Refactor input stream support (fixes #1257) (#1268)

common/src/main/java/org/mvndaemon/mvnd/common/Message.java

@@ -1054,30 +1054,38 @@ public abstract class Message {
     public static class RequestInput extends Message {
 
         private String projectId;
+        private int bytesToRead;
 
         public static RequestInput read(DataInputStream input) throws IOException {
             String projectId = readUTF(input);
-            return new RequestInput(projectId);
+            int bytesToRead = input.readInt();
+            return new RequestInput(projectId, bytesToRead);
         }
 
-        public RequestInput(String projectId) {
+        public RequestInput(String projectId, int bytesToRead) {
             super(REQUEST_INPUT);
             this.projectId = projectId;
+            this.bytesToRead = bytesToRead;
         }
 
         public String getProjectId() {
             return projectId;
         }
 
+        public int getBytesToRead() {
+            return bytesToRead;
+        }
+
         @Override
         public String toString() {
-            return "RequestInput{" + "projectId='" + projectId + '\'' + '}';
+            return "RequestInput{" + "projectId='" + projectId + '\'' + ", bytesToRead=" + bytesToRead + '}';
         }
 
         @Override
         public void write(DataOutputStream output) throws IOException {
             super.write(output);
             writeUTF(output, projectId);
+            output.writeInt(bytesToRead);
         }
     }
 
@@ -1099,9 +1107,13 @@ public abstract class Message {
             return data;
         }
 
+        public boolean isEof() {
+            return data == null;
+        }
+
         @Override
         public String toString() {
-            return "InputResponse{" + "data='" + data + "\'" + '}';
+            return "InputResponse{" + (data == null ? "eof" : "data='" + data + "'") + '}';
         }
 
         @Override
@@ -1119,14 +1131,18 @@ public abstract class Message {
         return new StringMessage(BUILD_STATUS, payload);
     }
 
-    public static RequestInput requestInput(String projectId) {
-        return new RequestInput(projectId);
+    public static RequestInput requestInput(String projectId, int bytesToRead) {
+        return new RequestInput(projectId, bytesToRead);
     }
 
     public static InputData inputResponse(String data) {
         return new InputData(data);
     }
 
+    public static InputData inputEof() {
+        return new InputData(null);
+    }
+
     public static StringMessage out(String message) {
         return new StringMessage(PRINT_OUT, message);
     }

