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/*
 * Copyright 2011-2018 the original author or authors.
 *
 * 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.glowroot.agent.impl;

import org.glowroot.agent.shaded.org.checkerframework.checker.nullness.qual.Nullable;

import org.glowroot.agent.bytecode.api.ThreadContextThreadLocal;
import org.glowroot.agent.util.IterableWithSelfRemovableEntries;
import org.glowroot.agent.util.IterableWithSelfRemovableEntries.SelfRemovableEntry;

public class TransactionRegistry {

    // collection of active running transactions
    private final IterableWithSelfRemovableEntries transactions =
            new IterableWithSelfRemovableEntries();

    // active thread context being executed by the current thread
    private final ThreadContextThreadLocal currentThreadContext =
            new ThreadContextThreadLocal();

    @Nullable
    Transaction getCurrentTransaction() {
        ThreadContextImpl threadContext = (ThreadContextImpl) currentThreadContext.get();
        if (threadContext == null) {
            return null;
        }
        return threadContext.getTransaction();
    }

    public ThreadContextThreadLocal.Holder getCurrentThreadContextHolder() {
        return currentThreadContext.getHolder();
    }

    SelfRemovableEntry addTransaction(Transaction transaction) {
        return transactions.add(transaction);
    }

    public Iterable getTransactions() {
        return transactions;
    }
}