| /* |
| * Copyright 2000-2009 JetBrains s.r.o. |
| * |
| * 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. |
| */ |
| package com.intellij.cvsSupport2.javacvsImpl.io; |
| |
| import com.intellij.openapi.diagnostic.Logger; |
| import com.intellij.openapi.progress.ProcessCanceledException; |
| import com.intellij.util.concurrency.Semaphore; |
| import org.jetbrains.annotations.NonNls; |
| import org.netbeans.lib.cvsclient.ICvsCommandStopper; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.util.ArrayList; |
| import java.util.Collection; |
| |
| /** |
| * author: lesya |
| */ |
| |
| public class ReadThread implements Runnable { |
| |
| public final static Collection<ReadThread> READ_THREADS = new ArrayList<ReadThread>(); |
| |
| private static final Logger LOG = Logger.getInstance("#com.intellij.cvsSupport2.javacvsImpl.io.ReadThread"); |
| |
| private boolean myAtEndOfStream = false; |
| private final ICvsCommandStopper myCvsCommandStopper; |
| private static final int INITIAL_BUFFER_SIZE = 128 * 1024; |
| private final byte[] myBuffer = new byte[INITIAL_BUFFER_SIZE]; |
| private final byte[] myReadBuffer = new byte[INITIAL_BUFFER_SIZE]; |
| private int myFirstIndex = 0; |
| private int myLastIndex = 0; |
| private IOException myException; |
| private final InputStream myInputStream; |
| private final Semaphore myStarted = new Semaphore(); |
| public static final int TIMEOUT = 3000; |
| public static final int END_OF_STREAM = -1; |
| private boolean myIsClosed = false; |
| @NonNls private static final String NAME = "CvsReadThread"; |
| |
| public ReadThread(InputStream inputStream, ICvsCommandStopper cvsCommandStopper) { |
| myInputStream = inputStream; |
| myCvsCommandStopper = cvsCommandStopper; |
| READ_THREADS.add(this); |
| } |
| |
| public void prepareForWait() { |
| myStarted.down(); |
| } |
| |
| public void waitForStart(){ |
| myStarted.waitFor(); |
| } |
| |
| public String toString() { |
| @NonNls StringBuffer buffer = new StringBuffer(); |
| buffer.append(super.toString()); |
| buffer.append(", atEnd: "); |
| buffer.append(myAtEndOfStream); |
| buffer.append(", firstIndex: "); |
| buffer.append(myFirstIndex); |
| buffer.append(", lastIndex: "); |
| buffer.append(myLastIndex); |
| buffer.append(", exception: "); |
| buffer.append(myException); |
| buffer.append(", closed: "); |
| buffer.append(myIsClosed); |
| return buffer.toString(); |
| } |
| |
| public void run() { |
| Thread.currentThread().setPriority(Thread.MAX_PRIORITY); |
| try { |
| if (LOG.isDebugEnabled()) LOG.info("Starting CvsReadThread " + this); |
| while (true) { |
| try { |
| waitForRead(); |
| if (myAtEndOfStream || (myException != null)) { |
| executionCompleted(); |
| return; |
| } |
| int result = myInputStream.read(myReadBuffer); |
| if (result > 0) { |
| writeAndNotify(result); |
| } |
| else if (result == END_OF_STREAM) { |
| detectEndAndNotify(); |
| return; |
| } |
| } |
| catch (IOException e) { |
| detectExceptionAndNotify(e); |
| return; |
| } |
| catch (Throwable t) { |
| detectExceptionAndNotify(new IOException(t.getLocalizedMessage())); |
| return; |
| } |
| } |
| } |
| finally { |
| Thread.currentThread().setPriority(Thread.NORM_PRIORITY); |
| } |
| } |
| |
| public synchronized int read() throws IOException { |
| int result = waitForAvailableBytes(); |
| if (result == END_OF_STREAM) return END_OF_STREAM; |
| return internalRead(); |
| } |
| |
| public synchronized int read(byte b[], int off, int len) throws IOException { |
| int result = waitForAvailableBytes(); |
| if (result == END_OF_STREAM) return END_OF_STREAM; |
| return internalRead(b, off, len); |
| } |
| |
| public synchronized long skip(long n) throws IOException { |
| int result = waitForAvailableBytes(); |
| if (result == END_OF_STREAM) return END_OF_STREAM; |
| return internalSkip(n); |
| } |
| |
| public synchronized int available() throws IOException { |
| if (size() > 0) return size(); |
| if (myAtEndOfStream) return END_OF_STREAM; |
| return myInputStream.available(); |
| } |
| |
| private int waitForAvailableBytes() throws IOException { |
| while (size() == 0 && !myAtEndOfStream) { |
| try { |
| notify(); |
| wait(TIMEOUT); |
| } |
| catch (InterruptedException e) { |
| throw new IOException(e.getLocalizedMessage()); |
| } |
| if (size() == 0 && !myAtEndOfStream) { |
| if (myCvsCommandStopper.isAborted()) { |
| throw new ProcessCanceledException(); |
| } |
| } |
| } |
| if (myException != null) throw myException; |
| if (myAtEndOfStream && (size() == 0)) { |
| return END_OF_STREAM; |
| } |
| return -2; |
| } |
| |
| private synchronized void detectExceptionAndNotify(IOException e) { |
| LOG.info(e); |
| myException = e; |
| executionCompleted(); |
| notify(); |
| } |
| |
| private synchronized void detectEndAndNotify() { |
| if (!myAtEndOfStream) { |
| myAtEndOfStream = true; |
| notify(); |
| } |
| executionCompleted(); |
| } |
| |
| private synchronized void writeAndNotify(int result) { |
| synchronized (this) { |
| if (size() == 0) { |
| myFirstIndex = 0; |
| myLastIndex = 0; |
| } |
| System.arraycopy(myReadBuffer, 0, myBuffer, myLastIndex, result); |
| myLastIndex += result; |
| } |
| notify(); |
| } |
| |
| private synchronized void waitForRead() throws InterruptedException { |
| myStarted.up(); |
| if (myAtEndOfStream || (myException != null)) { |
| return; |
| } |
| wait(); |
| } |
| |
| private void executionCompleted() { |
| READ_THREADS.remove(this); |
| if (LOG.isDebugEnabled()) LOG.info("Stopping CvsReadThread " + this); |
| } |
| |
| private int size() { |
| return myLastIndex - myFirstIndex; |
| } |
| |
| public synchronized void close() throws IOException { |
| myIsClosed = true; |
| if (myAtEndOfStream) return; |
| myAtEndOfStream = true; |
| notify(); |
| } |
| |
| private synchronized int internalRead() { |
| try { |
| return (char)myBuffer[myFirstIndex++]; |
| } |
| finally { |
| if (myFirstIndex > myLastIndex) { |
| LOG.assertTrue(false); |
| } |
| } |
| } |
| |
| private synchronized int internalRead(byte b[], int off, int len) { |
| int result = Math.min(len, size()); |
| System.arraycopy(myBuffer, myFirstIndex, b, off, result); |
| myFirstIndex += result; |
| return result; |
| } |
| |
| private long internalSkip(long n) { |
| long result = Math.min(n, size()); |
| myFirstIndex += result; |
| return result; |
| } |
| |
| |
| } |
| |