common/src/main/java/org/mvndaemon/mvnd/common/logging/TerminalInputHandler.java

@@ -0,0 +1,244 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.mvndaemon.mvnd.common.logging;
+
+import java.io.IOException;
+import java.util.concurrent.BlockingQueue;
+import java.util.concurrent.LinkedBlockingQueue;
+import java.util.concurrent.TimeUnit;
+import java.util.function.Consumer;
+
+import org.jline.terminal.Terminal;
+import org.mvndaemon.mvnd.common.Message;
+
+/**
+ * Handles terminal input in a clean, thread-safe manner using a producer-consumer pattern.
+ *
+ * This class is responsible for:
+ * 1. Reading input from the terminal based on different types of requests:
+ *    - Project input: Reading raw input for a specific project
+ *    - Prompts: Handling interactive prompts with user feedback
+ *    - Control keys: Monitoring for special control keys in non-dumb terminals
+ *
+ * 2. Managing input state through InputRequest objects which specify:
+ *    - The type of input needed (project input, prompt, or control keys)
+ *    - The project requiring input
+ *    - How many bytes to read
+ *
+ * 3. Converting input to appropriate Message objects and sending them to either:
+ *    - daemonDispatch: for prompt responses
+ *    - daemonReceive: for project input and control keys
+ *
+ * The class detects end-of-stream conditions (EOF) and communicates them back through
+ * the message system, which is crucial for handling piped input (e.g., cat file | mvnd ...).
+ *
+ * Input handling differs based on terminal type:
+ * - Normal terminals: Handle all input types including control keys
+ * - Dumb terminals: Only handle project input and prompts, ignore control keys
+ */
+public class TerminalInputHandler implements AutoCloseable {
+    private final Terminal terminal;
+    private final BlockingQueue<InputRequest> inputRequests;
+    private volatile boolean closing;
+    private final Thread inputThread;
+    private final boolean dumb;
+    private volatile int maxThreads;
+
+    private volatile Consumer<Message> daemonDispatch;
+    private volatile Consumer<Message> daemonReceive;
+
+    private static class InputRequest {
+        final String projectId; // null for control keys
+        final Message.Prompt prompt; // non-null only for prompt requests
+        final boolean isControlKey; // true for control key listening
+        final int bytesToRead; // max number of bytes to read
+
+        private InputRequest(String projectId, Message.Prompt prompt, boolean isControlKey, int bytesToRead) {
+            this.projectId = projectId;
+            this.prompt = prompt;
+            this.isControlKey = isControlKey;
+            this.bytesToRead = bytesToRead;
+        }
+
+        static InputRequest forProject(String projectId, int bytesToRead) {
+            return new InputRequest(projectId, null, false, bytesToRead);
+        }
+
+        static InputRequest forPrompt(Message.Prompt prompt) {
+            return new InputRequest(prompt.getProjectId(), prompt, false, 0);
+        }
+
+        static InputRequest forControlKeys() {
+            return new InputRequest(null, null, true, 0);
+        }
+    }
+
+    public TerminalInputHandler(Terminal terminal, boolean dumb) {
+        this.terminal = terminal;
+        this.inputRequests = new LinkedBlockingQueue<>();
+        this.dumb = dumb;
+
+        // Always create input thread as we always need to handle prompts and project input
+        this.inputThread = new Thread(() -> {
+            try {
+                while (!closing) {
+                    InputRequest request = inputRequests.poll(10, TimeUnit.MILLISECONDS);
+                    if (request == null) {
+                        // No active request
+                        if (!dumb) {
+                            // Only listen for control keys in non-dumb mode
+                            handleControlKeys();
+                        }
+                    } else if (request.prompt != null) {
+                        // Always handle prompts
+                        handlePrompt(request.prompt);
+                    } else if (request.projectId != null) {
+                        // Always handle project input
+                        handleProjectInput(request.projectId, request.bytesToRead);
+                    } else if (!dumb && request.isControlKey) {
+                        // Only handle control keys in non-dumb mode
+                        handleControlKeys();
+                    }
+                }
+            } catch (InterruptedException e) {
+                Thread.currentThread().interrupt();
+            } catch (IOException e) {
+                // Handle terminal IO exception
+            }
+        });
+        inputThread.setDaemon(true);
+        inputThread.start();
+    }
+
+    private void handleProjectInput(String projectId, int bytesToRead) throws IOException {
+        if (daemonReceive == null) {
+            return;
+        }
+        char[] buf = bytesToRead > 0 ? new char[bytesToRead] : new char[8192];
+        int idx = 0;
+        int timeout = 10; // Initial timeout for first read
+
+        while ((bytesToRead < 0 || idx < bytesToRead) && idx < buf.length) {
+            int c = terminal.reader().read(timeout);
+            if (c < 0) {
+                // End of stream reached
+                daemonReceive.accept(Message.inputEof());
+                break;
+            }
+            buf[idx++] = (char) c;
+            timeout = idx > 0 ? 1 : 10; // Shorter timeout after first char
+        }
+
+        if (idx > 0) {
+            String data = String.valueOf(buf, 0, idx);
+            daemonReceive.accept(Message.inputResponse(data));
+        }
+    }
+
+    private void handleControlKeys() throws IOException {
+        if (daemonReceive == null) {
+            return;
+        }
+        int c = terminal.reader().read(10);
+        if (c != -1 && isControlKey(c)) {
+            daemonReceive.accept(Message.keyboardInput((char) c));
+        }
+    }
+
+    private void handlePrompt(Message.Prompt prompt) throws IOException {
+        if (daemonDispatch == null) {
+            return;
+        }
+        if (prompt.getMessage() != null) {
+            String msg = formatPromptMessage(prompt);
+            terminal.writer().print(msg);
+        }
+        terminal.flush();
+
+        StringBuilder sb = new StringBuilder();
+        while (true) {
+            int c = terminal.reader().read();
+            if (c < 0) {
+                break;
+            } else if (c == '\n' || c == '\r') {
+                terminal.writer().println();
+                daemonDispatch.accept(prompt.response(sb.toString()));
+                break;
+            } else if (c == 127) { // Backspace
+                if (sb.length() > 0) {
+                    sb.setLength(sb.length() - 1);
+                    terminal.writer().write("\b \b");
+                    terminal.writer().flush();
+                }
+            } else {
+                terminal.writer().print((char) c);
+                terminal.writer().flush();
+                sb.append((char) c);
+            }
+        }
+        // After prompt is handled, go back to control key listening only if not dumb
+        if (!dumb) {
+            inputRequests.offer(InputRequest.forControlKeys());
+        }
+    }
+
+    private boolean isControlKey(int c) {
+        return c == TerminalOutput.KEY_PLUS
+                || c == TerminalOutput.KEY_MINUS
+                || c == TerminalOutput.KEY_CTRL_L
+                || c == TerminalOutput.KEY_CTRL_M
+                || c == TerminalOutput.KEY_CTRL_B;
+    }
+
+    private String formatPromptMessage(Message.Prompt prompt) {
+        return (maxThreads > 1)
+                ? String.format("[%s] %s", prompt.getProjectId(), prompt.getMessage())
+                : prompt.getMessage();
+    }
+
+    public void setDaemonDispatch(Consumer<Message> daemonDispatch) {
+        this.daemonDispatch = daemonDispatch;
+    }
+
+    public void setDaemonReceive(Consumer<Message> daemonReceive) {
+        this.daemonReceive = daemonReceive;
+    }
+
+    public void setMaxThreads(int maxThreads) {
+        this.maxThreads = maxThreads;
+    }
+
+    public void requestProjectInput(String projectId, int bytesToRead) {
+        inputRequests.clear(); // Clear any pending requests
+        inputRequests.offer(InputRequest.forProject(projectId, bytesToRead));
+    }
+
+    public void requestPrompt(Message.Prompt prompt) {
+        inputRequests.clear(); // Clear any pending requests
+        inputRequests.offer(InputRequest.forPrompt(prompt));
+    }
+
+    @Override
+    public void close() {
+        closing = true;
+        if (inputThread != null) {
+            inputThread.interrupt();
+        }
+    }
+}

