Examples with OperatingSystemMXBean java.lang.management.OperatingSystemMXBean used on opensource projects

Example 31 with OperatingSystemMXBean

use of java.lang.management.OperatingSystemMXBean in project orientdb by orientechnologies.

the class OMemory method getPhysicalMemorySize.

/**
 * Obtains the total size in bytes of the installed physical memory on this machine.
 * Note that on some VMs it's impossible to obtain the physical memory size, in this
 * case the return value will {@code -1}.
 *
 * @return the total physical memory size in bytes or {@code -1} if the size can't be obtained.
 */
public static long getPhysicalMemorySize() {
    long osMemory = -1;
    final OperatingSystemMXBean mxBean = ManagementFactory.getOperatingSystemMXBean();
    try {
        final Method memorySize = mxBean.getClass().getDeclaredMethod("getTotalPhysicalMemorySize");
        memorySize.setAccessible(true);
        osMemory = (Long) memorySize.invoke(mxBean);
    } catch (NoSuchMethodException e) {
        if (!OLogManager.instance().isDebugEnabled())
            OLogManager.instance().warn(OMemory.class, "Unable to determine the amount of installed RAM.");
        else
            OLogManager.instance().debug(OMemory.class, "Unable to determine the amount of installed RAM.", e);
    } catch (InvocationTargetException e) {
        if (!OLogManager.instance().isDebugEnabled())
            OLogManager.instance().warn(OMemory.class, "Unable to determine the amount of installed RAM.");
        else
            OLogManager.instance().debug(OMemory.class, "Unable to determine the amount of installed RAM.", e);
    } catch (IllegalAccessException e) {
        if (!OLogManager.instance().isDebugEnabled())
            OLogManager.instance().warn(OMemory.class, "Unable to determine the amount of installed RAM.");
        else
            OLogManager.instance().debug(OMemory.class, "Unable to determine the amount of installed RAM.", e);
    }
    return osMemory;
}

Example 32 with OperatingSystemMXBean

use of java.lang.management.OperatingSystemMXBean in project hazelcast by hazelcast.

the class OSInfoCollector method forEachMetric.

@Override
public void forEachMetric(Node node, BiConsumer<PhoneHomeMetrics, String> metricsConsumer) {
    OperatingSystemMXBean osMxBean = ManagementFactory.getOperatingSystemMXBean();
    try {
        metricsConsumer.accept(PhoneHomeMetrics.OPERATING_SYSTEM_NAME, osMxBean.getName());
        metricsConsumer.accept(PhoneHomeMetrics.OPERATING_SYSTEM_ARCH, osMxBean.getArch());
        metricsConsumer.accept(PhoneHomeMetrics.OPERATING_SYSTEM_VERSION, osMxBean.getVersion());
    } catch (SecurityException e) {
        metricsConsumer.accept(PhoneHomeMetrics.OPERATING_SYSTEM_NAME, "N/A");
        metricsConsumer.accept(PhoneHomeMetrics.OPERATING_SYSTEM_ARCH, "N/A");
        metricsConsumer.accept(PhoneHomeMetrics.OPERATING_SYSTEM_VERSION, "N/A");
    }
}

Example 33 with OperatingSystemMXBean

use of java.lang.management.OperatingSystemMXBean in project hazelcast by hazelcast.

the class OperatingSystemMXBeanSupport method readLongAttribute.

/**
 * Reads a long attribute from OperatingSystemMXBean.
 *
 * @param attributeName name of the attribute
 * @param defaultValue  default value if the attribute value is null
 * @return value of the attribute
 */
public static long readLongAttribute(String attributeName, long defaultValue) {
    try {
        String methodName = "get" + attributeName;
        if (GET_FREE_PHYSICAL_MEMORY_SIZE_DISABLED && methodName.equals("getFreePhysicalMemorySize")) {
            return defaultValue;
        }
        OperatingSystemMXBean systemMXBean = OPERATING_SYSTEM_MX_BEAN;
        Method method = systemMXBean.getClass().getMethod(methodName);
        try {
            method.setAccessible(true);
        } catch (Exception e) {
            return defaultValue;
        }
        Object value = method.invoke(systemMXBean);
        if (value == null) {
            return defaultValue;
        }
        if (value instanceof Long) {
            return (Long) value;
        }
        if (value instanceof Double) {
            double v = (Double) value;
            return Math.round(v * PERCENTAGE_MULTIPLIER);
        }
        if (value instanceof Number) {
            return ((Number) value).longValue();
        }
    } catch (RuntimeException re) {
        throw re;
    } catch (Exception ignored) {
        ignore(ignored);
    }
    return defaultValue;
}

Example 34 with OperatingSystemMXBean

use of java.lang.management.OperatingSystemMXBean in project Mycat-Server by MyCATApache.

the class EnvironmentInformation method getMaxJvmHeapMemory.

/**
 * The maximum JVM heap size, in bytes.
 *
 * @return The maximum JVM heap size, in bytes.
 */
public static long getMaxJvmHeapMemory() {
    long maxMemory = Runtime.getRuntime().maxMemory();
    if (maxMemory == Long.MAX_VALUE) {
        // amount of free memory unknown
        try {
            // workaround for Oracle JDK
            OperatingSystemMXBean operatingSystemMXBean = ManagementFactory.getOperatingSystemMXBean();
            Class<?> clazz = Class.forName("com.sun.management.OperatingSystemMXBean");
            Method method = clazz.getMethod("getTotalPhysicalMemorySize");
            maxMemory = (Long) method.invoke(operatingSystemMXBean) / 4;
        } catch (Throwable e) {
            throw new RuntimeException("Could not determine the amount of free memory.\n" + "Please set the maximum memory for the JVM, e.g. -Xmx512M for 512 megabytes.");
        }
    }
    return maxMemory;
}

Example 35 with OperatingSystemMXBean

use of java.lang.management.OperatingSystemMXBean in project Mycat-Server by MyCATApache.

the class EnvironmentInformation method getSizeOfFreeHeapMemory.

/**
 * Gets an estimate of the size of the free heap memory. The estimate may vary, depending on the current
 * level of memory fragmentation and the number of dead objects. For a better (but more heavy-weight)
 * estimate, use {@link #getSizeOfFreeHeapMemoryWithDefrag()}.
 *
 * @return An estimate of the size of the free heap memory, in bytes.
 */
public static long getSizeOfFreeHeapMemory() {
    Runtime r = Runtime.getRuntime();
    long maxMemory = r.maxMemory();
    if (maxMemory == Long.MAX_VALUE) {
        // amount of free memory unknown
        try {
            // workaround for Oracle JDK
            OperatingSystemMXBean operatingSystemMXBean = ManagementFactory.getOperatingSystemMXBean();
            Class<?> clazz = Class.forName("com.sun.management.OperatingSystemMXBean");
            Method method = clazz.getMethod("getTotalPhysicalMemorySize");
            maxMemory = (Long) method.invoke(operatingSystemMXBean) / 4;
        } catch (Throwable e) {
            throw new RuntimeException("Could not determine the amount of free memory.\n" + "Please set the maximum memory for the JVM, e.g. -Xmx512M for 512 megabytes.");
        }
    }
    return maxMemory - r.totalMemory() + r.freeMemory();
}