--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/langtools/src/share/classes/com/sun/tools/sjavac/comp/PooledSjavac.java	Wed Aug 13 14:44:59 2014 +0200
@@ -0,0 +1,141 @@
+/*
+ * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+package com.sun.tools.sjavac.comp;
+
+import java.io.File;
+import java.net.URI;
+import java.util.List;
+import java.util.Objects;
+import java.util.Set;
+import java.util.concurrent.Callable;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+import java.util.concurrent.ThreadFactory;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.atomic.AtomicInteger;
+
+import com.sun.tools.sjavac.Log;
+import com.sun.tools.sjavac.server.CompilationResult;
+import com.sun.tools.sjavac.server.Sjavac;
+import com.sun.tools.sjavac.server.SysInfo;
+
+/**
+ * An sjavac implementation that limits the number of concurrent calls by
+ * wrapping invocations in Callables and delegating them to a FixedThreadPool.
+ *
+ *  <p><b>This is NOT part of any supported API.
+ *  If you write code that depends on this, you do so at your own risk.
+ *  This code and its internal interfaces are subject to change or
+ *  deletion without notice.</b>
+ */
+public class PooledSjavac implements Sjavac {
+
+    final Sjavac delegate;
+    final ExecutorService pool;
+
+    public PooledSjavac(Sjavac delegate, int poolsize) {
+        Objects.requireNonNull(delegate);
+        this.delegate = delegate;
+        pool = Executors.newFixedThreadPool(poolsize, new ThreadFactory() {
+            AtomicInteger count = new AtomicInteger();
+            @Override
+            public Thread newThread(Runnable runnable) {
+                String cls = PooledSjavac.class.getSimpleName();
+                int num = count.incrementAndGet();
+                Thread t = new Thread(runnable, cls + "-" + num);
+                t.setDaemon(true);
+                return t;
+            }
+        });
+    }
+
+    @Override
+    public SysInfo getSysInfo() {
+        try {
+            return pool.submit(new Callable<SysInfo>() {
+                @Override
+                public SysInfo call() throws Exception {
+                    return delegate.getSysInfo();
+                }
+            }).get();
+        } catch (Exception e) {
+            e.printStackTrace();
+            throw new RuntimeException("Error during getSysInfo", e);
+        }
+    }
+
+    @Override
+    public CompilationResult compile(final String protocolId,
+                                     final String invocationId,
+                                     final String[] args,
+                                     final List<File> explicitSources,
+                                     final Set<URI> sourcesToCompile,
+                                     final Set<URI> visibleSources) {
+        try {
+            return pool.submit(new Callable<CompilationResult>() {
+                @Override
+                public CompilationResult call() throws Exception {
+                    return delegate.compile(protocolId,
+                                            invocationId,
+                                            args,
+                                            explicitSources,
+                                            sourcesToCompile,
+                                            visibleSources);
+                }
+            }).get();
+        } catch (Exception e) {
+            e.printStackTrace();
+            throw new RuntimeException("Error during compile", e);
+        }
+    }
+
+    @Override
+    public void shutdown() {
+        pool.shutdown(); // Disable new tasks from being submitted
+        try {
+            // Wait a while for existing tasks to terminate
+            if (!pool.awaitTermination(60, TimeUnit.SECONDS)) {
+                pool.shutdownNow(); // Cancel currently executing tasks
+                // Wait a while for tasks to respond to being cancelled
+                if (!pool.awaitTermination(60, TimeUnit.SECONDS))
+                    Log.error("ThreadPool did not terminate");
+            }
+            // Grace period for thread termination
+            Thread.sleep(1000);
+        } catch (InterruptedException ie) {
+          // (Re-)Cancel if current thread also interrupted
+          pool.shutdownNow();
+          // Preserve interrupt status
+          Thread.currentThread().interrupt();
+        }
+
+        delegate.shutdown();
+    }
+
+    @Override
+    public String serverSettings() {
+        return delegate.serverSettings();
+    }
+}