Module openj9.dtfj

Package com.ibm.dtfj.image

Interface Image

All Known Subinterfaces:

JCReleasingImage, ManagedImage, ReleasingImage

All Known Implementing Classes:

DTFJImageBean, Image, J9DDRImage, JCImage, PHDImage

public interface Image

Represents an entire operating system image (for example, a core file).

There are methods for accessing information about the architecture of the machine on which the image was running - hardware and operating system. The major feature, however, is the ability to iterate over the Address Spaces contained within the image.

Method Summary

Modifier and Type	Method	Description
void	close()	Close this image and any associated resources.
Iterator	getAddressSpaces()	Get the set of address spaces within the image - typically one but may be more on some systems such as Z/OS.
long	getCreationTime()	Get the time when the image was created
long	getCreationTimeNanos()	Get the value of the JVM's high-resolution timer when the image was created.
String	getHostName()	Get the host name of the system where the image was running.
long	getInstalledMemory()	Get the amount of physical memory (in bytes) installed in the system on which the image was running.
Iterator	getIPAddresses()	The set of IP addresses (as InetAddresses) which the system running the image possessed.
int	getProcessorCount()	Get the number of CPUs running in the system on which the image was running.
String	getProcessorSubType()	Get the precise model of the CPU.
String	getProcessorType()	Get the family name for the processor on which the image was running.
Properties	getProperties()	Gets the OS specific properties for this image.
URI	getSource()	A unique identifier for the source of this image
String	getSystemSubType()	Get the detailed name of the operating system.
String	getSystemType()	Get the family name for the operating system.
default boolean	isTruncated()	Is this image truncated (i.e. incomplete)?

Method Details

getAddressSpaces

Iterator getAddressSpaces()

Get the set of address spaces within the image - typically one but may be more on some systems such as Z/OS.

Returns:

an Iterator which iterates over all of the address spaces described by this Image

See Also:

• ImageAddressSpace
• CorruptData

getProcessorType

String getProcessorType()
                 throws DataUnavailable,
CorruptDataException

Get the family name for the processor on which the image was running.

Returns:

the family name for the processor on which the image was running. This corresponds to the value you would find in the "os.arch" System property.

Throws:

DataUnavailable - if this data cannot be inferred from this core type

CorruptDataException - if expected data cannot be read from the core

getProcessorSubType

String getProcessorSubType()
                    throws DataUnavailable,
CorruptDataException

Get the precise model of the CPU.

Returns:

the precise model of the CPU (note that this can be an empty string but not null).
e.g. getProcessorType() will return x86 where getProcessorSubType() may return Pentium IV step 4

Note that this value is platform and implementation dependent.

Throws:

DataUnavailable

CorruptDataException

getProcessorCount

int getProcessorCount()
               throws DataUnavailable

Get the number of CPUs running in the system on which the image was running.

Returns:

the number of CPUs running in the system on which the image was running

Throws:

DataUnavailable - if the information cannot be provided

getSystemType

String getSystemType()
              throws DataUnavailable,
CorruptDataException

Get the family name for the operating system.

Returns:

the family name for the operating system. This should be the same value that would be returned for the "os.name" system property

Throws:

DataUnavailable - if this data cannot be inferred from this core type

CorruptDataException - if expected data cannot be read from the core

getSystemSubType

String getSystemSubType()
                 throws DataUnavailable,
CorruptDataException

Get the detailed name of the operating system.

Returns:

the detailed name of the operating system, or an empty string if this information is not available (null will never be returned). This should be the same value that would be returned for the "os.version" system property

Throws:

DataUnavailable

CorruptDataException

getInstalledMemory

long getInstalledMemory()
                 throws DataUnavailable

Get the amount of physical memory (in bytes) installed in the system on which the image was running.

Returns:

the amount of physical memory installed in the system on which the image was running. The return value is specified in bytes.

Throws:

DataUnavailable - if the information cannot be provided

getCreationTime

long getCreationTime()
              throws DataUnavailable

Get the time when the image was created

Returns:

the image creation time in milliseconds since 1970

Throws:

DataUnavailable

getHostName

String getHostName()
            throws DataUnavailable,
CorruptDataException

Get the host name of the system where the image was running.

Returns:

The host name of the system where the image was running. This string will be non-null and non-empty

Throws:

DataUnavailable - If the image did not provide this information (would happen if the system did not know its host name or if the image predated this feature).

CorruptDataException

Since:

1.0

getIPAddresses

Iterator getIPAddresses()
                 throws DataUnavailable

The set of IP addresses (as InetAddresses) which the system running the image possessed.

Returns:

An Iterator over the IP addresses (as InetAddresses) which the system running the image possessed. The iterator will be non-null (but can be empty if the host is known to have no IP addresses).

Throws:

DataUnavailable - If the image did not provide this information (would happen if the system failed to look them up or if the image pre-dated this feature).

Since:

1.0

See Also:

• InetAddress
• CorruptData

close

void close()

Close this image and any associated resources.

Some kinds of Image require the generation of temporary resources, for example temporary files created when reading core files and libraries from .zip archives. Ordinarily, these resources are deleted at JVM shutdown, but DTFJ applications may want to free them earlier. This method should only be called when the Image is no longer needed. After this method has been called, any objects associated with the image will be in an invalid state.

Since:

1.4

getProperties

Properties getProperties()

Gets the OS specific properties for this image.

Returns:

a set of OS specific properties

Since:

1.7

getSource

URI getSource()

A unique identifier for the source of this image

Returns:

URI for this image or null if this was not used when the image was created.

Since:

1.10

getCreationTimeNanos

long getCreationTimeNanos()
                   throws DataUnavailable,
CorruptDataException

Get the value of the JVM's high-resolution timer when the image was created.

Returns:

the value of the high-resolution timer, in nanoseconds

Throws:

DataUnavailable - if the image creation time is not available

CorruptDataException - if the image creation time is corrupted

Since:

1.12

isTruncated

default boolean isTruncated()

Is this image truncated (i.e. incomplete)?