/*

 * Copyright (c) 2003, 2015, 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 sun.management;

import java.util.regex.*;

import java.util.List;

import java.util.ListIterator;

import java.util.Iterator;

import java.util.ArrayList;

import java.util.Map;

import java.util.TreeMap;

import sun.management.counter.*;

/**

 * Implementation class of HotspotCompilationMBean interface.

 *

 * Internal, uncommitted management interface for Hotspot compilation

 * system.

 *

 */

class HotspotCompilation

    implements HotspotCompilationMBean {

    private VMManagement jvm;

    /**

     * Constructor of HotspotRuntime class.

     */

    HotspotCompilation(VMManagement vm) {

        jvm = vm;

        initCompilerCounters();

    }

    // Performance counter support

    private static final String JAVA_CI    = "java.ci.";

    private static final String COM_SUN_CI = "com.sun.ci.";

    private static final String SUN_CI     = "sun.ci.";

    private static final String CI_COUNTER_NAME_PATTERN =

        JAVA_CI + "|" + COM_SUN_CI + "|" + SUN_CI;

    private LongCounter compilerThreads;

    private LongCounter totalCompiles;

    private LongCounter totalBailouts;

    private LongCounter totalInvalidates;

    private LongCounter nmethodCodeSize;

    private LongCounter nmethodSize;

    private StringCounter lastMethod;

    private LongCounter lastSize;

    private LongCounter lastType;

    private StringCounter lastFailedMethod;

    private LongCounter lastFailedType;

    private StringCounter lastInvalidatedMethod;

    private LongCounter lastInvalidatedType;

    private class CompilerThreadInfo {

        String name;

        StringCounter method;

        LongCounter type;

        LongCounter compiles;

        LongCounter time;

        CompilerThreadInfo(String bname, int index) {

            String basename = bname + "." + index + ".";

            this.name = bname + "-" + index;

            this.method = (StringCounter) lookup(basename + "method");

            this.type = (LongCounter) lookup(basename + "type");

            this.compiles = (LongCounter) lookup(basename + "compiles");

            this.time = (LongCounter) lookup(basename + "time");

        }

        @SuppressWarnings("deprecation")

        CompilerThreadStat getCompilerThreadStat() {

            MethodInfo minfo = new MethodInfo(method.stringValue(),

                                              (int) type.longValue(),

                                              -1);

            return new CompilerThreadStat(name,

                                          compiles.longValue(),

                                          time.longValue(),

                                          minfo);

        }

    }

    private List<CompilerThreadInfo> threads;

    private int numActiveThreads; // number of active compiler threads

    private Map<String, Counter> counters;

    private Counter lookup(String name) {

        Counter c = null;

        // Only one counter exists with the specified name in the

        // current implementation.  We first look up in the SUN_CI namespace

        // since most counters are in SUN_CI namespace.

        if ((c = counters.get(SUN_CI + name)) != null) {

            return c;

        }

        if ((c = counters.get(COM_SUN_CI + name)) != null) {

            return c;

        }

        if ((c = counters.get(JAVA_CI + name)) != null) {

            return c;

        }

        // FIXME: should tolerate if counter doesn't exist

        throw new AssertionError("Counter " + name + " does not exist");

    }

    private void initCompilerCounters() {

        // Build a tree map of the current list of performance counters

        counters = new TreeMap<>();

        for (Counter c: getInternalCompilerCounters()) {

            counters.put(c.getName(), c);

        }

        compilerThreads = (LongCounter) lookup("threads");

        totalCompiles = (LongCounter) lookup("totalCompiles");

        totalBailouts = (LongCounter) lookup("totalBailouts");

        totalInvalidates = (LongCounter) lookup("totalInvalidates");

        nmethodCodeSize = (LongCounter) lookup("nmethodCodeSize");

        nmethodSize = (LongCounter) lookup("nmethodSize");

        lastMethod = (StringCounter) lookup("lastMethod");

        lastSize = (LongCounter) lookup("lastSize");

        lastType = (LongCounter) lookup("lastType");

        lastFailedMethod = (StringCounter) lookup("lastFailedMethod");

        lastFailedType = (LongCounter) lookup("lastFailedType");

        lastInvalidatedMethod = (StringCounter) lookup("lastInvalidatedMethod");

        lastInvalidatedType = (LongCounter) lookup("lastInvalidatedType");

        numActiveThreads = (int) compilerThreads.longValue();

        // Allocate CompilerThreadInfo for compilerThread and adaptorThread

        threads = new ArrayList<CompilerThreadInfo>();

        for (int i = 0; i < numActiveThreads; i++) {

            if (counters.containsKey(SUN_CI + "compilerThread." + i + ".method")) {

                threads.add(new CompilerThreadInfo("compilerThread", i));

            }

        }

    }

    public int getCompilerThreadCount() {

        return numActiveThreads;

    }

    public long getTotalCompileCount() {

        return totalCompiles.longValue();

    }

    public long getBailoutCompileCount() {

        return totalBailouts.longValue();

    }

    public long getInvalidatedCompileCount() {

        return totalInvalidates.longValue();

    }

    public long getCompiledMethodCodeSize() {

        return nmethodCodeSize.longValue();

    }

    public long getCompiledMethodSize() {

        return nmethodSize.longValue();

    }

    @Deprecated

    public List<CompilerThreadStat> getCompilerThreadStats() {

        List<CompilerThreadStat> list = new ArrayList<>(threads.size());

        for (CompilerThreadInfo info : threads) {

            list.add(info.getCompilerThreadStat());

        }

        return list;

    }

    public MethodInfo getLastCompile() {

        return new MethodInfo(lastMethod.stringValue(),

                              (int) lastType.longValue(),

                              (int) lastSize.longValue());

    }

    public MethodInfo getFailedCompile() {

        return new MethodInfo(lastFailedMethod.stringValue(),

                              (int) lastFailedType.longValue(),

                              -1);

    }

    public MethodInfo getInvalidatedCompile() {

        return new MethodInfo(lastInvalidatedMethod.stringValue(),

                              (int) lastInvalidatedType.longValue(),

                              -1);

    }

    public java.util.List<Counter> getInternalCompilerCounters() {

        return jvm.getInternalCounters(CI_COUNTER_NAME_PATTERN);

    }

}