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Standard interfaces for running applications as a heavyweight process
/**
* Copyright © 2019 admin ([email protected])
*
* 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 org.infrastructurebuilder.util;
import static java.lang.Thread.sleep;
import static java.nio.file.Files.createDirectories;
import static java.nio.file.Files.exists;
import static java.time.Duration.ZERO;
import static java.time.Duration.between;
import static java.time.Instant.now;
import static java.util.Objects.requireNonNull;
import static java.util.Optional.empty;
import static java.util.Optional.ofNullable;
import static org.infrastructurebuilder.util.IBUtils.deletePath;
import static org.infrastructurebuilder.util.ProcessException.pet;
import static org.infrastructurebuilder.util.ProcessExecution.VERY_LONG;
import java.io.IOException;
import java.io.PrintStream;
import java.nio.file.Path;
import java.time.Duration;
import java.time.Instant;
import java.time.temporal.ChronoUnit;
import java.util.HashSet;
import java.util.Map;
import java.util.Optional;
import java.util.Set;
import java.util.Vector;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.Future;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;
import java.util.concurrent.atomic.AtomicReference;
import java.util.function.Supplier;
//import org.infrastructurebuilder.util.execution.model.v1_0_0.DefaultProcessExecution;
import org.slf4j.Logger;
import org.slf4j.helpers.NOPLoggerFactory;
import org.zeroturnaround.exec.InvalidExitValueException;
import org.zeroturnaround.exec.ProcessExecutor;
import org.zeroturnaround.exec.ProcessResult;
import org.zeroturnaround.exec.StartedProcess;
public class DefaultProcessRunner implements ProcessRunner {
private final Optional addl;
private boolean keepScratchDir = false;
private final Logger logger;
private final AtomicReference>> locked = new AtomicReference<>(null);
private final AtomicReference result = new AtomicReference<>(null);
private final Path scratchDir;
private final Vector serialList = new Vector<>();
public DefaultProcessRunner(final Path scratchDir, final Optional addl) {
this(scratchDir, addl, empty(), empty());
}
public DefaultProcessRunner(final Path scratchDir, final Optional addl, final Optional logger) {
this(scratchDir, addl, logger, empty(), Optional.of(new Long(100L)));
}
public DefaultProcessRunner(final Path scratchDir, final Optional addl, final Optional logger,
final Optional relativeRoot) {
this(scratchDir, addl, logger, relativeRoot, Optional.of(new Long(100L)));
}
public DefaultProcessRunner(final Path scratchDir, final Optional addl, final Optional logger,
final Optional relativeRoot, final Optional iterimSleepValue) {
this.scratchDir = requireNonNull(scratchDir);
if (exists(this.scratchDir))
throw new ProcessException("Scratch directory must not exist -> " + this.scratchDir);
pet.withTranslation(() -> {
createDirectories(scratchDir);
});
this.addl = requireNonNull(addl);
this.logger = requireNonNull(logger)
.orElse(new NOPLoggerFactory().getLogger(DefaultProcessRunner.class.toString()));
}
@Override
public DefaultProcessRunner add(final Supplier e) {
if (locked.get() != null)
throw new ProcessException("Already locked");
serialList.add(requireNonNull(e.get()));
return this;
}
@Override
public void close() throws Exception {
if (!isKeepScratchDir()) {
deletePath(scratchDir);
}
}
@Override
public Optional get() {
return ofNullable(result.get());
}
@Override
public Optional getAddl() {
return addl;
}
@Override
public Logger getLogger() {
return logger;
}
@Override
public Optional getProcessExecutionForId(final String id) {
requireNonNull(id);
return serialList.stream().filter(pe -> pe.getId().equals(id)).findFirst();
}
@Override
public final boolean hasErrorResult(final Map resultMap) {
for (final ProcessExecutionResult res : resultMap.values()) {
final Optional resultCode = res.getResultCode();
if (!res.getStdErr().toString().isEmpty()) {
getLogger().error(res.getStdErr().toString());
}
getLogger().info(res.getStdOut().toString());
if (!resultCode.isPresent() || resultCode.get() != 0) {
getLogger().error(String.format("Result code %s differed from expected result 0", resultCode.toString()));
return true;
}
}
return false;
}
@Override
public boolean isKeepScratchDir() {
return keepScratchDir;
}
@Override
public DefaultProcessRunner lock() {
return lock(ZERO, empty());
}
@Override
public DefaultProcessRunner lock(final Duration fin, final Optional sleepAfterDestroy) {
synchronized (locked) {
if (locked.get() != null)
return this;
else {
if (requireNonNull(fin).isNegative())
throw new ProcessException("Final duration cannot be negative " + fin);
final Instant startedLock = now();
final Instant endLock = startedLock.plus(fin.equals(ZERO) ? VERY_LONG : fin);
locked.compareAndSet(null, new HashSet>());
final MutableProcessExecutionResultBag bag = new MutableProcessExecutionResultBag();
for (final ProcessExecution pe : serialList) {
ProcessExecutor pExecutor;
pExecutor = pe.getProcessExecutor().addListener(bag);
bag.addExecution(pe, pExecutor);
try {
final StartedProcess s = pExecutor.start();
final Future future = s.getFuture();
bag.addProcess(pe, s.getProcess());
if (pe.isBackground()) {
bag.addFuture(pe, future);
} else {
final ProcessResult res = pe.getTimeout().isPresent()
? future.get(pe.getTimeout().get().get(ChronoUnit.SECONDS), TimeUnit.SECONDS)
: future.get();
bag.afterFinish(s.getProcess(), res);
}
} catch (InvalidExitValueException | TimeoutException | ExecutionException | InterruptedException
| IOException te) {
bag.setException(pe, te);
}
}
if (!fin.isZero()) {
Duration dur = between(now(), endLock);
while (bag.stillRunning() && dur.toNanos() > 0) {
pet.withTranslation(() -> sleep(100L));
dur = between(now(), endLock);
}
if (bag.stillRunning())
if (bag.destroyRemainingSleepers(sleepAfterDestroy)) {
logger.warn("Failed to destroy some sleeping processes. YMMV.");
}
}
result.set(bag.lock());
return this;
}
}
}
@Override
public ProcessRunner setKeepScratchDir(final boolean keepScratchDir) {
this.keepScratchDir = keepScratchDir;
return this;
}
}