THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
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Input
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and
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Output
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Stream
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Adapters
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The
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Apache
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Wink
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Client
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provides
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the
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ability
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to
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manipulate
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raw
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Http
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input
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and
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output
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entity
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streams
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through
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the
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InputStreamAdapter
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and
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the
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OutputStreamAdapter
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interfaces.
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This
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is
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useful
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for
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modifying
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the
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input
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and
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output
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streams,
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regardless
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of
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the
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actual
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entity,
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for
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example
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when
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adding
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compression
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capabilities.
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The
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adapt()
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method
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of
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the
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output
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stream
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adapter
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is
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called
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before
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the
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request
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headers
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are
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committed,
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in
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order
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to
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allow
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the
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adapter
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to
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manipulate
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them.
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The
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adapt()
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method
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of
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the
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input
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stream
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adapter
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is
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called
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after
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the
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response
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status
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code
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and
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the
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headers
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are
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received
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in
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order
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to
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allow
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the
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adapter
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to
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behave
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accordingly.
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Stream
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Adapters
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Example
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The
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following
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example
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demonstrates
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how
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to
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implement
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input
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and
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output adapters.
Gzip Handler
The following code snippet is an example of adding a input and output adapters in the Gzip handler.
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public adapters. h4. Gzip Handlerpublic class GzipHandler implements ClientHandler { public ClientResponse handle(ClientRequest request, HandlerContext context) { request.getHeaders().add("Accept-Encoding", "gzip"); context.addInputStreamAdapter(new GzipInputAdapter()); context.addOutputStreamAdapter(new GzipOutputAdapter()); return context.doChain(request); }} |
Explanation
The Gzip handler creates instances of the GzipInputAdapter and the GzipOutputAdapter and adds them to the stream adapters of the current request by invoking the addInputStreamAdapter() method and the addOutputStreamAdapter() method on the HandlerContext instance.
Gzip Input Stream Adapter
The following code snippet is an example of an implementation of a Gzip input stream adapter.
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class h4. Gzip Input Stream Adapterclass GzipInputAdapter implements InputStreamAdapter{ public InputStream adapt(InputStream is, ClientResponse response) { String header = response.getHeaders().getFirst("Content-Encoding"); if (header != null && header.equalsIgnoreCase("gzip")) { return new GZIPInputStream(is); } return is; }} h4. Gzip Output |
Explanation
The Gzip input stream adapter is responsible for wrapping the input stream with the Gzip input stream.
Gzip Output Stream Adapter
The following code snippet is an example of an implementation of a Gzip output stream adapter.
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class Stream Adapterclass GzipOutputAdapter implements OutputStreamAdapter { public OutputStream adapt(OutputStream os, ClientRequest request) { request.getHeaders().add("Content-Encoding", "gzip"); return new GZIPOutputStream(os); }} h4. Explanation The Gzip handler creates instances of the GzipInputAdapter and the GzipOutputAdapter and adds them to the stream adapters of the current request by invoking the addInputStreamAdapter() and addOutputStreamAdapter() on the HandlerContext instance |
Explanation
The Gzip output stream adapter is responsible for wrapping the output stream with the Gzip output stream.