org.apache.ignite.marshaller

## Interface Marshaller

All Known Implementing Classes:
  AbstractMarshaller, AbstractNodeNameAwareMarshaller, BinaryMarshaller, JdkMarshaller, OptimizedMarshaller

    public interface Marshaller

`Marshaller` allows to marshal or unmarshal objects in grid. It provides serialization/deserialization mechanism for all instances that are sent across networks or are otherwise serialized.

Ignite provides the following `Marshaller` implementations:

- Default binary marshaller. Will be used when no other marshaller is explicitly set to the configuration. For more information, see `IgniteBinary`.
- `JdkMarshaller`

Below are examples of marshaller configuration, usage, and injection into tasks, jobs, and SPI's.

## Java Example

`Marshaller` can be explicitly configured in code.

     JdkMarshaller marshaller = new JdkMarshaller();

     IgniteConfiguration cfg = new IgniteConfiguration();

     // Override marshaller.
     cfg.setMarshaller(marshaller);

     // Starts grid.
     G.start(cfg);

## Spring Example

Marshaller can be configured from Spring XML configuration file:

     <bean id="grid.custom.cfg" class="org.apache.ignite.configuration.IgniteConfiguration" singleton="true">
         ...
         <property name="marshaller">
             <bean class="org.apache.ignite.marshaller.jdk.JdkMarshaller"/>
         </property>
         ...
     </bean>

For information about Spring framework visit www.springframework.org

### Method Summary

All Methods Instance Methods Abstract Methods
`byte[]` `marshal(@Nullable Object obj)` Marshals object to byte array.
`void` `marshal(@Nullable Object obj, OutputStream out)` Marshals object to the output stream.
`void` `setContext(MarshallerContext ctx)` Sets marshaller context.
`<T> T` `unmarshal(byte[] arr, @Nullable ClassLoader clsLdr)` Unmarshals object from byte array using given class loader.
`<T> T` `unmarshal(InputStream in, @Nullable ClassLoader clsLdr)` Unmarshals object from the input stream using given class loader.

### Method Detail

#### setContext

    void setContext(MarshallerContext ctx)

Sets marshaller context.

Parameters:
  `ctx` - Marshaller context.

#### marshal

    void marshal(@Nullable
                 @Nullable Object obj,
                 OutputStream out)
          throws IgniteCheckedException

Marshals object to the output stream. This method should not close given output stream.

Parameters:
  `obj` - Object to marshal. `null` object will be marshaled to binary `null` representation.
  `out` - Output stream to marshal into.
Throws:
  `IgniteCheckedException` - If marshalling failed.

#### marshal

    byte[] marshal(@Nullable
                   @Nullable Object obj)
            throws IgniteCheckedException

Marshals object to byte array.

Parameters:
  `obj` - Object to marshal. `null` object will be marshaled to binary `null` representation.
Returns:
  Byte array.
Throws:
  `IgniteCheckedException` - If marshalling failed.

#### unmarshal

    <T> T unmarshal(InputStream in,
                    @Nullable
                    @Nullable ClassLoader clsLdr)
             throws IgniteCheckedException

Unmarshals object from the input stream using given class loader. This method should not close given input stream.

Type Parameters:
  `T` - Type of unmarshalled object.
Parameters:
  `in` - Input stream.
  `clsLdr` - If not `null` then given class loader will be used for unmarshal object.
Returns:
  Unmarshalled object.
Throws:
  `IgniteCheckedException` - If unmarshalling failed.

#### unmarshal

    <T> T unmarshal(byte[] arr,
                    @Nullable
                    @Nullable ClassLoader clsLdr)
             throws IgniteCheckedException

Unmarshals object from byte array using given class loader.

Type Parameters:
  `T` - Type of unmarshalled object.
Parameters:
  `arr` - Byte array.
  `clsLdr` - If not `null` then given class loader will be used for unmarshal object.
Returns:
  Unmarshalled object.
Throws:
  `IgniteCheckedException` - If unmarshalling failed.

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Ignite Database and Caching Platform | : ver. 2.12.0
Release Date | : January 10 2022