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/**
* Author: Sven Gothel <sgothel@jausoft.com>
* Copyright (c) 2022 Gothel Software e.K.
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
package org.jau.io;
import java.nio.ByteBuffer;
/**
* Ringbuffer-Based byte input stream with an externally provisioned data feed.
*
* Instance uses the native C++ object `jau::io::ByteInStream_Feed`.
*/
public final class ByteInStream_Feed implements ByteInStream {
private volatile long nativeInstance;
/* pp */ long getNativeInstance() { return nativeInstance; }
/**
* Construct a ringbuffer backed externally provisioned byte input stream
* @param id_name arbitrary identifier for this instance
* @param timeoutMS maximum duration in milliseconds to wait @ check_available() and write(), zero waits infinitely
*/
public ByteInStream_Feed(final String id_name, final long timeoutMS) {
try {
nativeInstance = ctorImpl(id_name, timeoutMS);
} catch (final Throwable t) {
System.err.println("ByteInStream_Feed.ctor: native ctor failed: "+t.getMessage());
throw t;
}
}
private native long ctorImpl(final String id_name, final long timeoutMS);
@Override
public native void closeStream();
@Override
public void close() {
final long handle;
synchronized( this ) {
handle = nativeInstance;
nativeInstance = 0;
}
if( 0 != handle ) {
dtorImpl(handle);
}
}
private static native void dtorImpl(final long nativeInstance);
@Override
public void finalize() {
close();
}
@Override
public native boolean is_open();
@Override
public void clear(final IOState state) {
clearImpl( state.mask );
}
private native void clearImpl(int s);
@Override
public IOState rdState() {
return new IOState( rdStateImpl() );
}
private native int rdStateImpl();
@Override
public void setState(final IOState state) {
setStateImpl( state.mask );
}
private native void setStateImpl(int s);
@Override
public native boolean good();
@Override
public native boolean eof();
@Override
public native boolean fail();
@Override
public native boolean bad();
@Override
public boolean end_of_data() { return !good(); }
@Override
public native boolean available(final long n);
@Override
public native int read(final byte[] out, final int offset, final int length);
@Override
public int read(final ByteBuffer out) {
if( !Buffers.isDirect(out) ) {
throw new IllegalArgumentException("out buffer not direct");
}
final int res = read2Impl(out, (int)Buffers.getDirectBufferByteOffset(out));
out.limit(out.position() + res);
return res;
}
private native int read2Impl(Object out, int out_offset);
@Override
public native int peek(byte[] out, final int offset, final int length, final long peek_offset);
@Override
public native String id();
@Override
public native long discard_next(long N);
@Override
public native long tellg();
@Override
public native boolean has_content_size();
@Override
public native long content_size();
/**
* Interrupt a potentially blocked reader.
*
* Call this method if intended to abort streaming and to interrupt the reader thread's potentially blocked check_available() call,
* i.e. done at set_eof()
*
* @see set_eof()
*/
public native void interruptReader();
/**
* Write given bytes to the async ringbuffer.
*
* Wait up to timeout duration given in constructor until ringbuffer space is available, where fractions_i64::zero waits infinitely.
*
* This method is blocking.
*
* @param in the byte array to transfer to the async ringbuffer
* @param offset offset to in byte array to write
* @param length number of in bytes to write starting at offset
*/
public native void write(final byte[] in, final int offset, final int length);
/**
* Write given bytes to the async ringbuffer.
*
* Wait up to timeout duration given in constructor until ringbuffer space is available, where fractions_i64::zero waits infinitely.
*
* This method is blocking.
*
* @param in the direct {@link ByteBuffer} to transfer to the async ringbuffer starting at its {@link ByteBuffer#position() position} up to its {@link ByteBuffer#limit() limit}.
* {@link ByteBuffer#limit() Limit} will be reset to {@link ByteBuffer#position() position}.
*/
public void write(final ByteBuffer in) {
if( !Buffers.isDirect(in) ) {
throw new IllegalArgumentException("out buffer not direct");
}
write2Impl(in, (int)Buffers.getDirectBufferByteOffset(in), in.limit());
in.limit(in.position());
}
private native void write2Impl(ByteBuffer out, int out_offset, int out_limit);
/**
* Set known content size, informal only.
* @param content_length the content size in bytes
*/
public native void set_content_size(final long size);
/**
* Set end-of-data (EOS), i.e. when feeder completed provisioning bytes.
*
* Implementation issues interruptReader() to unblock a potentially blocked reader thread.
*
* @param result should be either -1 for FAILED or 1 for SUCCESS.
*
* @see interruptReader()
*/
public native void set_eof(final int result);
@Override
public native String toString();
}
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