related Javadocs

com.gemstone.gemfire.pdx.JSONFormatter
com.gemstone.gemfire.pdx.PdxInstance