common/src/main/java/org/mvndaemon/mvnd/common/logging/TerminalOutput.java

@@ -19,7 +19,6 @@
 package org.mvndaemon.mvnd.common.logging;
 
 import java.io.IOException;
-import java.io.InterruptedIOException;
 import java.io.Writer;
 import java.nio.charset.StandardCharsets;
 import java.nio.file.Files;
@@ -32,9 +31,6 @@ import java.util.Deque;
 import java.util.LinkedHashMap;
 import java.util.List;
 import java.util.Map;
-import java.util.concurrent.TimeUnit;
-import java.util.concurrent.locks.ReadWriteLock;
-import java.util.concurrent.locks.ReentrantReadWriteLock;
 import java.util.function.Consumer;
 import java.util.stream.Collector;
 import java.util.stream.Collectors;
@@ -102,19 +98,16 @@ public class TerminalOutput implements ClientOutput {
     private final ArrayList<ExecutionFailureEvent> failures = new ArrayList<>();
     private final LinkedHashMap<String, Project> projects = new LinkedHashMap<>();
     private final ClientLog log;
-    private final Thread reader;
     private volatile Exception exception;
     private volatile boolean closing;
     private final long start;
-    private final ReadWriteLock readInput = new ReentrantReadWriteLock();
     private final boolean dumb;
+    private final TerminalInputHandler inputHandler;
 
     /** A sink for sending messages back to the daemon */
     private volatile Consumer<Message> daemonDispatch;
     /** A sink for queuing messages to the main queue */
     private volatile Consumer<Message> daemonReceive;
-    /** The project id which is trying to read the input stream */
-    private volatile String projectReadingInput;
 
     /*
      * The following non-final fields are read/written from the main thread only.
@@ -173,14 +166,7 @@ public class TerminalOutput implements ClientOutput {
                 Terminal.Signal.INT, sig -> daemonDispatch.accept(Message.BareMessage.CANCEL_BUILD_SINGLETON));
         this.display = new Display(terminal, false);
         this.log = logFile == null ? new MessageCollector() : new FileLog(logFile);
-        if (!dumb) {
-            final Thread r = new Thread(this::readInputLoop);
-            r.setDaemon(true);
-            r.start();
-            this.reader = r;
-        } else {
-            this.reader = null;
-        }
+        this.inputHandler = new TerminalInputHandler(terminal, this.dumb);
     }
 
