/
Ctx.java
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/
Ctx.java
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package org.rapidoid.ctx;
import org.rapidoid.RapidoidThing;
import org.rapidoid.annotation.Authors;
import org.rapidoid.annotation.Since;
import org.rapidoid.collection.Coll;
import org.rapidoid.log.Log;
import java.util.*;
import java.util.concurrent.atomic.AtomicLong;
/*
* #%L
* rapidoid-commons
* %%
* Copyright (C) 2014 - 2017 Nikolche Mihajlovski and contributors
* %%
* 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.
* #L%
*/
@Authors("Nikolche Mihajlovski")
@Since("2.0.0")
public class Ctx extends RapidoidThing implements CtxMetadata {
private static final AtomicLong ID_COUNTER = new AtomicLong();
private final long id = ID_COUNTER.incrementAndGet();
private final String tag;
private volatile int referenceCounter = 1;
private volatile UserInfo user;
private volatile Object exchange;
private volatile boolean closed = false;
private volatile ThreadLocal<Object> persisters = new ThreadLocal<Object>();
private final List<Object> persistersToClose = Collections.synchronizedList(new LinkedList<Object>());
private final Map<Object, Object> extras = Coll.synchronizedMap();
Ctx(String tag) {
this.tag = tag;
}
public UserInfo user() {
ensureNotClosed();
return user;
}
public void setUser(UserInfo user) {
ensureNotClosed();
this.user = user;
}
@SuppressWarnings("unchecked")
public <T> T exchange() {
ensureNotClosed();
return (T) exchange;
}
public void setExchange(Object exchange) {
ensureNotClosed();
this.exchange = exchange;
}
@SuppressWarnings("unchecked")
public synchronized <P> P persister() {
ensureNotClosed();
Object persister = this.persisters.get();
if (persister == null) {
persister = Ctxs.createPersister(this);
this.persisters.set(persister);
persistersToClose.add(persister);
}
return (P) persister;
}
public synchronized void setPersister(Object persister) {
this.persisters.set(persister);
}
public synchronized Ctx span() {
ensureNotClosed();
referenceCounter++;
Log.debug("Spanning context", "ctx", this);
return this;
}
synchronized void close() {
ensureNotClosed();
Log.debug("Closing context", "ctx", this);
referenceCounter--;
if (referenceCounter == 0) {
clear();
} else if (referenceCounter < 0) {
throw new IllegalStateException("Reference counter < 0 for context: " + this);
}
}
private synchronized void clear() {
ensureNotClosed();
Log.debug("Clearing context", "ctx", this);
this.referenceCounter = 0;
this.user = null;
this.exchange = null;
this.persisters = null;
for (Object persister : persistersToClose) {
Ctxs.closePersister(this, persister);
}
persistersToClose.clear();
extras.clear();
closed = true;
}
private void ensureNotClosed() {
if (closed) {
throw new RuntimeException("The context is closed!");
}
}
@Override
public String toString() {
final int maxLen = 10;
return prefixed("Ctx [id=" + id + ", tag=" + tag + ", user=" + user + ", exchange=" + exchange
+ ", referenceCounter=" + referenceCounter + ", closed=" + closed
+ ", persistersToClose=" + toString(persistersToClose, maxLen) + ", extras="
+ toString(extras.entrySet(), maxLen) + "]");
}
private String prefixed(String asStr) {
String isClosed = closed ? " <CLOSED>" : "";
String prefix = "Ctx#" + id + ":" + tag + isClosed;
return prefix + " " + asStr;
}
private String toString(Collection<?> collection, int maxLen) {
StringBuilder builder = new StringBuilder();
builder.append("[");
int i = 0;
for (Iterator<?> iterator = collection.iterator(); iterator.hasNext() && i < maxLen; i++) {
if (i > 0)
builder.append(", ");
builder.append(iterator.next());
}
builder.append("]");
return builder.toString();
}
public boolean isClosed() {
return closed;
}
public Map<Object, Object> extras() {
ensureNotClosed();
return extras;
}
public String tag() {
return tag;
}
}