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/*******************************************************************************
* Copyright (c) 2009, 2014 IBM Corporation and others.
*
* This program and the accompanying materials
* are made available under the terms of the Eclipse Public License 2.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/legal/epl-2.0/
*
* SPDX-License-Identifier: EPL-2.0
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.osgi.service.debug;
/**
* A DebugTrace is used to record debug trace statements, based on the current
* option settings in a corresponding {@link DebugOptions} class. The trace implementation
* will automatically insert additional contextual information such as the bundle, class,
* and method performing the tracing.
*
* Trace statements may be written to a file, or onto standard output, depending on
* how the {@link DebugOptions} is configured (See {@link DebugOptions#setFile(java.io.File)}).
*
*
* All methods on this class have an optional option argument.
* When specified, this argument will cause the tracing to be conditional on the value
* of {@link DebugOptions#getBooleanOption(String, boolean)}, where the bundle's
* symbolic name will automatically be prepended to the provided option string. For example,
* if your bundle symbolic name is "com.acme.bundle", and you provide an option argument
* of "/debug/parser", the trace will only be printed if the option "com.acme.bundle/debug/parser"
* has a value of "true".
*
*
* Note that the pipe character ("|") is reserved for internal use. If this character
* happens to occur in any of the thread name, the option, the message or an Exception
* message, it will be escaped to the corresponding HTML representation ("|").
*
*
* @since 3.5
* @noimplement This interface is not intended to be implemented by clients.
* @noextend This interface is not intended to be extended by clients.
*/
public interface DebugTrace {
/**
* Traces a message for the specified option.
*
* @param option The name of the boolean option that will control whether the
* trace statement is printed (e.g., "/debug/myComponent"), or null
* @param message The trace message to display
*/
public void trace(final String option, final String message);
/**
* Traces a message and exception for the specified option.
*
* @param option The name of the boolean option that will control whether the
* trace statement is printed (e.g., "/debug/myComponent"), or null
* @param message The trace message to display
* @param error The exception to trace
*/
public void trace(final String option, final String message, final Throwable error);
/**
* Adds a trace message showing a thread stack dump for the current class and
* method being executed for the specified option.
*
* @param option The name of the boolean option that will control whether the
* trace statement is printed (e.g., "/debug/myComponent"), or null
*/
public void traceDumpStack(final String option);
/**
* Add a trace message level stating that a method is being executed for the specified option.
*
* @param option The name of the boolean option that will control whether the
* trace statement is printed (e.g., "/debug/myComponent"), or null
*/
public void traceEntry(final String option);
/**
* Add a trace message level stating that a method with the specified argument
* values is being executed for the specified option. The result of {@link String#valueOf(Object)}
* on the methodArgument will be written to the trace file.
*
* @param option The name of the boolean option that will control whether the
* trace statement is printed (e.g., "/debug/myComponent"), or null
* @param methodArgument
* The single argument for the method being executed
*/
public void traceEntry(final String option, final Object methodArgument);
/**
* Add a trace message level stating that a method with the specified arguments
* values is being executed for the specified option. The result of {@link String#valueOf(Object)}
* on each argument will be written to the trace file.
*
* @param option The name of the boolean option that will control whether the
* trace statement is printed (e.g., "/debug/myComponent"), or null
* @param methodArguments
* A list of object arguments for the method being executed
*/
public void traceEntry(final String option, final Object[] methodArguments);
/**
* Add a trace message level stating that a method has completed execution for the specified option.
*
* @param option The name of the boolean option that will control whether the
* trace statement is printed (e.g., "/debug/myComponent"), or null
*/
public void traceExit(final String option);
/**
* Add a trace message level stating that a method with the specified result value
* has completed execution for the specified option. The result of {@link String#valueOf(Object)}
* on the result object will be written to the trace file.
*
* @param option The name of the boolean option that will control whether the
* trace statement is printed (e.g., "/debug/myComponent"), or null
* @param result The result being returned from the method that was executed
*/
public void traceExit(final String option, final Object result);
}