     @Override
@@ -191,11 +177,13 @@ public class TerminalOutput implements ClientOutput {
     @Override
     public void setDaemonDispatch(Consumer<Message> daemonDispatch) {
         this.daemonDispatch = daemonDispatch;
+        this.inputHandler.setDaemonDispatch(daemonDispatch);
     }
 
     @Override
     public void setDaemonReceive(Consumer<Message> daemonReceive) {
         this.daemonReceive = daemonReceive;
+        this.inputHandler.setDaemonReceive(daemonReceive);
     }
 
     @Override
@@ -226,6 +214,7 @@ public class TerminalOutput implements ClientOutput {
                 final int totalProjectsDigits = (int) (Math.log10(totalProjects) + 1);
                 this.projectsDoneFomat = "%" + totalProjectsDigits + "d";
                 this.maxThreads = bs.getMaxThreads();
+                this.inputHandler.setMaxThreads(maxThreads);
                 this.artifactIdFormat = "%-" + bs.getArtifactIdDisplayLength() + "s ";
                 final int maxThreadsDigits = (int) (Math.log10(maxThreads) + 1);
                 this.threadsFormat = "%" + (maxThreadsDigits * 3 + 2) + "s";
@@ -343,42 +332,8 @@ public class TerminalOutput implements ClientOutput {
                     terminal.writer().println("");
                     break;
                 }
-                readInput.writeLock().lock();
-                try {
-                    clearDisplay();
-                    if (prompt.getMessage() != null) {
-                        String msg = (maxThreads > 1)
-                                ? String.format("[%s] %s", prompt.getProjectId(), prompt.getMessage())
-                                : prompt.getMessage();
-                        terminal.writer().print(msg);
-                    }
-                    terminal.flush();
-                    StringBuilder sb = new StringBuilder();
-                    while (true) {
-                        int c = terminal.reader().read();
-                        if (c < 0) {
-                            break;
-                        } else if (c == '\n' || c == '\r') {
-                            terminal.writer().println();
-                            daemonDispatch.accept(prompt.response(sb.toString()));
-                            break;
-                        } else if (c == 127) {
-                            if (sb.length() > 0) {
-                                sb.setLength(sb.length() - 1);
-                                terminal.writer().write("\b \b");
-                                terminal.writer().flush();
-                            }
-                        } else {
-                            terminal.writer().print((char) c);
-                            terminal.writer().flush();
-                            sb.append((char) c);
-                        }
-                    }
-                } catch (IOException e) {
-                    throw new RuntimeException(e);
-                } finally {
-                    readInput.writeLock().unlock();
-                }
+                clearDisplay();
+                inputHandler.requestPrompt(prompt);
                 break;
             }
             case Message.BUILD_LOG_MESSAGE: {
@@ -456,7 +411,7 @@ public class TerminalOutput implements ClientOutput {
             }
             case Message.REQUEST_INPUT: {
                 RequestInput ri = (RequestInput) entry;
-                projectReadingInput = ri.getProjectId();
+                inputHandler.requestProjectInput(ri.getProjectId(), ri.getBytesToRead());
                 break;
             }
             case Message.INPUT_DATA: {
@@ -502,45 +457,6 @@ public class TerminalOutput implements ClientOutput {
         return terminal;
     }
 
