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Efficient reliable UDP unicast, UDP multicast, and IPC transport protocol.
/*
* Copyright 2014-2017 Real Logic Ltd.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package io.aeron;
import org.agrona.IoUtil;
import org.agrona.LangUtil;
import org.agrona.concurrent.AtomicBuffer;
import org.agrona.concurrent.UnsafeBuffer;
import org.agrona.concurrent.errors.ErrorLogReader;
import org.agrona.concurrent.ringbuffer.ManyToOneRingBuffer;
import java.io.File;
import java.io.PrintStream;
import java.nio.MappedByteBuffer;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.UUID;
import java.util.function.Consumer;
import static io.aeron.CncFileDescriptor.CNC_VERSION;
import static java.lang.System.getProperty;
/**
* This class provides the Media Driver and client with common configuration for the Aeron directory.
*
* This class should have {@link #conclude()} called before the methods are used or at least
* {@link #concludeAeronDirectory()} to avoid NPEs.
*
* Properties
*
* aeron.dir: Use value as directory name for Aeron buffers and status.
*/
public class CommonContext implements AutoCloseable
{
/**
* The top level Aeron directory used for communication between a Media Driver and client.
*/
public static final String AERON_DIR_PROP_NAME = "aeron.dir";
/**
* The value of the top level Aeron directory unless overridden by {@link #aeronDirectoryName(String)}
*/
public static final String AERON_DIR_PROP_DEFAULT;
/**
* URI used for IPC {@link Publication}s and {@link Subscription}s
*/
public static final String IPC_CHANNEL = "aeron:ipc";
/**
* URI used for Spy {@link Subscription}s whereby an outgoing unicast or multicast publication can be spied on
* by IPC without receiving it again via the network.
*/
public static final String SPY_PREFIX = "aeron-spy:";
/**
* Timeout in which the driver is expected to respond.
*/
public static final long DEFAULT_DRIVER_TIMEOUT_MS = 10_000;
/**
* Initial term id to be used when creating an {@link ExclusivePublication}.
*/
public static final String INITIAL_TERM_ID_PARAM_NAME = "init-term-id";
/**
* Current term id to be used when creating an {@link ExclusivePublication}.
*/
public static final String TERM_ID_PARAM_NAME = "term-id";
/**
* Current term offset to be used when creating an {@link ExclusivePublication}.
*/
public static final String TERM_OFFSET_PARAM_NAME = "term-offset";
/**
* The param name to be used for the term length as a channel URI param.
*/
public static final String TERM_LENGTH_PARAM_NAME = "term-length";
/**
* MTU length parameter name for using as a channel URI param.
*/
public static final String MTU_LENGTH_URI_PARAM_NAME = "mtu";
/**
* Key for the mode of control that such be used for multi-destination-cast semantics.
*/
public static final String MDC_CONTROL_MODE = "control-mode";
/**
* Valid value for {@link #MDC_CONTROL_MODE} when manual control is desired.
*/
public static final String MDC_CONTROL_MODE_MANUAL = "manual";
/**
* Parameter name for channel URI param to indicate if a subscribed must be reliable or not. Value is boolean.
*/
public static final String RELIABLE_STREAM_PARAM_NAME = "reliable";
private long driverTimeoutMs = DEFAULT_DRIVER_TIMEOUT_MS;
private String aeronDirectoryName;
private File aeronDirectory;
private File cncFile;
private UnsafeBuffer countersMetaDataBuffer;
private UnsafeBuffer countersValuesBuffer;
static
{
String baseDirName = IoUtil.tmpDirName() + "aeron";
// Use shared memory on Linux to avoid contention on the page cache.
if ("Linux".equalsIgnoreCase(System.getProperty("os.name")))
{
final File devShmDir = new File("/dev/shm");
if (devShmDir.exists())
{
baseDirName = "/dev/shm/aeron";
}
}
AERON_DIR_PROP_DEFAULT = baseDirName + "-" + System.getProperty("user.name", "default");
}
/**
* Convert the default Aeron directory name to be a random name for use with embedded drivers.
