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//
// ========================================================================
// Copyright (c) 1995 Mort Bay Consulting Pty Ltd and others.
//
// This program and the accompanying materials are made available under the
// terms of the Eclipse Public License v. 2.0 which is available at
// https://www.eclipse.org/legal/epl-2.0, or the Apache License, Version 2.0
// which is available at https://www.apache.org/licenses/LICENSE-2.0.
//
// SPDX-License-Identifier: EPL-2.0 OR Apache-2.0
// ========================================================================
//

package org.eclipse.jetty.io.content;

import java.io.IOException;
import java.io.InputStream;
import java.nio.ByteBuffer;
import java.util.Objects;

import org.eclipse.jetty.io.ByteBufferPool;
import org.eclipse.jetty.io.Content;
import org.eclipse.jetty.io.RetainableByteBuffer;
import org.eclipse.jetty.util.IO;
import org.eclipse.jetty.util.thread.AutoLock;
import org.eclipse.jetty.util.thread.SerializedInvoker;

/**
 * 

* A {@link Content.Source} that is backed by an {@link InputStream}. * Data is read from the {@link InputStream} into a buffer that is optionally acquired * from a {@link ByteBufferPool}, and converted to a {@link Content.Chunk} that is * returned from {@link #read()}. If no {@link ByteBufferPool} is provided, then * a {@link ByteBufferPool.NonPooling} is used. *

*/ public class InputStreamContentSource implements Content.Source { private final AutoLock lock = new AutoLock(); private final SerializedInvoker invoker = new SerializedInvoker(); private final InputStream inputStream; private final ByteBufferPool bufferPool; private int bufferSize = 4096; private boolean useDirectByteBuffers; private Runnable demandCallback; private Content.Chunk errorChunk; private boolean closed; public InputStreamContentSource(InputStream inputStream) { this(inputStream, null); } public InputStreamContentSource(InputStream inputStream, ByteBufferPool bufferPool) { this.inputStream = Objects.requireNonNull(inputStream); this.bufferPool = bufferPool != null ? bufferPool : ByteBufferPool.NON_POOLING; } public int getBufferSize() { return bufferSize; } public void setBufferSize(int bufferSize) { this.bufferSize = bufferSize; } public boolean isUseDirectByteBuffers() { return useDirectByteBuffers; } public void setUseDirectByteBuffers(boolean useDirectByteBuffers) { this.useDirectByteBuffers = useDirectByteBuffers; } @Override public Content.Chunk read() { try (AutoLock ignored = lock.lock()) { if (errorChunk != null) return errorChunk; if (closed) return Content.Chunk.EOF; } RetainableByteBuffer streamBuffer = bufferPool.acquire(getBufferSize(), useDirectByteBuffers); try { ByteBuffer buffer = streamBuffer.getByteBuffer(); int read = fillBufferFromInputStream(inputStream, buffer.array()); if (read < 0) { streamBuffer.release(); close(); return Content.Chunk.EOF; } else { buffer.limit(read); return Content.Chunk.asChunk(buffer, false, streamBuffer); } } catch (Throwable x) { streamBuffer.release(); return failure(x); } } protected int fillBufferFromInputStream(InputStream inputStream, byte[] buffer) throws IOException { return inputStream.read(buffer, 0, buffer.length); } private void close() { try (AutoLock ignored = lock.lock()) { closed = true; } IO.close(inputStream); } @Override public void demand(Runnable demandCallback) { try (AutoLock ignored = lock.lock()) { if (this.demandCallback != null) throw new IllegalStateException("demand pending"); this.demandCallback = demandCallback; } invoker.run(this::invokeDemandCallback); } private void invokeDemandCallback() { Runnable demandCallback; try (AutoLock ignored = lock.lock()) { demandCallback = this.demandCallback; this.demandCallback = null; } if (demandCallback != null) runDemandCallback(demandCallback); } private void runDemandCallback(Runnable demandCallback) { try { demandCallback.run(); } catch (Throwable x) { fail(x); } } @Override public void fail(Throwable failure) { failure(failure); } private Content.Chunk failure(Throwable failure) { Content.Chunk error; try (AutoLock ignored = lock.lock()) { error = errorChunk; if (error == null) error = errorChunk = Content.Chunk.from(failure); } IO.close(inputStream); return error; } }




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