-    void readInputLoop() {
-        try {
-            while (!closing) {
-                if (readInput.readLock().tryLock(10, TimeUnit.MILLISECONDS)) {
-                    if (projectReadingInput != null) {
-                        char[] buf = new char[256];
-                        int idx = 0;
-                        while (idx < buf.length) {
-                            int c = terminal.reader().read(idx > 0 ? 1 : 10);
-                            if (c < 0) {
-                                break;
-                            }
-                            buf[idx++] = (char) c;
-                        }
-                        if (idx > 0) {
-                            String data = String.valueOf(buf, 0, idx);
-                            daemonReceive.accept(Message.inputResponse(data));
-                        }
-                    } else {
-                        int c = terminal.reader().read(10);
-                        if (c == -1) {
-                            break;
-                        }
-                        if (c == KEY_PLUS || c == KEY_MINUS || c == KEY_CTRL_L || c == KEY_CTRL_M || c == KEY_CTRL_B) {
-                            daemonReceive.accept(Message.keyboardInput((char) c));
-                        }
-                    }
-                    readInput.readLock().unlock();
-                }
-            }
-        } catch (InterruptedException e) {
-            Thread.currentThread().interrupt();
-        } catch (InterruptedIOException e) {
-            Thread.currentThread().interrupt();
-        } catch (IOException e) {
-            this.exception = e;
-        }
-    }
-
     private void clearDisplay() {
         if (!noBuffering && !dumb) {
             display.update(Collections.emptyList(), 0);
@@ -560,9 +476,7 @@ public class TerminalOutput implements ClientOutput {
     @Override
     public void close() throws Exception {
         closing = true;
-        if (reader != null) {
-            reader.interrupt();
-        }
+        inputHandler.close();
         log.close();
         terminal.handle(Terminal.Signal.INT, previousIntHandler);
         terminal.close();
@@ -781,13 +695,11 @@ public class TerminalOutput implements ClientOutput {
                         .style(AttributedStyle.BOLD)
                         .append(String.format(
                                 threadsFormat,
-                                new StringBuilder(threadsFormat.length())
-                                        .append(projectsCount)
-                                        .append('/')
-                                        .append(Math.max(0, projectsCount - dispLines))
-                                        .append('/')
-                                        .append(maxThreads)
-                                        .toString()))
+                                String.valueOf(projectsCount)
+                                        + '/'
+                                        + Math.max(0, projectsCount - dispLines)
+                                        + '/'
+                                        + maxThreads))
                         .style(AttributedStyle.DEFAULT);
 
                 /* Progress */
@@ -801,7 +713,7 @@ public class TerminalOutput implements ClientOutput {
                         .append('%')
                         .style(AttributedStyle.DEFAULT);
 
-            } else if (buildStatus != null) {
+            } else {
                 asb.style(AttributedStyle.BOLD).append(buildStatus).style(AttributedStyle.DEFAULT);
             }
 

daemon/src/main/java/org/apache/maven/cli/DaemonMavenInvoker.java

@@ -54,14 +54,13 @@ public class DaemonMavenInvoker extends ResidentMavenInvoker {
                     if (context.coloredOutput != null) {
                         builder.color(context.coloredOutput);
                     }
+                    // we do want to pause input
+                    builder.paused(true);
                 },
                 terminal -> doConfigureWithTerminal(context, terminal));
         context.terminal = MessageUtils.getTerminal();
         context.closeables.add(MessageUtils::systemUninstall);
         MessageUtils.registerShutdownHook();
-        if (context.coloredOutput != null) {
-            MessageUtils.setColorEnabled(context.coloredOutput);
-        }
     }
 
