Java example source code file (MemoryPoolImpl.c)

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Java - Java tags/keywords

java_sun_management_memorypoolimpl_getpeakusage0, java_sun_management_memorypoolimpl_getusage0, java_sun_management_memorypoolimpl_setpoolcollectionsensor, jmm_collection_usage_threshold_high, jmm_collection_usage_threshold_low, jmm_usage_threshold_high, jmm_usage_threshold_low, jnicall, jnienv, jniexport, jnu_throwinternalerror, memory, null, pool

The MemoryPoolImpl.c Java example source code

/*
 * Copyright (c) 2003, 2004, 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.
 */

#include <jni.h>
#include "management.h"
#include "sun_management_MemoryPoolImpl.h"

JNIEXPORT jobject JNICALL
Java_sun_management_MemoryPoolImpl_getMemoryManagers0
  (JNIEnv *env, jobject pool)
{
    jobject mgrs = jmm_interface->GetMemoryManagers(env, pool);
    if (mgrs == NULL) {
        // Throw internal error since this implementation expects the
        // pool will never become invalid.
        JNU_ThrowInternalError(env, "Memory Pool not found");
    }
    return mgrs;
}

JNIEXPORT jobject JNICALL
Java_sun_management_MemoryPoolImpl_getUsage0
  (JNIEnv *env, jobject pool)
{
    jobject usage = jmm_interface->GetMemoryPoolUsage(env, pool);
    if (usage == NULL) {
        // Throw internal error since this implementation expects the
        // pool will never become invalid.
        JNU_ThrowInternalError(env, "Memory Pool not found");
    }
    return usage;
}

JNIEXPORT jobject JNICALL
Java_sun_management_MemoryPoolImpl_getPeakUsage0
  (JNIEnv *env, jobject pool)
{
    jobject usage = jmm_interface->GetPeakMemoryPoolUsage(env, pool);
    if (usage == NULL) {
        // Throw internal error since this implementation expects the
        // pool will never become invalid.
        JNU_ThrowInternalError(env, "Memory Pool not found");
    }
    return usage;
}

JNIEXPORT void JNICALL
Java_sun_management_MemoryPoolImpl_setUsageThreshold0
  (JNIEnv *env, jobject pool, jlong current, jlong newThreshold)
{
    // Set both high and low threshold to the same threshold
    if (newThreshold > current) {
        // high threshold has to be set first so that high >= low
        jmm_interface->SetPoolThreshold(env, pool,
                                        JMM_USAGE_THRESHOLD_HIGH, newThreshold);
        jmm_interface->SetPoolThreshold(env, pool,
                                        JMM_USAGE_THRESHOLD_LOW, newThreshold);
    } else {
        // low threshold has to be set first so that high >= low
        jmm_interface->SetPoolThreshold(env, pool,
                                        JMM_USAGE_THRESHOLD_LOW, newThreshold);
        jmm_interface->SetPoolThreshold(env, pool,
                                        JMM_USAGE_THRESHOLD_HIGH, newThreshold);
    }
}

JNIEXPORT void JNICALL
Java_sun_management_MemoryPoolImpl_setCollectionThreshold0
  (JNIEnv *env, jobject pool, jlong current, jlong newThreshold)
{
    // Set both high and low threshold to the same threshold
    if (newThreshold > current) {
        // high threshold has to be set first so that high >= low
        jmm_interface->SetPoolThreshold(env, pool,
                                        JMM_COLLECTION_USAGE_THRESHOLD_HIGH,
                                        newThreshold);
        jmm_interface->SetPoolThreshold(env, pool,
                                        JMM_COLLECTION_USAGE_THRESHOLD_LOW,
                                        newThreshold);
    } else {
        // low threshold has to be set first so that high >= low
        jmm_interface->SetPoolThreshold(env, pool,
                                        JMM_COLLECTION_USAGE_THRESHOLD_LOW,
                                        newThreshold);
        jmm_interface->SetPoolThreshold(env, pool,
                                        JMM_COLLECTION_USAGE_THRESHOLD_HIGH,
                                        newThreshold);
    }
}

JNIEXPORT void JNICALL
Java_sun_management_MemoryPoolImpl_resetPeakUsage0
  (JNIEnv *env, jobject pool)
{
    jvalue value;
    value.l = pool;
    jmm_interface->ResetStatistic(env, value, JMM_STAT_PEAK_POOL_USAGE);
}

JNIEXPORT void JNICALL
Java_sun_management_MemoryPoolImpl_setPoolUsageSensor
  (JNIEnv *env, jobject pool, jobject sensor)
{
    jmm_interface->SetPoolSensor(env, pool,
                                 JMM_USAGE_THRESHOLD_HIGH, sensor);
}

JNIEXPORT void JNICALL
Java_sun_management_MemoryPoolImpl_setPoolCollectionSensor
  (JNIEnv *env, jobject pool, jobject sensor)
{
    jmm_interface->SetPoolSensor(env, pool,
                                 JMM_COLLECTION_USAGE_THRESHOLD_HIGH, sensor);
}

JNIEXPORT jobject JNICALL
Java_sun_management_MemoryPoolImpl_getCollectionUsage0
  (JNIEnv *env, jobject pool)
{
    return jmm_interface->GetPoolCollectionUsage(env, pool);
}