*
* @return random directory name with default directory name as base
*/
public static String generateRandomDirName()
{
final String randomDirName = UUID.randomUUID().toString();
return AERON_DIR_PROP_DEFAULT + "-" + randomDirName;
}
/**
* Create a new context with Aeron directory and delete on exit values based on the current system properties.
*/
public CommonContext()
{
aeronDirectoryName = getProperty(AERON_DIR_PROP_NAME, AERON_DIR_PROP_DEFAULT);
}
/**
* This completes initialization of the CommonContext object. It is automatically called by subclasses.
*
* @return this Object for method chaining.
*/
public CommonContext conclude()
{
concludeAeronDirectory();
cncFile = new File(aeronDirectory, CncFileDescriptor.CNC_FILE);
return this;
}
/**
* Conclude the {@link #aeronDirectory()} so it does not need to keep being recreated.
*
* @return this for a fluent API.
*/
public CommonContext concludeAeronDirectory()
{
if (null == aeronDirectory)
{
aeronDirectory = new File(aeronDirectoryName);
}
return this;
}
/**
* Get the top level Aeron directory used for communication between the client and Media Driver, and
* the location of the data buffers.
*
* @return The top level Aeron directory.
*/
public String aeronDirectoryName()
{
return aeronDirectoryName;
}
/**
* Get the directory in which the aeron config files are stored.
*
* This is valid after a call to {@link #conclude()}.
*
* @return the directory in which the aeron config files are stored.
*
* @see #aeronDirectoryName()
*/
public File aeronDirectory()
{
return aeronDirectory;
}
/**
* Set the top level Aeron directory used for communication between the client and Media Driver, and the location
* of the data buffers.
*
* @param dirName New top level Aeron directory.
* @return this Object for method chaining.
*/
public CommonContext aeronDirectoryName(final String dirName)
{
this.aeronDirectoryName = dirName;
return this;
}
/**
* Create a new command and control file in the administration directory.
*
* @return The newly created File.
*/
public static File newDefaultCncFile()
{
return new File(getProperty(AERON_DIR_PROP_NAME, AERON_DIR_PROP_DEFAULT), CncFileDescriptor.CNC_FILE);
}
/**
* Get the buffer containing the counter meta data.
*
* @return The buffer storing the counter meta data.
*/
public UnsafeBuffer countersMetaDataBuffer()
{
return countersMetaDataBuffer;
}
/**
* Set the buffer containing the counter meta data.
*
* @param countersMetaDataBuffer The new counter meta data buffer.
* @return this Object for method chaining.
*/
public CommonContext countersMetaDataBuffer(final UnsafeBuffer countersMetaDataBuffer)
{
this.countersMetaDataBuffer = countersMetaDataBuffer;
return this;
}
/**
* Get the buffer containing the counters.
*
* @return The buffer storing the counters.
*/
public UnsafeBuffer countersValuesBuffer()
{
return countersValuesBuffer;
}
/**
* Set the buffer containing the counters
*
* @param countersValuesBuffer The new counters buffer.
* @return this Object for method chaining.
*/
public CommonContext countersValuesBuffer(final UnsafeBuffer countersValuesBuffer)
{
this.countersValuesBuffer = countersValuesBuffer;
return this;
}
/**
* Get the command and control file.
*
* @return The command and control file.
*/
public File cncFile()
{
return cncFile;
}
/**
* Set the driver timeout in milliseconds
*
* @param driverTimeoutMs to indicate liveness of driver
* @return driver timeout in milliseconds
*/
public CommonContext driverTimeoutMs(final long driverTimeoutMs)
{
this.driverTimeoutMs = driverTimeoutMs;
return this;
}
/**
* Get the driver timeout in milliseconds.
*
* @return driver timeout in milliseconds.
*/
public long driverTimeoutMs()
{
return driverTimeoutMs;
}
/**
* Delete the current Aeron directory, throwing errors if not possible.