     @Override

daemon/src/main/java/org/mvndaemon/mvnd/daemon/DaemonInputStream.java

@@ -0,0 +1,150 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.mvndaemon.mvnd.daemon;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InterruptedIOException;
+import java.nio.charset.Charset;
+import java.util.LinkedList;
+import java.util.Objects;
+import java.util.function.BiConsumer;
+
+import org.apache.maven.logging.ProjectBuildLogAppender;
+
+/**
+ * An InputStream implementation that manages input for Maven daemon processes.
+ *
+ * This class implements a buffered input stream that:
+ * 1. Tracks which project is currently reading input using ProjectBuildLogAppender
+ * 2. Requests input from the client when needed through a callback
+ * 3. Buffers received input data in memory
+ *
+ * Key behaviors:
+ * - Input is requested through startReadingFromProject callback whenever:
+ *   a) The reading project changes
+ *   b) The input buffer is empty and more data is needed
+ * - The callback receives both the project ID and the number of bytes requested
+ * - Data is added to the buffer through addInputData, which can be called from another thread
+ * - EOF is signaled by calling addInputData with null
+ *
+ * The stream coordinates between multiple threads:
+ * - Reader thread(s): Calling read() methods to get input
+ * - Writer thread: Calling addInputData to provide input data
+ *
+ * Synchronization:
+ * - All buffer access is synchronized on the datas collection
+ * - Readers wait when no data is available using datas.wait()
+ * - Writers notify readers when new data arrives using datas.notifyAll()
+ *
+ * This implementation is particularly important for:
+ * 1. Handling piped input (e.g., cat file | mvnd ...)
+ * 2. Supporting interactive input during builds
+ * 3. Managing input across multiple project builds
+ */
+class DaemonInputStream extends InputStream {
+    private final BiConsumer<String, Integer> startReadingFromProject;
+    private final LinkedList<byte[]> datas = new LinkedList<>();
+    private final Charset charset;
+    private int pos = -1;
+    private String projectReading = null;
+    private volatile boolean eof = false;
+
+    DaemonInputStream(BiConsumer<String, Integer> startReadingFromProject) {
+        this.startReadingFromProject = startReadingFromProject;
+        this.charset = Charset.forName(System.getProperty("file.encoding"));
+    }
+
+    @Override
+    public int available() throws IOException {
+        synchronized (datas) {
+            String projectId = ProjectBuildLogAppender.getProjectId();
+            if (!eof && !Objects.equals(projectId, projectReading)) {
+                projectReading = projectId;
+                startReadingFromProject.accept(projectId, 1);
+            }
+            return datas.stream().mapToInt(a -> a.length).sum() - Math.max(pos, 0);
+        }
+    }
+
+    @Override
+    public int read() throws IOException {
+        byte[] b = new byte[1];
+        int read = read(b, 0, 1);
+        if (read == 1) {
+            return b[0];
+        }
+        return -1;
+    }
+
+    @Override
+    public int read(byte[] b, int off, int len) throws IOException {
+        synchronized (datas) {
+            if (eof && datas.isEmpty()) {
+                return -1; // Return EOF if we've reached the end and no more data
+            }
+            String projectId = ProjectBuildLogAppender.getProjectId();
+            if (!Objects.equals(projectId, projectReading)) {
+                projectReading = projectId;
+            }
+            int read = 0;
+            while (read < len) {
+                if (datas.isEmpty()) {
+                    if (eof) {
+                        return read > 0 ? read : -1; // Exit properly on EOF
+                    }
+                    if (read > 0) {
+                        break;
+                    }
+                    // Always notify we need input when waiting for data
+                    startReadingFromProject.accept(projectReading, len - read);
+                    try {
+                        datas.wait();
+                    } catch (InterruptedException e) {
+                        throw new InterruptedIOException("Interrupted");
+                    }
+                    pos = -1;
+                    continue;
+                }
+                byte[] curData = datas.getFirst();
+                if (pos >= curData.length) {
+                    datas.removeFirst();
+                    pos = -1;
+                    continue;
+                }
+                if (pos < 0) {
+                    pos = 0;
+                }
+                b[off + read++] = curData[pos++];
+            }
+            return read;
+        }
+    }
+
+    public void addInputData(String data) {
+        synchronized (datas) {
+            if (data == null) {
+                eof = true;
+            } else {
+                datas.add(data.getBytes(charset));
+            }
+            datas.notifyAll();
+        }
+    }
+}

daemon/src/main/java/org/mvndaemon/mvnd/daemon/Server.java

@@ -20,22 +20,18 @@ package org.mvndaemon.mvnd.daemon;
 
 import java.io.IOException;
 import java.io.InputStream;
-import java.io.InterruptedIOException;
 import java.lang.reflect.Field;
 import java.nio.ByteBuffer;
 import java.nio.channels.ServerSocketChannel;
 import java.nio.channels.SocketChannel;
-import java.nio.charset.Charset;
 import java.security.MessageDigest;
 import java.security.SecureRandom;
 import java.time.Duration;
 import java.util.ArrayList;
 import java.util.Arrays;
-import java.util.LinkedList;
 import java.util.List;
 import java.util.Locale;
 import java.util.Map;
-import java.util.Objects;
 import java.util.concurrent.BlockingQueue;
 import java.util.concurrent.CompletableFuture;
 import java.util.concurrent.Executors;
@@ -46,7 +42,6 @@ import java.util.concurrent.TimeUnit;
 import java.util.concurrent.locks.Condition;
 import java.util.concurrent.locks.Lock;
 import java.util.concurrent.locks.ReentrantLock;
-import java.util.function.Consumer;
 import java.util.function.Predicate;
 import java.util.stream.Collectors;
 
@@ -513,9 +508,11 @@ public class Server implements AutoCloseable, Runnable {
         final BlockingQueue<Message> sendQueue = new PriorityBlockingQueue<>(64, Message.getMessageComparator());
         final BlockingQueue<Message> recvQueue = new LinkedBlockingDeque<>();
         final BuildEventListener buildEventListener = new ClientDispatcher(sendQueue);
-        final DaemonInputStream daemonInputStream =
-                new DaemonInputStream(projectId -> sendQueue.add(Message.requestInput(projectId)));
+        final DaemonInputStream daemonInputStream = new DaemonInputStream(
+                (projectId, bytesToRead) -> sendQueue.add(Message.requestInput(projectId, bytesToRead)));
+        InputStream in = System.in;
         try {
+            System.setIn(daemonInputStream);
 
