CachedTracer

Abstract tracer that caches recorded traces in memory and periodically dumps them.

Inherits: ITracer, IReconfigurable, IReferenceable

Description

The CachedTracer class allows you to create a tracer that caches the recorded traces in memory and periodically dumps them.

Important points

  • Child classes implement saving cached traces to their specified destinations.

Configuration parameters

  • source: source’s (context) name
  • options:
    • interval: interval in milliseconds to save log messages (default: 10 seconds)
    • max_cache_size: maximum number of messages stored in this cache (default: 100)

References

  • *:context-info:*:*:1.0 - (optional) ContextInfo to detect the context id and specify counters source

Fields

_source

Source’s (context) name

protected _source: string

_cache

List of traces

protected _cache: IList<OperationTrace>

_updated

Boolean variable that indicates whether there has been an update or not.

protected _updated: bool

_lastDumpTime

Time of the last dump

protected _lastDumpTime: long = DateTimeOffset.UtcNow.ToUnixTimeMilliseconds()

_maxCacheSize

Maximum number of messages stored in this cache (default: 100)

protected _maxCacheSize: int = 100

_interval

Interval in milliseconds to save log messages (default: 10 seconds)

protected _interval: long = 10000

Instance methods

BeginTrace

Begins recording an operation trace.

public TraceTiming BeginTrace(IContext context, string component, string operation)

  • context: IContext - (optional) a context to trace execution through a call chain.
  • component: string - name of a called component
  • operation: string - name of the executed operation.
  • return: TraceTiming - trace timing object.

Clear

Clears (removes) all cached log messages.

public void Clear()

Configure

Configures a component by passing its configuration parameters.

public void Configure(ConfigParams config)

  • config: ConfigParams - configuration parameters to be set.

Dump

Dumps (writes) the currently cached log messages.

public void Dump()

Failure

Records an operation failure with its name, duration and error.

public void Failure(IContext context, string component, string operation, Exception error, long duration)

  • context: IContext - (optional) a context to trace execution through a call chain.
  • component: string - name of the called component
  • operation: string - name of the executed operation.
  • error: Exception - error object associated with this trace.
  • duration: long - execution duration in milliseconds.

SetReferences

Sets references to dependent components.

public void SetReferences(IReferences references)

  • references: IReferences - references to locate the component’s dependencies.

Trace

Records an operation trace with its name and duration.

public void Trace(IContext context, string component, string operation, long duration)

  • context: IContext - (optional) a context to trace execution through a call chain.
  • component: string - name of the called component
  • operation: string - name of the executed operation.
  • duration: long - execution duration in milliseconds.

Update

Sets trace cache as updated and dumps it when timeout expires.

protected void Update()

Write

Writes a log message to the logger destination.

protected void Write(IContext context, string component, string operation, Exception error, long duration)

  • context: IContext - (optional) a context to trace execution through a call chain.
  • component: string - name of the called component
  • operation: string - name of the executed operation.
  • error: Exception - error object associated with this trace.
  • duration: long - execution duration in milliseconds.

Abstract methods

Save

Saves log messages from the cache. Throws error if not done.

protected abstract void Save(IList<OperationTrace> messages)

See also