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/**
* Copyright (c) 2012-2017, jcabi.com
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met: 1) Redistributions of source code must retain the above
* copyright notice, this list of conditions and the following
* disclaimer. 2) Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials provided
* with the distribution. 3) Neither the name of the jcabi.com nor
* the names of its contributors may be used to endorse or promote
* products derived from this software without specific prior written
* permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT
* NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
* THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package com.jcabi.log;
import java.util.concurrent.Callable;
import lombok.EqualsAndHashCode;
import lombok.ToString;
/**
* Wrapper of {@link Runnable}, that logs all uncaught runtime exceptions.
*
* You can use it with scheduled executor, for example:
*
*
Executors.newScheduledThreadPool(2).scheduleAtFixedRate(
* new VerboseRunnable(runnable, true), 1L, 1L, TimeUnit.SECONDS
* );
*
* Now, every runtime exception that is not caught inside your
* {@link Runnable} will be reported to log (using {@link Logger}).
* Two-arguments constructor can be used when you need to instruct the class
* about what to do with the exception: either swallow it or escalate.
* Sometimes it's very important to swallow exceptions. Otherwise an entire
* thread may get stuck (like in the example above).
*
*
This class is thread-safe.
*
* @author Yegor Bugayenko ([email protected])
* @version $Id: 4dbd69655b73951eb93ce9b6cb4fb64e71c78f1b $
* @since 0.1.3
* @see VerboseThreads
* @link Java theory and practice: Dealing with InterruptedException
*/
@ToString
@EqualsAndHashCode(of = { "origin", "rethrow", "verbose" })
@SuppressWarnings("PMD.DoNotUseThreads")
public final class VerboseRunnable implements Runnable {
/**
* Original runnable.
*/
private final transient Runnable origin;
/**
* Rethrow exceptions (TRUE) or swallow them?
*/
private final transient boolean rethrow;
/**
* Shall we report a full stacktrace?
*/
private final transient boolean verbose;
/**
* Default constructor, doesn't swallow exceptions.
* @param runnable Runnable to wrap
*/
public VerboseRunnable(final Runnable runnable) {
this(runnable, false);
}
/**
* Default constructor, doesn't swallow exceptions.
* @param callable Callable to wrap
* @since 0.7.17
*/
public VerboseRunnable(final Callable callable) {
this(callable, false);
}
/**
* Default constructor, doesn't swallow exceptions.
* @param callable Callable to wrap
* @param swallow Shall we swallow exceptions
* ({@code TRUE}) or re-throw
* ({@code FALSE})? Exception swallowing means that {@link #run()}
* will never throw any exceptions (in any case all exceptions are logged
* using {@link Logger}.
* @since 0.1.10
*/
public VerboseRunnable(final Callable callable, final boolean swallow) {
this(callable, swallow, true);
}
/**
* Default constructor.
* @param callable Callable to wrap
* @param swallow Shall we swallow exceptions
* ({@code TRUE}) or re-throw
* ({@code FALSE})? Exception swallowing means that {@link #run()}
* will never throw any exceptions (in any case all exceptions are logged
* using {@link Logger}.
* @param vrbs Shall we report the entire
* stacktrace of the exception
* ({@code TRUE}) or just its message in one line ({@code FALSE})
* @since 0.7.17
*/
@SuppressWarnings("PMD.AvoidCatchingGenericException")
public VerboseRunnable(final Callable callable,
final boolean swallow, final boolean vrbs) {
this(
new Runnable() {
@Override
public void run() {
try {
callable.call();
} catch (final InterruptedException ex) {
Thread.currentThread().interrupt();
throw new IllegalStateException(ex);
// @checkstyle IllegalCatch (1 line)
} catch (final Exception ex) {
throw new IllegalStateException(ex);
}
}
@Override
public String toString() {
return callable.toString();
}
},
swallow,
vrbs
);
}
/**
* Default constructor, with configurable behavior for exceptions.
* @param runnable Runnable to wrap
* @param swallow Shall we swallow exceptions
* ({@code TRUE}) or re-throw
* ({@code FALSE})? Exception swallowing means that {@link #run()}
* will never throw any exceptions (in any case all exceptions are logged
* using {@link Logger}.
* @since 0.1.4
*/
public VerboseRunnable(final Runnable runnable, final boolean swallow) {
this(runnable, swallow, true);
}
/**
* Default constructor, with fully configurable behavior.
* @param runnable Runnable to wrap
* @param swallow Shall we swallow exceptions
* ({@code TRUE}) or re-throw
* ({@code FALSE})? Exception swallowing means that {@link #run()}
* will never throw any exceptions (in any case all exceptions are logged
* using {@link Logger}.
* @param vrbs Shall we report the entire
* stacktrace of the exception
* ({@code TRUE}) or just its message in one line ({@code FALSE})
* @since 0.7.17
*/
@SuppressWarnings("PMD.BooleanInversion")
public VerboseRunnable(final Runnable runnable,
final boolean swallow, final boolean vrbs) {
this.origin = runnable;
this.rethrow = !swallow;
this.verbose = vrbs;
}
@Override
@SuppressWarnings("PMD.AvoidCatchingGenericException")
public void run() {
try {
this.origin.run();
// @checkstyle IllegalCatch (1 line)
} catch (final RuntimeException ex) {
if (this.rethrow) {
Logger.warn(this, "escalated exception: %s", this.tail(ex));
throw ex;
}
Logger.warn(this, "swallowed exception: %s", this.tail(ex));
// @checkstyle IllegalCatch (1 line)
} catch (final Error error) {
if (this.rethrow) {
Logger.error(this, "escalated error: %s", this.tail(error));
throw error;
}
Logger.error(this, "swallowed error: %s", this.tail(error));
}
if (Thread.currentThread().isInterrupted()) {
Thread.currentThread().interrupt();
throw new IllegalStateException(
"the thread has been interrupted"
);
}
}
/**
* Make a tail of the error/warning message, using the exception thrown.
* @param throwable The exception/error caught
* @return The message to show in logs
*/
private String tail(final Throwable throwable) {
final String tail;
if (this.verbose) {
tail = Logger.format("%[exception]s", throwable);
} else {
tail = Logger.format(
"%[type]s('%s')",
throwable,
throwable.getMessage()
);
}
return tail;
}
}