             LOGGER.info("Executing request");
 
@@ -639,6 +636,7 @@ public class Server implements AutoCloseable, Runnable {
         } catch (Throwable t) {
             LOGGER.error("Error while building project", t);
         } finally {
+            System.setIn(in);
             if (!noDaemon) {
                 LOGGER.info("Daemon back to idle");
                 updateState(DaemonState.Idle);
@@ -688,67 +686,4 @@ public class Server implements AutoCloseable, Runnable {
     public String toString() {
         return info.toString();
     }
-
-    static class DaemonInputStream extends InputStream {
-        private final Consumer<String> startReadingFromProject;
-        private final LinkedList<byte[]> datas = new LinkedList<>();
-        private int pos = -1;
-        private String projectReading = null;
-
-        DaemonInputStream(Consumer<String> startReadingFromProject) {
-            this.startReadingFromProject = startReadingFromProject;
-        }
-
-        @Override
-        public int available() throws IOException {
-            synchronized (datas) {
-                String projectId = ProjectBuildLogAppender.getProjectId();
-                if (!Objects.equals(projectId, projectReading)) {
-                    projectReading = projectId;
-                    startReadingFromProject.accept(projectId);
-                }
-                return datas.stream().mapToInt(a -> a.length).sum() - Math.max(pos, 0);
-            }
-        }
-
-        @Override
-        public int read() throws IOException {
-            synchronized (datas) {
-                String projectId = ProjectBuildLogAppender.getProjectId();
-                if (!Objects.equals(projectId, projectReading)) {
-                    projectReading = projectId;
-                    startReadingFromProject.accept(projectId);
-                    // TODO: start a 10ms timer to turn data off
-                }
-                for (; ; ) {
-                    if (datas.isEmpty()) {
-                        try {
-                            datas.wait();
-                        } catch (InterruptedException e) {
-                            throw new InterruptedIOException("Interrupted");
-                        }
-                        pos = -1;
-                        continue;
-                    }
-                    byte[] curData = datas.getFirst();
-                    if (pos >= curData.length) {
-                        datas.removeFirst();
-                        pos = -1;
-                        continue;
-                    }
-                    if (pos < 0) {
-                        pos = 0;
-                    }
-                    return curData[pos++];
-                }
-            }
-        }
-
-        public void addInputData(String data) {
-            synchronized (datas) {
-                datas.add(data.getBytes(Charset.forName(System.getProperty("file.encoding"))));
-                datas.notifyAll();
-            }
-        }
-    }
 }

integration-tests/src/test/java/org/mvndaemon/mvnd/it/InputStreamNativeIT.java

@@ -0,0 +1,64 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.mvndaemon.mvnd.it;
+
+import javax.inject.Inject;
+
+import java.io.IOException;
+
+import org.junit.jupiter.api.Test;
+import org.mvndaemon.mvnd.assertj.TestClientOutput;
+import org.mvndaemon.mvnd.client.Client;
+import org.mvndaemon.mvnd.client.DaemonParameters;
+import org.mvndaemon.mvnd.common.Message;
+import org.mvndaemon.mvnd.junit.MvndNativeTest;
+
+@MvndNativeTest(projectDir = "src/test/projects/input-stream")
+class InputStreamNativeIT {
+
+    @Inject
+    Client client;
+
+    @Inject
+    DaemonParameters parameters;
+
+    @Test
+    void installPluginAndTest() throws IOException, InterruptedException {
+        final TestClientOutput output = new TestClientOutput() {
+            int input = 0;
+
+            @Override
+            public void accept(Message message) {
+                if (message instanceof Message.RequestInput) {
+                    if (input++ < 10) {
+                        daemonDispatch.accept(Message.inputResponse("0123456789\n"));
+                    } else {
+                        daemonDispatch.accept(Message.inputEof());
+                    }
+                }
+                if (!(message instanceof Message.TransferEvent)) {
+                    super.accept(message);
+                }
+            }
+        };
+        client.execute(output, "install").assertSuccess();
+
+        client.execute(output, "org.mvndaemon.mvnd.test.input-stream:echo-maven-plugin:echo");
+    }
+}