*/
public void deleteAeronDirectory()
{
IoUtil.delete(aeronDirectory, false);
}
/**
* Is a media driver active in the current Aeron directory?
*
* @param driverTimeoutMs for the driver liveness check
* @param logHandler for feedback as liveness checked
* @return true if a driver is active or false if not
*/
public boolean isDriverActive(final long driverTimeoutMs, final Consumer logHandler)
{
if (aeronDirectory.exists() && aeronDirectory.isDirectory())
{
final File cncFile = new File(aeronDirectory, CncFileDescriptor.CNC_FILE);
logHandler.accept("INFO: Aeron directory " + aeronDirectory + " exists");
if (cncFile.exists())
{
MappedByteBuffer cncByteBuffer = null;
logHandler.accept("INFO: Aeron CnC file " + cncFile + " exists");
try
{
cncByteBuffer = IoUtil.mapExistingFile(cncFile, CncFileDescriptor.CNC_FILE);
final UnsafeBuffer cncMetaDataBuffer = CncFileDescriptor.createMetaDataBuffer(cncByteBuffer);
final int cncVersion = cncMetaDataBuffer.getInt(CncFileDescriptor.cncVersionOffset(0));
if (CNC_VERSION != cncVersion)
{
throw new IllegalStateException(
"Aeron CnC version does not match: version=" + cncVersion + " required=" + CNC_VERSION);
}
final ManyToOneRingBuffer toDriverBuffer = new ManyToOneRingBuffer(
CncFileDescriptor.createToDriverBuffer(cncByteBuffer, cncMetaDataBuffer));
final long timestamp = toDriverBuffer.consumerHeartbeatTime();
final long now = System.currentTimeMillis();
final long diff = now - timestamp;
logHandler.accept("INFO: Aeron toDriver consumer heartbeat is " + diff + "ms old");
if (diff <= driverTimeoutMs)
{
return true;
}
}
catch (final Exception ex)
{
LangUtil.rethrowUnchecked(ex);
}
finally
{
IoUtil.unmap(cncByteBuffer);
}
}
}
return false;
}
/**
* Read the error log to a given {@link PrintStream}
*
* @param out to write the error log contents to.
* @return the number of observations from the error log
*/
public int saveErrorLog(final PrintStream out)
{
int distinctErrorCount = 0;
if (aeronDirectory.exists() && aeronDirectory.isDirectory())
{
final File cncFile = new File(aeronDirectory, CncFileDescriptor.CNC_FILE);
if (cncFile.exists())
{
MappedByteBuffer cncByteBuffer = null;
try
{
cncByteBuffer = IoUtil.mapExistingFile(cncFile, CncFileDescriptor.CNC_FILE);
final UnsafeBuffer cncMetaDataBuffer = CncFileDescriptor.createMetaDataBuffer(cncByteBuffer);
final int cncVersion = cncMetaDataBuffer.getInt(CncFileDescriptor.cncVersionOffset(0));
if (CNC_VERSION != cncVersion)
{
throw new IllegalStateException(
"Aeron CnC version does not match: version=" + cncVersion + " required=" + CNC_VERSION);
}
final AtomicBuffer buffer = CncFileDescriptor.createErrorLogBuffer(
cncByteBuffer, cncMetaDataBuffer);
final SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss.SSSZ");
distinctErrorCount = ErrorLogReader.read(
buffer,
(observationCount, firstObservationTimestamp, lastObservationTimestamp, encodedException) ->
out.format(
"***%n%d observations from %s to %s for:%n %s%n",
observationCount,
dateFormat.format(new Date(firstObservationTimestamp)),
dateFormat.format(new Date(lastObservationTimestamp)),
encodedException));
out.format("%n%d distinct errors observed.%n", distinctErrorCount);
}
catch (final Exception ex)
{
LangUtil.rethrowUnchecked(ex);
}
finally
{
IoUtil.unmap(cncByteBuffer);
}
}
}
return distinctErrorCount;
}
/**
* Release resources used by the CommonContext.
*/
public void close()
{
}
}
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