--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/share/services/attachListener.hpp	Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,161 @@
+/*
+ * Copyright (c) 2005, 2013, 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.
+ *
+ * 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.
+ *
+ */
+
+#ifndef SHARE_VM_SERVICES_ATTACHLISTENER_HPP
+#define SHARE_VM_SERVICES_ATTACHLISTENER_HPP
+
+#include "memory/allocation.hpp"
+#include "utilities/debug.hpp"
+#include "utilities/ostream.hpp"
+#include "utilities/macros.hpp"
+#include "utilities/globalDefinitions.hpp"
+
+// The AttachListener thread services a queue of operations that are enqueued
+// by client tools. Each operation is identified by a name and has up to 3
+// arguments. The operation name is mapped to a function which performs the
+// operation. The function is called with an outputStream which is can use to
+// write any result data (for examples the properties command serializes
+// properties names and values to the output stream). When the function
+// complets the result value and any result data is returned to the client
+// tool.
+
+class AttachOperation;
+
+typedef jint (*AttachOperationFunction)(AttachOperation* op, outputStream* out);
+
+struct AttachOperationFunctionInfo {
+  const char* name;
+  AttachOperationFunction func;
+};
+
+class AttachListener: AllStatic {
+ public:
+  static void vm_start() NOT_SERVICES_RETURN;
+  static void init()  NOT_SERVICES_RETURN;
+  static void abort() NOT_SERVICES_RETURN;
+
+  // invoke to perform clean-up tasks when all clients detach
+  static void detachall() NOT_SERVICES_RETURN;
+
+  // indicates if the Attach Listener needs to be created at startup
+  static bool init_at_startup() NOT_SERVICES_RETURN_(false);
+
+  // indicates if we have a trigger to start the Attach Listener
+  static bool is_init_trigger() NOT_SERVICES_RETURN_(false);
+
+#if !INCLUDE_SERVICES
+  static bool is_attach_supported()             { return false; }
+#else
+ private:
+  static volatile bool _initialized;
+
+ public:
+  static bool is_initialized()                  { return _initialized; }
+  static void set_initialized()                 { _initialized = true; }
+
+  // indicates if this VM supports attach-on-demand
+  static bool is_attach_supported()             { return !DisableAttachMechanism; }
+
+  // platform specific initialization
+  static int pd_init();
+
+  // platform specific operation
+  static AttachOperationFunctionInfo* pd_find_operation(const char* name);
+
+  // platform specific flag change
+  static jint pd_set_flag(AttachOperation* op, outputStream* out);
+
+  // platform specific detachall
+  static void pd_detachall();
+
+  // platform specific data dump
+  static void pd_data_dump();
+
+  // dequeue the next operation
+  static AttachOperation* dequeue();
+#endif // !INCLUDE_SERVICES
+
+ private:
+  static bool has_init_error(TRAPS);
+};
+
+#if INCLUDE_SERVICES
+class AttachOperation: public CHeapObj<mtInternal> {
+ public:
+  enum {
+    name_length_max = 16,       // maximum length of  name
+    arg_length_max = 1024,      // maximum length of argument
+    arg_count_max = 3           // maximum number of arguments
+  };
+
+  // name of special operation that can be enqueued when all
+  // clients detach
+  static char* detachall_operation_name() { return (char*)"detachall"; }
+
+ private:
+  char _name[name_length_max+1];
+  char _arg[arg_count_max][arg_length_max+1];
+
+ public:
+  const char* name() const                      { return _name; }
+
+  // set the operation name
+  void set_name(char* name) {
+    size_t len = strlen(name);
+    assert(len <= name_length_max, "exceeds maximum name length");
+    memcpy(_name, name, MIN2(len + 1, (size_t)name_length_max));
+  }
+
+  // get an argument value
+  const char* arg(int i) const {
+    assert(i>=0 && i<arg_count_max, "invalid argument index");
+    return _arg[i];
+  }
+
+  // set an argument value
+  void set_arg(int i, char* arg) {
+    assert(i>=0 && i<arg_count_max, "invalid argument index");
+    if (arg == NULL) {
+      _arg[i][0] = '\0';
+    } else {
+      size_t len = strlen(arg);
+      assert(len <= arg_length_max, "exceeds maximum argument length");
+      memcpy(_arg[i], arg, MIN2(len + 1, (size_t)arg_length_max));
+    }
+  }
+
+  // create an operation of a given name
+  AttachOperation(char* name) {
+    set_name(name);
+    for (int i=0; i<arg_count_max; i++) {
+      set_arg(i, NULL);
+    }
+  }
+
+  // complete operation by sending result code and any result data to the client
+  virtual void complete(jint result, bufferedStream* result_stream) = 0;
+};
+#endif // INCLUDE_SERVICES
+
+#endif // SHARE_VM_SERVICES_ATTACHLISTENER_HPP