integration-tests/src/test/java/org/mvndaemon/mvnd/it/InputStreamTest.java

@@ -0,0 +1,24 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.mvndaemon.mvnd.it;
+
+import org.mvndaemon.mvnd.junit.MvndTest;
+
+@MvndTest(projectDir = "src/test/projects/input-stream")
+class InputStreamTest extends InputStreamNativeIT {}

integration-tests/src/test/projects/input-stream/pom.xml

@@ -0,0 +1,85 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+
+    Licensed under the Apache License, Version 2.0 (the "License");
+    you may not use this file except in compliance with the License.
+    You may obtain a copy of the License at
+
+         http://www.apache.org/licenses/LICENSE-2.0
+
+    Unless required by applicable law or agreed to in writing, software
+    distributed under the License is distributed on an "AS IS" BASIS,
+    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+    See the License for the specific language governing permissions and
+    limitations under the License.
+
+-->
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+  <modelVersion>4.0.0</modelVersion>
+
+  <groupId>org.mvndaemon.mvnd.test.input-stream</groupId>
+  <artifactId>echo-maven-plugin</artifactId>
+  <version>1.0-SNAPSHOT</version>
+  <packaging>maven-plugin</packaging>
+
+  <name>echo-maven-plugin Maven Plugin</name>
+
+  <prerequisites>
+    <maven>${maven.version}</maven>
+  </prerequisites>
+
+  <properties>
+    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+    <maven.compiler.source>8</maven.compiler.source>
+    <maven.compiler.target>8</maven.compiler.target>
+    <maven.version>3.9.9</maven.version>
+  </properties>
+
+  <dependencies>
+    <dependency>
+      <groupId>org.apache.maven</groupId>
+      <artifactId>maven-plugin-api</artifactId>
+      <version>${maven.version}</version>
+      <scope>provided</scope>
+    </dependency>
+    <dependency>
+      <groupId>org.apache.maven</groupId>
+      <artifactId>maven-core</artifactId>
+      <version>${maven.version}</version>
+      <scope>provided</scope>
+    </dependency>
+    <dependency>
+      <groupId>org.apache.maven</groupId>
+      <artifactId>maven-artifact</artifactId>
+      <version>${maven.version}</version>
+      <scope>provided</scope>
+    </dependency>
+    <dependency>
+      <groupId>org.apache.maven.plugin-tools</groupId>
+      <artifactId>maven-plugin-annotations</artifactId>
+      <version>3.13.1</version>
+      <scope>provided</scope>
+    </dependency>
+  </dependencies>
+
+  <build>
+    <plugins>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-plugin-plugin</artifactId>
+        <configuration>
+<!--          <skipErrorNoDescriptorsFound>true</skipErrorNoDescriptorsFound>-->
+        </configuration>
+        <executions>
+          <execution>
+            <id>mojo-descriptor</id>
+            <goals>
+              <goal>descriptor</goal>
+            </goals>
+          </execution>
+        </executions>
+      </plugin>
+    </plugins>
+  </build>
+</project>

integration-tests/src/test/projects/input-stream/src/main/java/org/apache/maven/its/EchoMojo.java

@@ -0,0 +1,57 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.apache.maven.its;
+
+import org.apache.maven.plugin.AbstractMojo;
+import org.apache.maven.plugin.MojoExecutionException;
+
+import org.apache.maven.plugins.annotations.Mojo;
+import org.apache.maven.plugins.annotations.Parameter;
+
+import java.io.BufferedReader;
+import java.io.File;
+import java.io.FileWriter;
+import java.io.IOException;
+import java.util.Scanner;
+
+/**
+ * Goal which copy stdin to stdout.
+ */
+@Mojo( name = "echo", requiresProject = false )
+public class EchoMojo
+    extends AbstractMojo
+{
+
+    public void execute()
+        throws MojoExecutionException
+    {
+        getLog().info("Reading from standard input. Type 'exit' to stop.");
+
+        try (Scanner scanner = new Scanner(System.in)) {
+            while (scanner.hasNextLine()) {
+                String line = scanner.nextLine();
+                if ("exit".equalsIgnoreCase(line.trim())) {
+                    getLog().info("Exiting...");
+                    break;
+                }
+                System.out.println(line);
+            }
+        }
+    }
+}