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package org.apache.thrift;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import org.apache.hc.core5.http.ClassicHttpResponse;
import org.apache.hc.core5.http.HttpEntity;
import org.apache.hc.core5.http.HttpException;
import org.apache.hc.core5.http.HttpStatus;
import org.apache.hc.core5.http.io.HttpClientResponseHandler;
public class THttpClientResponseHandler implements HttpClientResponseHandler<InputStream> {
@Override
public InputStream handleResponse(ClassicHttpResponse response)
throws HttpException, IOException {
try (InputStream is = response.getEntity().getContent()) {
int responseCode = response.getCode();
if (responseCode != HttpStatus.SC_OK) {
throw new IOException("HTTP Response code: " + responseCode);
}
byte[] readByteArray = readIntoByteArray(is);
try {
// Indicate we're done with the content.
consume(response.getEntity());
} catch (IOException ioe) {
// We ignore this exception, it might only mean the server has no
// keep-alive capability.
}
return new ByteArrayInputStream(readByteArray);
} catch (IOException ioe) {
throw ioe;
}
}
/**
* Read the responses into a byte array so we can release the connection early. This implies that
* the whole content will have to be read in memory, and that momentarily we might use up twice
* the memory (while the thrift struct is being read up the chain). Proceeding differently might
* lead to exhaustion of connections and thus to app failure.
*
* @param is input stream
* @return read bytes
* @throws IOException when exception during read
*/
private static byte[] readIntoByteArray(InputStream is) throws IOException {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
byte[] buf = new byte[1024];
int len;
do {
len = is.read(buf);
if (len > 0) {
baos.write(buf, 0, len);
}
} while (-1 != len);
return baos.toByteArray();
}
/**
* copy from org.apache.http.util.EntityUtils#consume. Android has it's own httpcore that doesn't
* have a consume.
*/
private static void consume(final HttpEntity entity) throws IOException {
if (entity == null) {
return;
}
if (entity.isStreaming()) {
InputStream instream = entity.getContent();
if (instream != null) {
instream.close();
}
}
}
}
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